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Start on Cloud

A unified distributed database ready for your transactional, analytical, and AI workloads.

DEPLOY YOUR WAY

OceanBase Cloud

The best way to deploy and scale OceanBase

OceanBase Enterprise

Run and manage OceanBase on your infra

TRY OPEN SOURCE

OceanBase Community Edition

The free, open-source distributed database

OceanBase seekdb

Open source AI native search database

Customer Stories

Real-world success stories from enterprises across diverse industries.

View All
BY USE CASES

Mission-Critical Transactions

Global & Multicloud Application

Elastic Scaling for Peak Traffic

Real-time Analytics

Active Geo-redundancy

Database Consolidation

Comprehensive knowledge hub for OceanBase.

Blog

Live Demos

Training & Certification

Documentation

Official technical guides, tutorials, API references, and manuals for all OceanBase products.

View All
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QUICK START
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OceanBase Database

SQL - V4.2.0

  • What is OceanBase Database
    • Overview
    • Differences between the Enterprise Edition and the Community Edition
    • System architecture
    • Compatibility with Oracle
      • Overview
      • SQL data types
      • Built-in functions
      • System views
    • Compatibility with MySQL
    • Limitations
  • Get Started
    • Get started with OceanBase Database
    • Learn OceanBase SQL
      • Before you begin
      • Basic SQL operations (MySQL mode)
      • Basic SQL operations (Oracle mode)
    • Build a sample application (MySQL mode)
      • Build a Python application
      • Build a Java application
      • Build a C application
      • Build a Go application
    • Build a sample application (Oracle mode)
      • Build a Java application
      • Build a C application
    • Try out advanced features of OceanBase Database
      • Scalable OLTP
        • Run the TPC-C benchmark in OceanBase Database
        • Try out the hot row update capability of OceanBase Database
      • Try out operational OLAP
      • Try out parallel import and data compression
      • Try out the multi-tenant feature
    • Video tutorials
  • Develop
    • Develop applications in MySQL mode
      • Connect to OceanBase Database
        • Overview
        • Connect to an OceanBase Database tenant by using the mysql client
        • Connect to an OceanBase Database tenant by using OBClient
        • Connect to OceanBase Database by using ODC
        • Connect to OceanBase Database by using Spring Boot
        • Connect to OceanBase Database by using Spring Batch
        • Connect to OceanBase Database by using Spring JDBC
        • Connect to OceanBase Database by using Spring Data JPA
        • Connect to OceanBase Database by using Hibernate
        • Connect to OceanBase Database by using MyBatis
        • Use database connection pool
          • Database connection pool configuration
          • Configure a Tomcat connection pool
          • Configure a C3P0 connection pool
          • Configure a Proxool connection pool
          • Configure a HiKariCP connection pool
          • Configure a DBCP connection pool
          • Configure a CommonPool connection pool
      • Sample applications
        • Python
          • mysqlclient
          • PyMySQL
      • Plan database objects
        • Create a database
        • Create a table group
        • Create a table
        • Create an index
        • Create an external table
      • Write data
        • Insert data
        • Update data
        • Delete data
        • Replace data
      • Read data
        • Single-table queries
        • Join tables
          • INNER JOIN queries
          • FULL JOIN queries
          • LEFT JOIN queries
          • RIGHT JOIN queries
          • Subqueries
        • Use operators and functions in queries
          • Use arithmetic operators in queries
          • Use numerical functions in queries
          • Use string concatenation operators in queries
          • Use string functions in queries
          • Use datetime functions in queries
          • Use type conversion functions in queries
          • Use aggregate functions in queries
          • Use NULL-related functions in queries
          • Use the CASE conditional operator in queries
          • Use the SELECT ... FOR UPDATE statement to lock query results
          • Use the SELECT ... LOCK IN SHARE MODE statement to lock query results
        • Use a DBLink in queries
        • Set operations
      • Transactions
        • Overview
        • Start a transaction
        • Savepoints
          • Mark a savepoint
          • Roll back a transaction to a savepoint
          • Release a savepoint
        • Commit a transaction
        • Roll back a transaction
      • Application errors
        • Troubleshooting guidelines
          • About error codes
          • Error handling specifications for MySQL-compatible applications
        • Common errors and troubleshooting practices
          • Disconnected from the server, with ERROR 2013 reported
          • Idle transaction timed out, with ERROR 6002 reported
          • Transaction timed out, with ERROR 4012 reported
          • User locked, with ERROR 3118 reported
          • Incorrect user password, with ERROR 1045 reported
          • Table already exists, with ERROR 1050 reported
          • Table does not exist, with ERROR 1146 reported
          • Duplicate data inserted, with ERROR 1062 reported
          • ERROR 1215 reported in foreign key addition
          • Data truncated while being inserted, with ERROR 1265 reported
    • Develop applications in Oracle mode
      • Connect to OceanBase Database
        • Overview
        • Connect to an OceanBase Database tenant by using OBClient
        • Connect to OceanBase Database by using ODC
        • Connect to OceanBase Database by using Spring Boot
        • Connect to OceanBase Database by using Spring Batch
        • Connect to OceanBase Database by using Spring JDBC
        • Connect to OceanBase Database by using Spring Data JPA
        • Connect to OceanBase Database by using Hibernate
        • Connect to OceanBase Database by using MyBatis
        • Use database connection pool
          • Database connection pool configuration
          • Configure a Tomcat connection pool
          • Configure a C3P0 connection pool
          • Configure a Proxool connection pool
          • Configure a HiKariCP connection pool
          • Configure a DBCP connection pool
          • Configure a CommonPool connection pool
          • Configure a JDBC connection pool
      • Sample applications
        • Java
          • OceanBase Connector/J
      • Plan database objects
        • Create a table group
        • Create a table
        • Create an index
        • Create an external table
      • Write data
        • Insert data
        • Update data
        • Delete data
        • Replace data
      • Read data
        • Single-table queries
        • Join tables
          • INNER JOIN queries
          • FULL JOIN queries
          • LEFT JOIN queries
          • RIGHT JOIN queries
          • Subqueries
        • Use operators and functions in queries
          • Use arithmetic operators in queries
          • Use numerical functions in queries
          • Use string concatenation operators in queries
          • Use string functions in queries
          • Use datetime functions in queries
          • Use type conversion functions in queries
          • Use aggregate functions in queries
          • Use NULL-related functions in queries
          • Use CASE functions in queries
          • Use the SELECT ... FOR UPDATE statement to lock query results
        • Use a DBLink in queries
        • Set operations
      • Transactions
        • Overview
        • Start a transaction
        • Savepoints
          • Mark a savepoint
          • Roll back a transaction to a savepoint
        • Commit a transaction
        • Roll back a transaction
      • Application errors
        • Troubleshooting guidelines
          • About error codes
          • Error handling specifications for Oracle-compatible applications
        • Common errors and troubleshooting practices
          • Idle transaction timed out, with Error ORA-24761 reported
          • Transaction timed out, with Error ORA-00600 reported
          • User locked, with ERROR 3118 reported
          • Incorrect user password, with ERROR 1045 reported
          • Table already exists, with Error ORA-00955 reported
          • Table does not exist, with Error ORA-04043 reported
          • Duplicate data inserted, with Error ORA-00001 reported
          • Error ORA-00600 reported in foreign key addition
          • Inconsistent data types, with Error ORA-00932 reported
  • Deploy
    • Overview
    • High availability deployment solutions for OceanBase clusters
    • Deploy OceanBase Database Enterprise Edition
      • Deployment process
      • Before deployment
        • Prepare servers
        • Server configuration
        • Prepare installation packages
        • Deploy OAT
      • Deploy through GUI
        • Configure deployment environment using OAT
          • Add a server
        • Deploy OCP
          • Overview
          • Upload installation packages
          • Create MetaDB
          • Deploy OCP
        • Deploy OceanBase clusters using OCP
          • Add a server to the resource pool
          • Deploy a two-replica OceanBase cluster with the arbitration service by using OCP
          • Deploy a single-replica OceanBase cluster by using OCP
          • Deploy a three-replica OceanBase cluster by using OCP
        • (Optional) Deploy ODP
      • Deploy through CLI
        • Configure deployment environment
          • Initialize an OBServer node by using oatcli
          • (Optional) Configure the clock source
        • Deploy OceanBase clusters using CLI
          • Deploy an OceanBase cluster with two replicas and an arbitration service using the CLI
          • Deploy a single-replica OceanBase cluster using the CLI
          • Deploy a three-replica OceanBase cluster using the CLI
        • (Optional) Deploy ODP
    • Deploy OceanBase Database Community Edition
      • Overview
      • Deploy locally
        • Software and hardware requirements
        • Before deployment
          • (Optional) Check resources
          • (Optional) Set password-free SSH logon
          • (Optional) Configure the clock source
          • (Optional) Perform disk planning
          • (Optional) Configure limits.conf
          • (Optional) Configure sysctl.conf
          • (Optional) Disable the firewall and SELinux
          • (Optional) Create a user
        • Deploy through GUI
          • Deploy an OceanBase cluster through the GUI of OBD
          • Deploy an OceanBase cluster through the GUI of OCP
        • Deploy OceanBase Database in a production environment by using the CLI
      • Deploy OceanBase Database in a Kubernetes cluster
    • Clear out an old cluster
  • Migrate
    • Overview
    • Migrate from MySQL databases to OceanBase Database
      • Use OMS to migrate data from a MySQL database to a MySQL tenant of OceanBase Database
      • Use mydumper and myloader to migrate data from a MySQL database to OceanBase Database
      • Use DBCAT to migrate schemas from a MySQL database to OceanBase Database
      • Use DataX to migrate table data from a MySQL database to OceanBase Database
      • Use CloudCanal to migrate data from a MySQL database to OceanBase Database
      • Use Canal to synchronize data from a MySQL database to OceanBase Database
      • Use Flink CDC to synchronize data from a MySQL database to OceanBase Database
      • Use ChunJun to migrate data from a MySQL database to OceanBase Database
    • Migrate from OceanBase Database to MySQL databases
      • Use OMS to migrate data from a MySQL tenant of OceanBase Database to a MySQL database
      • Use OMS to migrate incremental data from an Oracle tenant of OceanBase Database to a MySQL database
      • Use DBCAT to migrate schemas from OceanBase Database to a MySQL database
      • Use DataX to migrate table data from OceanBase Database to a MySQL database
      • Synchronize data from OceanBase Database to a MySQL database using Canal
      • Migrate data from a MySQL OceanBase database to a MySQL database using CloudCanal
      • Use Flink CDC to migrate data from OceanBase Database to a MySQL database
      • Migrate data from a MySQL database in OceanBase Database to a MySQL database using ChunJun
    • Migrate from Oracle databases to OceanBase Database
      • Use OMS to migrate data from an Oracle database to a MySQL tenant of OceanBase Database
      • Use OMS to migrate data from an Oracle database to an Oracle tenant of OceanBase Database
      • Use DBCAT to migrate schemas from an Oracle database to OceanBase Database
      • Use DataX to migrate table data from an Oracle database to OceanBase Database
    • Migrate from OceanBase Database to Oracle databases
      • Use OMS to migrate data from an Oracle tenant of OceanBase Database to an Oracle database
      • Use DBCAT to migrate schemas from OceanBase Database to an Oracle database
      • Use DataX to migrate table data from OceanBase Database to an Oracle database
    • Migrate from DB2 databases to OceanBase Database
      • Use OMS to migrate data from a DB2 LUW database to a MySQL tenant of OceanBase Database
      • Use OMS to migrate data from a DB2 LUW database to an Oracle tenant of OceanBase Database
      • Use DBCAT to migrate table schemas from a DB2 LUW database to OceanBase Database
    • Migrate from OceanBase Database to DB2 databases
      • Use OMS to migrate data from a MySQL tenant of OceanBase Database to a DB2 LUW database
      • Use OMS to migrate data from an Oracle tenant of OceanBase Database to a DB2 LUW database
    • Migrate from TiDB databases to OceanBase Database
      • Use OMS to migrate data from a TiDB database to a MySQL tenant of OceanBase Database
    • Migrate from PostgreSQL databases to OceanBase Database
      • Use OMS to migrate data from a PostgreSQL database to a MySQL tenant of OceanBase Database
    • Migrate from CSV files to OceanBase Database
      • Use DataX to migrate CSV files to OceanBase Database
      • Import data by using the LOAD DATA statement
    • Import data from SQL files to OceanBase Database
    • Migrate data between OceanBase Database
      • Use OMS to migrate data from an OceanBase Database tenant to another of the same type
      • Use OMS to migrate data from an OceanBase Database tenant to another of the same type in active-active disaster recovery scenarios
      • Use OBLOADER & OBDUMPER to migrate data between MySQL tenants in OceanBase Database
      • Use OBLOADER & OBDUMPER to migrate data from a MySQL tenant to an Oracle tenant in OceanBase Database
      • Use OBLOADER & OBDUMPER to migrate data between Oracle tenants in OceanBase Database
      • Use OBLOADER & OBDUMPER to migrate data from an Oracle tenant to a MySQL tenant in OceanBase Database
    • Migrate data using SQL statements
      • Migrate data between tables
      • Migrate resource units
      • Export data by using OUTFILE statements
    • Bypass import
      • Overview of direct load
      • Import data in bypass mode by using the LOAD DATA statement
      • Import data in bypass mode by using the INSERT INTO SELECT statement
  • Manage
    • Log on to an OceanBase Database tenant
    • Manage clusters
      • Overview
      • Cluster parameters
      • Common cluster operations
        • View a zone
        • View a node
        • Restart a node
        • Add a node
        • Delete a node
        • Isolate a node
        • Replace a node
        • Start a zone
        • Add a zone
        • Delete a zone
        • Modify a zone
        • Isolate a zone
        • View cluster parameters
        • Modify cluster parameters
        • Upgrade clusters
          • Upgrade OceanBase Database Enterprise Edition
            • Overview
            • Upgrade the arbitration service
            • Upgrade an OceanBase cluster
            • Check upgrade results
          • Upgrade OceanBase Database Community Edition
            • Upgrade OceanBase Database by using OBD
      • Troubleshoot common problems
        • Failures of a minority of nodes
        • Failures of the majority of nodes
    • Manage tenants
      • Tenants
      • Tenant capacity
      • Tenant types
      • User tenants
      • System variables of a tenant
      • Common tenant operations
        • Create a tenant
        • Resource isolation
          • Overview
          • Manage resource isolation (Oracle mode)
            • Configure cgroups
            • Calibrate the disk performance
            • Configure user-level resource isolation
            • Configure SQL statement-level resource isolation
            • Update a resource management plan config
            • Delete a resource management plan config
            • Delete a resource management plan
            • Delete a resource group
            • Clear cgroup configurations
          • Manage resource isolation (MySQL mode)
            • Configure cgroups
            • Configure user-level resource isolation
            • Calibrate the disk performance
            • Configure SQL statement-level resource isolation
            • Update a resource management plan config
            • Delete a resource management plan config
            • Delete a resource management plan
            • Delete a resource group
            • Clear cgroup configurations
        • View tenant and resource information
        • View and set a tenant allowlist
        • View system variables of a tenant
        • Modify system variables of a tenant
        • Scale in/out
          • Tenant scaling
          • Modify the unit configs for a tenant
          • Modify the number of resource units for a tenant
          • Modify the number of primary zones for a tenant
        • Modify attributes of a resource pool
        • Modify attributes of a tenant
        • Lock and unlock a tenant
        • Drop a tenant
        • Restore a tenant
        • Rename a tenant
        • Manage resource pools
          • View resource pools
          • Allocate a resource pool to a tenant
          • Remove a resource pool from a tenant
          • Merge resource pools and split a resource pool
          • Drop a resource pool
        • Manage unit configs
          • Query unit configs
          • Modify a unit config
          • Drop a unit config
    • Manage replicas
      • Overview
      • Replica distribution
        • Locality
        • Locality common operations
          • View locality
          • Modify locality
          • Add replicas
          • Remove replicas
          • Adjust the distribution of replicas
          • View the locality change history
          • Migrate units
      • Traffic distribution
      • Data distribution
    • High availability
      • Overview
      • Multi-replica disaster recovery
        • Data links
        • High availability of ODP
        • Database-level high availability
        • Disaster recovery architecture and levels
      • Physical standby database disaster recovery
        • Overview
        • Limitations
        • Create a standby tenant
          • Preparations
          • Create an empty standby tenant
          • Create a standby tenant by using the backup and recovery feature
          • Create a standby tenant by using the BACKUP DATABASE PLUS ARCHIVELOG feature
        • Log transmission service
          • Overview
          • Configure log transmission service
            • Specify a log restore source
            • Specify a log restore end point
          • View the log restore source
          • View the log synchronization progress
          • Suspend or enable log synchronization
          • Optimize the log synchronization performance
          • Specify log synchronization throttling
          • Specify log compression
        • Log storage service
        • Switch roles
          • Overview
          • Switchover
          • Failover
        • Drop a primary or standby tenant
      • Arbitration high availability
        • Overview
        • Enable the arbitration service for a tenant
        • Disable the arbitration service for a tenant
        • Modify the log stream downgrade control time
        • Replace the arbitration service for a cluster
        • Remove the arbitration service for a cluster
        • Clear residual cluster information
      • Manage recycle bin
        • Overview
        • Enable or disable the recycle bin
        • View objects in the recycle bin
        • Restore objects from the recycle bin
        • Purge the recycle bin
      • Flashback queries
    • Security and permissions
      • Overview
      • Identification and authentication
        • MySQL mode
          • Identity authentication
          • Password complexity
          • Logon failure processing
        • Oracle mode
          • Identity authentication
          • Password complexity
          • Logon failure processing
      • Access control
        • Overview
        • Users and permissions
          • Overview
          • MySQL mode
            • Create a user
            • Privilege types in MySQL mode
            • Grant privileges
            • Privilege delegation
            • View user privileges
            • Modify user privileges
            • Lock or unlock a user
            • Drop a user
          • Oracle mode
            • Privilege types in Oracle mode
            • Create a user
            • Grant direct privileges
            • Privilege delegation
            • Manage roles
              • Overview
              • Create a role
              • Grant a role to another role
              • Grant a role to a user
              • Activate or deactivate roles for a user
              • View roles
              • Modify a role
              • Revoke a role
              • Drop a role
            • Grant indirect privileges
            • View user privileges
            • Modify user privileges
            • Lock or unlock a user
            • Drop a user
        • Network security access control
        • RPC connection authentication
        • Row-level access control
      • Data transmission encryption
        • Overview
        • OBServer transmission encryption
        • ODP transmission encryption
      • Transparent data encryption
        • Overview
        • MySQL mode
          • Enable transparent data encryption for new tables
          • Enable transparent data encryption for existing tables
          • Decrypt a table
        • Oracle mode
          • Enable transparent data encryption for new tables
          • Enable transparent data encryption for existing tables
          • Decrypt a table
      • Security audit
        • Overview
        • Enable security audit
        • Set and view audit rules
        • View audit records
        • Audit user logon operations
        • Audit user operations
        • Audit specified database objects
    • Backup and restore
      • Introduction to physical backup and restore
      • Deploy NFS
      • Log archive
        • Overview
        • Prepare for log archiving
        • Enable ARCHIVELOG
        • Disable ARCHIVELOG
        • View information about pieces
        • View the archiving progress
        • View the archiving history
        • View the archiving parameter settings
        • Change the destination of log archiving
        • Views related to log archiving
      • Data backup
        • Preparations
        • Initiate a full data backup job
        • Initiate an incremental data backup job
        • Stop a backup job
        • View the data backup progress
        • View the data backup history
        • View data backup parameter settings
        • Change the backup destination
        • Views related to data backup
      • Clear backup data
        • Automatic cleanup of expired backups
        • Stop backup cleanup
        • Query the backup cleanup progress
        • Query the backup cleanup history
        • Backup cleanup parameter
        • Views related to backup cleanup
      • Restore data
        • Preparations
        • Perform a physical restore
        • Cancel physical restore
        • Query the restore progress
        • Query the restore result
        • Upgrade a tenant after restore
        • Convert a standby tenant into primary tenant
        • Replay logs to a standby tenant
        • Physical restore parameters
        • Views related to physical restore
    • Monitor
      • Overview
      • Metrics
        • System monitoring
          • Overview
          • Metrics
          • Wait events
          • Latch events
        • SQL monitoring
          • Overview
          • SQL audit
          • Execution plans
      • Cases
    • Logs
      • Overview
      • Log levels
      • Log stability
      • Log control
      • Log metrics
      • View logs
        • Search for the logs of a specific SQL request
        • Query the log of a previous SQL request by using the SQL Trace feature
    • Daily inspection
      • Overview
      • Check cluster parameters
      • Check the host status
      • Check tenant resource usage
      • Check cluster resource usage
      • Check the OBServer node status
      • Check the NTP offset
      • Deadlock detection
      • End-to-end tracing
        • Overview
        • Process
        • Methods
        • Show end-to-end tracing information
    • Performance tuning
      • Overview
      • Identify bottlenecks on a link
      • Identify bottlenecks within components
        • ODP performance bottlenecks
        • ODP performance analysis
        • OBServer performance bottlenecks
          • Overview
          • Non-optimal plan
            • Non-optimal plans
            • Buffer tables
            • Cardinality
          • Hard parsing
          • Capacity issues
          • Internal wait events
      • SQL tuning
        • Execution plan optimization
          • Statistics and cost-based optimization
            • Statistic information
              • Collect statistic information
                • Automatic statistics collection
        • Business logic optimization
          • Schema Specification
        • Locate and analyze slow queries (1)
        • Locate and analyze slow queries (II)
    • Troubleshooting
      • Overview
      • Bootstrap
      • Storage
        • Minor compaction and major compaction
        • Memory-related errors
        • Migration, replication, and rebuild tasks
      • Election
        • Election
        • Leader switchover exceptions
        • Absence of the leader
      • Transaction
        • Transaction-related errors
        • Transaction rollbacks
        • Long-running transactions
        • Suspended transactions
        • Idle transactions
      • Log synchronization-related errors
      • Troubleshoot SQL execution errors
      • Application error -- the error message does not contain an OceanBase error code
      • Application error -- the error message contains an OceanBase error code
    • Emergency response
      • Analysis, diagnostics, and decision-making process
      • Common emergency problem handling
        • Problems caused by capacity changes
          • High disk I/O on a node
          • Tenant memory full
  • Reference
    • System principles
      • Overall architecture of OceanBase Database
      • Development of OceanBase Database
      • Multi-tenant architecture
        • Overview
        • Compatibility modes
        • Tenants
        • Tenants and resource management
          • Tenant resource management
          • Multi-tenant resource isolation
          • Resource unit balancing
      • Database objects
        • Oracle mode
          • Introduction
            • Overview
            • Database object types
            • Database object storage
            • Dependencies between database objects
          • Tables
            • Overview
            • Data type
              • Overview
              • Character data types
              • Numeric data types
              • Date and time data types
              • Rowid data types
              • LOB data types
              • Format model
                • Overview
                • Number format models
                • Datetime format models
              • Multi-model data types
            • Integrity constraints
            • Table storage
            • Table compression
            • Partitioned table
            • Tables with and without a primary key
            • Temporary tables
          • Indexes
            • Overview
            • Local and global indexes
            • Unique and non-unique indexes
            • Index usage
            • Index storage
          • Partitions
            • Overview
            • Partitioning keys
            • Partitioning types
            • Partitioned indexes
          • Views
            • Overview
            • Data manipulation in views
            • Data access from views
            • Updatable views
          • Other objects
            • Sequences
            • Synonyms
          • System views
            • Dictionary views
            • Performance views
          • Data integrity
            • Data integrity overview
            • Integrity constraint type
              • Overview
              • NOT NULL constraints
              • UNIQUE constraints
              • PRIMARY KEY constraints
              • FOREIGN KEY constraints
              • CHECK constraints
            • Use of integrity constraints
        • MySQL mode
          • Introduction
            • Overview
            • Database object types
            • Database object storage
            • Dependencies between database objects
          • Tables
            • Overview
            • Data type
              • Overview
              • Numeric data types
              • Date and time data types
              • Character data types
              • LOB data types
              • Multi-model data types
              • Spatial data types
            • Integrity constraints
            • Table storage
            • Table compression
            • Partitioned table
            • Tables with and without a primary key
          • Indexes
            • Overview of indexes
            • Local and global indexes
            • Unique and non-unique indexes
            • Index usage
            • Index storage
          • Partitions
            • Overview
            • Partitioning keys
            • Partitioning types
            • Partitioned indexes
          • Views
            • Overview
            • Data manipulation in views
            • Data access from views
            • Updatable views
          • System views
            • Dictionary views
            • Performance views
          • Data integrity
            • Data integrity overview
            • Integrity constraint type
              • Overview
              • NOT NULL constraints
              • UNIQUE KEY constraints
              • PRIMARY KEY constraints
              • FOREIGN KEY constraints
            • Use of integrity constraints
      • Distributed database objects
        • Overview
        • Cluster architecture
        • Data partitions and replicas
          • Overview
          • Log streams
          • Partition replica type
            • Overview
            • Full-featured replica
          • Multi-replica consensus protocols
        • Dynamic scaling
          • Cluster scaling
          • Tenant resource scaling
            • Overview
            • Horizontal scaling of tenant resources
            • Vertical scaling of tenant resources
            • Cross-zone management of tenant resources
      • Data link
        • Overview
        • Database proxy
          • Overview
          • SQL routing
          • Connection management
          • ODP configuration management
          • Logs and monitoring
        • Database connector
          • Overview
          • OBCI
          • OceanBase Connector/J
          • OceanBase Connector/C
      • User interface and query language
        • SQL
          • Introduction
            • SQL overview
            • SQL data access
            • SQL standards
          • SQL statements
            • SQL statement overview
            • DDL statements
            • DML statements
            • DCL statements
          • Execution process of SQL queries
          • Query SQL execution plans
          • Distributed execution plan
            • Perform distributed execution and parallel queries
            • Generate distributed execution plans
            • Run and disable a parallel query
            • Manage distributed execution plans
            • Perform parameter tuning for a parallel query
        • PL
          • PL concepts
            • Oracle mode
              • Subprograms
              • Stored Procedures
              • Functions
              • Triggers
              • Packages
            • MySQL mode
              • Subprograms
              • Stored procedures
              • Functions
              • Triggers
          • PL subprogram execution mechanism
        • Client programming languages
      • Transaction management
        • Transaction
          • Overview
          • Transaction structure
          • Statement-level atomicity
          • GTS
          • Transaction control
            • Overview
            • Active transactions
            • Savepoint
            • Transaction control statements
              • MySQL transaction control
              • Oracle transaction control
          • Redo logs
          • Local transactions
          • Distributed transaction
            • Overview
            • Two-phase commit
          • XA transactions
        • Transaction concurrency and consistency
          • Overview
          • Multi-version read consistency
          • Concurrency control
            • Overview
            • Lock mechanism
          • Transaction isolation level
            • Overview
            • Transaction isolation levels in Oracle mode
            • Transaction isolation levels in MySQL mode
          • Weak consistency read
      • Storage architecture
        • Overview
        • Data storage
          • Overview
          • MemTables
          • SSTable
          • Compression and encoding
        • Compaction
          • Overview
          • Minor compaction
          • Merges
        • Multi-level caches
        • Query processing
        • Data integrity
          • Detect silent data corruption
      • Data reliability and high availability
        • High availability architecture
          • Overview
          • ODP high availability
          • Leader election in distributed systems
          • Multi-replica log synchronization
          • Paxos protocol
          • Automatic handling of node faults
        • Deployment solutions for disaster recovery
        • Data protection
          • Overview
          • Flashback queries
          • Recycle bin variables
        • Backup and restore
          • Overview
          • Backup directory structures
          • Backup architecture
          • Restore architecture
      • Database security
        • Overview
        • Authentication
        • Access control
        • Data transmission encryption
        • Data storage encryption
        • Monitoring and alert
        • Security audit
      • OBServer node architecture
        • Structure of the OBServer node working directory
        • Configuration files
        • observer thread model
          • Threads
          • Worker threads
          • Background threads
        • Logs
        • Memory management
          • Overview
          • Memory-related parameters
          • Memory-related views
          • Memory usage logs
          • Diagnose memory errors
    • System management
      • Configuration management
        • Overview
        • Set parameters
        • Set variables
        • General system parameters
        • Default production parameters
        • Minimum resource configurations
      • Storage management
        • Minor compaction management
          • Overview
          • Automatically trigger a minor compaction
          • Manually initiate a minor compaction
          • View the details of minor compactions
          • Modify minor compaction configurations
        • Major compaction management
          • Overview
          • Automatically trigger a major compaction
          • Configure scheduled major compactions
          • Adaptive major compaction
          • Manually initiate a major compaction
          • Manually control a major compaction
          • View the compaction process
          • Modify major compaction parameters
        • Data compression
          • Overview
          • Data encoding and compression
      • Memory management
        • Overview
        • Memory structure
        • Set the maximum memory for an OceanBase database
        • Manage internal system memory
        • Manage internal tenant memory
        • Manage the memory of the plan cache
        • Memleak-based regular memory leak diagnostics mechanism
        • Query memory usage information
        • Common memory issues
      • Process management
        • Overview
        • Multi-tenant threads of OceanBase Database
        • View the thread status
        • Background threads of OceanBase Database
        • FAQ about multi-tenant threads
      • Disk management
        • Configure automatic scale-out of disk space for data files
    • Database object management
      • Overview
      • MySQL mode
        • Create and manage databases
          • Create a database
          • View databases
          • Modify a database
          • Drop a database
        • Create and manage tables
          • Overview
          • Create a table
          • Define an auto-increment column
          • Define column constraints
          • Query the definition of a table
          • Modify a table
          • Empty a table
          • Drop a table
          • Lock a table
          • Create and manage external tables
            • Overview
            • Create an external table
            • Manage external files
        • Create and manage partitions
          • Overview
          • Create a partitioned table
          • Modify partitioning rules
          • Add a partition
          • Drop a partition
          • Truncate a partition
          • Partition pruning
          • Query data in specified partitions
          • Create indexes on partitioned tables
            • Overview
            • Local indexes
            • Global indexes
        • Create and manage table groups
          • Overview
          • Create a table group
          • Query information about a table group
          • Add tables to a table group
          • Modify the SHARDING attribute of a table group
          • Manage tables in a table group
          • Drop a table group
        • Create and manage indexes
          • Overview
          • Create an index
          • Query indexes
          • Drop an index
          • System functions supported for function-based indexes
          • System functions not supported for function-based indexes
        • Manage views
        • Create and manage sequences
          • Create a sequence
          • Query sequences
          • Reference a sequence
          • Modify a sequence
          • Drop a sequence
        • Create and manage triggers
          • Overview
          • Create a DML trigger
          • Query trigger information
          • Drop a trigger
        • Create and manage DBLinks
          • Create a DBLink
          • Query a DBLink
          • Use a DBLink to access data in a remote database
          • Drop a DBLink
      • Oracle mode
        • Create and manage tables
          • Overview
          • Create a table
          • Define column constraints
          • Query the definition of a table
          • Modify a table
          • Empty a table
          • Drop a table
          • Lock a table
          • Create and manage external tables
            • Overview
            • Create an external table
            • Manage external files
        • Create and manage partitions
          • Overview
          • Create a partitioned table
          • Modify partitioning rules
          • Add a partition
          • Drop a partition
          • Truncate a partition
          • Partition pruning
          • Query data in specified partitions
          • Create indexes on partitioned tables
            • Overview
            • Local indexes
            • Global indexes
        • Create and manage table groups
          • Overview
          • Create a table group
          • Query information about a table group
          • Add tables to a table group
          • Modify the SHARDING attribute of a table group
          • Manage tables in a table group
          • Drop a table group
        • Create and manage indexes
          • Overview
          • Create an index
          • Query indexes
          • Drop an index
          • System functions supported for function-based indexes
          • System functions not supported for function-based indexes
        • Manage views
        • Manage sequences
        • Manage synonyms
        • Create and manage triggers
          • Overview
          • Create a DML trigger
          • Create an INSTEAD OF trigger
          • Create a composite trigger
          • Modify and drop a trigger
          • Disable or enable a trigger
          • Query trigger information
        • Manage directory objects
        • Create and manage DBLinks
          • Create a DBLink
          • Query existing DBLinks
          • Use a DBLink to access data in a remote database
          • Use a DBLink to modify data in a remote database
          • Drop a DBLink
          • Install and configure OCI
    • Database design specifications and practices
      • Object naming conventions
        • Overview
        • Tenant naming conventions
        • User naming conventions
        • Table naming conventions
        • Field naming conventions
        • Other naming conventions
      • Object structure design specifications
        • Field design
        • Table structure design
        • Partitioned table design
        • Index design
        • Other structural designs
      • Character set specifications
      • Database connection specifications
      • Comments
      • ORM conventions
      • Exception handling
    • SQL reference
      • SQL syntax
        • System tenants
          • Overview
          • ALTER SYSTEM
            • ACTIVATE
            • ARCHIVELOG
            • ARBITRATION
            • BOOTSTRAP
            • BACKUP
            • BALANCE TASK
            • CANCEL MIGRATE UNIT
            • MERGE
            • MIGRATE UNIT
            • DELETE BACKUP
            • FAILOVER
            • FLUSH PLAN CACHE
            • JOB
            • LOG RESTORE SOURCE
            • PARAMETER
            • RECOVER
            • REFRESH
            • RESTORE
            • SERVER
            • SWITCHOVER
            • THROTTLE
            • ZONE
          • ALTER RESOURCE POOL
          • ALTER RESOURCE TENANT
          • ALTER RESOURCE UNIT
          • ALTER TENANT
          • CREATE RESOURCE POOL
          • CREATE RESOURCE UNIT
          • CREATE TENANT
          • DROP RESOURCE POOL
          • DROP RESOURCE UNIT
          • DROP TENANT
          • SET DECRYPTION
          • SET ENCRYPTION
        • User tenants (MySQL mode)
          • Basic elements
            • Data types
              • Overview
              • Numeric types
                • Overview
                • Integer data types
                • Fixed-point data types
                • Floating-point data types
                • Bit value data type
              • Date and time types
                • Overview
                • DATE, DATETIME, and TIMESTAMP types
                • TIME type
                • YEAR type
              • String types
                • Overview
                • CHAR and VARCHAR
                • BINARY and VARBINARY
              • Large objects and text types
                • Overview
                • BLOB types
                • TEXT types
              • ENUM type
              • SET type
              • JSON data types
                • Overview
                • Create a JSON value
                • Query and modify JSON values
                • Convert a JSON data type
              • Spatial data types
                • Overview
                • SRS
                • Create a spatial column
                • Create a spatial index
                • Spatial data formats
            • Expressions
              • Overview
              • Expression syntax
              • Convert data types in expression evaluation
            • Character set and collation
              • Overview
              • Character sets
              • Collations
              • Database-level character sets and collations
              • Table-level character sets and collations
              • Column-level character sets and collations
              • Character sets and collations for character expressions
              • Character sets and collations for client connection
            • Literals
              • Overview
              • Strings
              • Numbers
              • Date and time values
              • Bit values
              • Boolean values
              • NULLs
            • Schema object names
            • User-defined variables
            • Comments
          • Operators
            • Overview
            • Operator precedence
            • Arithmetic operators
            • Bitwise operators
            • Comparison operators
            • Logical operators
            • Assignment operators
            • Date and time operators
            • Concatenation operators
            • BINARY operator
            • CASE conditional operator
          • Sequence pseudocolumns
          • Functions
            • Overview
            • Single-row functions
              • Date and time functions
                • ADDDATE
                • CONVERT_TZ
                • CURDATE
                • CURRENT_DATE
                • CURRENT_TIME
                • CURRENT_TIMESTAMP
                • CURTIME
                • DATE
                • DATE_ADD
                • DATE_FORMAT
                • DATE_SUB
                • DATEDIFF
                • DAYOFMONTH
                • DAYOFWEEK
                • DAYOFYEAR
                • EXTRACT
                • FROM_DAYS
                • FROM_UNIXTIME
                • GET_FORMAT
                • HOUR
                • LAST_DAY
                • LOCALTIME
                • LOCALTIMESTAMP
                • MAKEDATE
                • MAKETIME
                • MICROSECOND
                • MINUTE
                • MONTH
                • MONTHNAME
                • NOW
                • PERIOD_ADD
                • PERIOD_DIFF
                • QUARTER
                • SEC_TO_TIME
                • SECOND
                • STR_TO_DATE
                • SUBDATE
                • SUBTIME
                • SYSDATE
                • TIME
                • TIME_FORMAT
                • TIME_TO_SEC
                • TIME_TO_USEC
                • TIMEDIFF
                • TIMESTAMP
                • TIMESTAMPADD
                • TIMESTAMPDIFF
                • TO_DAYS
                • TO_SECONDS
                • UNIX_TIMESTAMP
                • USEC_TO_TIME
                • UTC_DATE
                • UTC_TIME
                • UTC_TIMESTAMP
                • WEEK
                • WEEKDAY
                • WEEKOFYEAR
                • YEARWEEK
                • YEAR
                • ADDTIME
                • DAYNAME
                • DAY
              • String functions
                • ASCII
                • BIN
                • BIT_LENGTH
                • CHAR
                • CHAR_LENGTH
                • CHARACTER_LENGTH
                • CONCAT
                • CONCAT_WS
                • ELT
                • EXPORT_SET
                • FIELD
                • FIND_IN_SET
                • FORMAT
                • HEX
                • INSERT
                • INSTR
                • INT2IP
                • IP2INT
                • LCASE
                • LEFT
                • LENGTH
                • LOCATE
                • LOWER
                • LPAD
                • LTRIM
                • MAKE_SET
                • MID
                • OCT
                • OCTET_LENGTH
                • ORD
                • POSITION
                • QUOTE
                • REGEXP
                • REGEXP_INSTR
                • REGEXP_LIKE
                • REGEXP_REPLACE
                • REGEXP_SUBSTR
                • REPEAT
                • REPLACE
                • REVERSE
                • RIGHT
                • RLIKE
                • RPAD
                • RTRIM
                • SPACE
                • STRCMP
                • SUBSTR
                • SUBSTRING
                • SUBSTRING_INDEX
                • TRIM
                • UCASE
                • UNHEX
                • UPPER
                • WEIGHT_STRING
                • TO_BASE64
                • FROM_BASE64
                • SOUNDEX
              • Conversion functions
                • CAST
                • CONVERT
                • SCN_TO_TIMESTAMP
                • TIMESTAMP_TO_SCN
              • Mathematical functions
                • ABS
                • ACOS
                • ASIN
                • ATAN
                • ATAN2
                • BIT_COUNT
                • CEIL
                • CEILING
                • CONV
                • COS
                • COT
                • CRC32
                • DEGREES
                • EXP
                • FLOOR
                • GENERATOR
                • LN
                • LOG
                • LOG10
                • LOG2
                • MOD
                • NEG
                • NORMAL
                • PI
                • POW
                • POWER
                • RADIANS
                • RAND
                • RANDOM
                • RANDSTR
                • ROUND
                • SIGN
                • SIN
                • SQRT
                • TAN
                • TRUNCATE
                • UNIFORM
                • ZIPF
              • Comparison functions
                • GREATEST
                • INTERVAL
                • ISNULL
                • LEAST
              • Process control functions
                • CASE
                • IF
                • IFNULL
                • NULLIF
                • ORA_DECODE
            • Aggregate functions
              • APPROX_COUNT_DISTINCT
              • AVG
              • BIT_AND
              • BIT_OR
              • BIT_XOR
              • COUNT
              • GROUP_CONCAT
              • GROUPING
              • MAX
              • MIN
              • STD
              • STDDEV
              • STDDEV_POP
              • STDDEV_SAMP
              • SUM
              • VAR_POP
              • VAR_SAMP
              • VARIANCE
            • Analysis functions
              • APPROX_COUNT_DISTINCT
              • AVG
              • BIT_AND
              • BIT_OR
              • BIT_XOR
              • COUNT
              • CUME_DIST
              • DENSE_RANK
              • FIRST_VALUE
              • LAG
              • LAST_VALUE
              • LEAD
              • MAX
              • MIN
              • NTH_VALUE
              • NTILE
              • PERCENT_RANK
              • RANK
              • ROW_NUMBER
              • STD
              • STDDEV
              • STDDEV_POP
              • STDDEV_SAMP
              • SUM
              • VAR_POP
              • VAR_SAMP
              • VARIANCE
            • Encryption functions
              • AES_DECRYPT
              • AES_ENCRYPT
              • COMPRESS
              • DECODE
              • DES_DECRYPT
              • DES_ENCRYPT
              • ENCODE
              • ENCRYPT
              • MD5
              • UNCOMPRESS
              • UNCOMPRESSED_LENGTH
              • RANDOM_BYTES
              • SHA
              • SHA1
              • SHA2
              • VALIDATE_PASSWORD_STRENGTH
            • Information functions
              • BENCHMARK
              • CHARSET
              • COERCIBILITY
              • COLLATION
              • CONNECTION_ID
              • CURRENT_USER
              • DATABASE
              • FOUND_ROWS
              • LAST_INSERT_ID
              • ICU_VERSION
              • ROW_COUNT
              • SCHEMA
              • SESSION_USER
              • SYSTEM_USER
              • USER
              • VERSION
              • OB_VERSION
            • JSON functions
              • Create JSON text functions
                • JSON_ARRAY
                • JSON_OBJECT
                • JSON_QUOTE
              • Search JSON text functions
                • JSON_CONTAINS
                • JSON_CONTAINS_PATH
                • JSON_EXTRACT
                • JSON_KEYS
                • JSON_OVERLAPS
                • JSON_SEARCH
                • JSON_VALUE
                • MEMBER OF
              • Modify JSON text functions
                • JSON_ARRAY_APPEND
                • JSON_ARRAY_INSERT
                • JSON_INSERT
                • JSON_MERGE
                • JSON_MERGE_PATCH
                • JSON_MERGE_PRESERVE
                • JSON_REMOVE
                • JSON_REPLACE
                • JSON_SET
                • JSON_UNQUOTE
              • Return JSON text property functions
                • JSON_DEPTH
                • JSON_LENGTH
                • JSON_TYPE
                • JSON_VALID
              • JSON utility functions
                • JSON_PRETTY
                • JSON_STORAGE_SIZE
              • JSON aggregate functions
                • JSON_ARRAYAGG
                • JSON_OBJECTAGG
            • Spatial functions
              • Functions that create geometry values
              • Spatial operation functions
              • Spatial relation functions
              • Geometry property functions
              • Geometry format conversion functions
            • Performance schema functions
              • FORMAT_BYTES
              • FORMAT_PICO_TIM
            • Other functions
              • ANY_VALUE
              • BIN_TO_UUID
              • COALESCE
              • DEFAULT
              • NAME_CONST
              • INET_ATON
              • INET_NTOA
              • INET6_ATON
              • INET6_NTOA
              • IS_IPV4
              • IS_IPV4_COMPAT
              • IS_IPV6
              • IS_UUID
              • NVL
              • UUID_TO_BIN
              • SLEEP
              • UUID
              • UUID_SHORT
              • VALUES
          • Queries and subqueries
            • Overview
            • Subqueries
            • Joins
          • SQL statements
            • General syntax
            • Common Table Expressions
            • ALTER DATABASE
            • ALTER EXTERNAL TABLE
            • ALTER OUTLINE
            • ALTER SEQUENCE
            • MERGE
            • ALTER TABLE
            • ALTER TABLEGROUP
            • ALTER USER
            • ALTER VIEW
            • ANALYZE
            • CREATE DATABASE LINK
            • CREATE DATABASE
            • CREATE EXTERNAL TABLE
            • CREATE INDEX
            • CREATE OUTLINE
            • DROP RESTORE POINT
            • CREATE SEQUENCE
            • CREATE TABLE
            • CREATE TABLEGROUP
            • CREATE USER
            • CREATE VIEW
            • DEALLOCATE PREPARE
            • DROP DATABASE LINK
            • DELETE
            • DESCRIBE
            • DROP DATABASE
            • DROP INDEX
            • DROP OUTLINE
            • DROP TABLE
            • DROP TABLEGROUP
            • DROP SEQUENCE
            • DROP USER
            • DROP VIEW
            • EXECUTE
            • EXPLAIN
            • FLASHBACK
            • GRANT
            • HELP
            • INSERT
            • KILL
            • LOAD DATA
            • LOCK TABLES
            • MERGE
            • OPTIMIZE
            • PREPARE
            • PURGE
            • PURGE RECYCLEBIN
            • RENAME USER
            • RENAME TABLE
            • REPLACE
            • REVOKE
            • SAVEPOINT
            • SCHEMA
            • SELECT INTO
            • SELECT
              • SELECT statement
              • JOIN clause
              • OVER clause
              • UNION clause
            • SET
            • SET CHARSET
            • SET NAMES
            • SET PASSWORD
            • SET TRANSACTION
            • SHOW
            • TRANSACTION
            • TRUNCATE TABLE
            • UPDATE
            • USE
          • DDL feature
            • Overview
            • Index operations
            • Primary key operations
            • Column operations
            • Generated column operations
            • Foreign key operations
            • Table operations
            • Partition operations
            • Column type change rules
        • User tenants (Oracle mode)
          • Introduction to SQL
          • Pseudo columns
            • Overview
            • Hierarchical query pseudocolumns
            • Sequence pseudocolumns
            • ORA_ROWSCN pseudocolumn
            • ROWNUM pseudocolumn
            • ROWID pseudocolumn
          • Basic elements
            • Built-in data types
              • Overview
              • Character data types
                • Overview
                • CHAR data type
                • NCHAR data type
                • NVARCHAR2 data type
                • VARCHAR2 data type
                • VARCHAR data type
              • Numeric data types
                • Overview
                • NUMBER data type
                • FLOAT data type
                • Floating-point numbers
                • Precedence of numeric data types
              • Date, time, and interval data types
                • Overview
                • DATE data type
                • TIMESTAMP data type
                • TIMESTAMP WITH TIME ZONE data type
                • TIMESTAMP WITH LOCAL TIME ZONE data type
                • INTERVAL YEAR TO MONTH data type
                • INTERVAL DAY TO SECOND data type
                • Calculation of dates, timestamps, and intervals
              • RAW data type
              • Large object data types
                • Overview
                • BLOB data type
                • CLOB data type
              • Rowid data types
              • User-defined data types
              • Any types
              • JSON data types
                • Overview
                • Create JSON columns
                • Query JSON data
                • Conversion rules for JSON data types
              • XML data types
                • Overview
                • XML data definition
                • Create an XMLType column
                • Query XMLType data
                • Convert XMLType data
            • Data type comparison rules
              • Overview
              • Numeric value comparison rules
              • Date value comparison rules
              • Character value comparison rules
              • Data type precedence
              • Data type conversion rules
              • Security considerations for data conversion
            • Literals
              • Overview
              • Text literals
              • Numeric literals
              • Date and time literals
                • Date literals
                • Timestamp literals
              • Interval literals
            • Format model
              • Overview
              • Number format models
              • Datetime format models
              • RR datetime format element
              • String-to-date conversion rules
            • NULL value
              • Overview
              • NULLs in SQL functions
              • NULLs in comparison conditions
              • NULLs in conditional expressions
            • Annotations
              • Overview
              • Comments within SQL statements
              • Comments on schema and nonschema objects
              • Hints
                • Overview
                • Hint list
                  • Hints related to access path
                  • Hints related to join orders
                  • Hints related to joins
                  • Hints related to parallel execution
                  • Hints related to query strategy
                  • Hints related to query conversion
                  • Other hints
            • Database objects
              • Schema objects
              • Non-schema objects
            • Database naming conventions
              • Overview
              • Suggestions on schema object names
            • Database object reference methods
              • Overview
              • Reference schema objects
              • Reference objects in a remote database
                • Create a DBLink
                • Reference a DBLink
              • Reference partitioned tables and indexes
              • Reference an attribute or method of an object type
            • Character sets and collations
          • Operators
            • Overview
            • Operator precedence
            • Arithmetic operators
            • Concatenation operator
            • Hierarchical query operators
            • Set operators
            • COLLATE operator
          • Functions
            • Overview
            • Single-row functions
              • Numeric functions
                • ABS
                • ACOS
                • ASIN
                • ATAN
                • ATAN2
                • BITAND
                • CEIL
                • COS
                • COSH
                • EXP
                • FLOOR
                • GENERATOR
                • LN
                • LOG
                • MOD
                • NANVL
                • NORMAL
                • POWER
                • REMAINDER
                • ROUND
                • RANDOM
                • RANDSTR
                • SIGN
                • SIN
                • SINH
                • SQRT
                • TAN
                • TANH
                • TRUNC
                • UNIFORM
                • WIDTH_BUCKET
                • ZIPF
              • String functions that return a string
                • CHR
                • CONCAT
                • INITCAP
                • LOWER
                • LPAD
                • LTRIM
                • NLS_LOWER
                • NLSSORT
                • NLS_UPPER
                • REGEXP_REPLACE
                • REGEXP_SUBSTR
                • REPLACE
                • RPAD
                • RTRIM
                • SUBSTR
                • TRANSLATE
                • TRANSLATE ... USING
                • TRIM
                • UPPER
              • String functions that return numbers
                • ASCII
                • INSTR
                • LENGTH
                • REGEXP_COUNT
                • REGEXP_INSTR
              • Date and time functions
                • ADD_MONTHS
                • CURRENT_DATE
                • CURRENT_TIMESTAMP
                • DBTIMEZONE
                • EXTRACT(datetime)
                • FROM_TZ
                • LAST_DAY
                • LOCALTIMESTAMP
                • MONTHS_BETWEEN
                • NEXT_DAY
                • NUMTODSINTERVAL
                • NUMTOYMINTERVAL
                • ROUND(date)
                • SESSIONTIMEZONE
                • SYS_EXTRACT_UTC
                • SYSDATE
                • SYSTIMESTAMP
                • TO_CHAR(datetime)
                • TO_DSINTERVAL
                • TO_TIMESTAMP
                • TO_TIMESTAMP_TZ
                • TO_YMINTERVAL
                • TRUNC(date)
                • TZ_OFFSET
              • Generic comparison functions
                • GREATEST
                • LEAST
              • Conversion functions
                • ASCIISTR
                • CAST
                • CHARTOROWID
                • CONVERT
                • HEXTORAW
                • NUMTODSINTERVAL
                • NUMTOYMINTERVAL
                • RAWTOHEX
                • ROWIDTOCHAR
                • ROWIDTONCHAR
                • SCN_TO_TIMESTAMP
                • TIMESTAMP_TO_SCN
                • TO_BINARY_DOUBLE
                • TO_BINARY_FLOAT
                • TO_BLOB
                • TO_CHAR(character)
                • TO_CHAR(datetime)
                • TO_CHAR(number)
                • TO_CLOB
                • TO_DATE
                • TO_DSINTERVAL
                • TO_MULTI_BYTE
                • TO_NUMBER
                • TO_NCHAR(character)
                • TO_NCHAR(datetime)
                • TO_NCHAR(number)
                • TO_SINGLE_BYTE
                • TO_TIMESTAMP
                • TO_TIMESTAMP_TZ
                • TO_YMINTERVAL
                • UNISTR
              • Encoding and decoding functions
                • DECODE
                • DUMP
                • ORA_HASH
                • VSIZE
              • Null value related functions
                • COALESCE
                • LNNVL
                • NANVL
                • NULLIF
                • NVL
                • NVL2
              • Environment and identifier functions
                • SYS_CONTEXT
                • SYS_GUID
                • UID
                • USER
                • USERENV
                • OB_VERSION
              • Hierarchical functions
                • SYS_CONNECT_BY_PATH
              • JSON functions
                • Overview
                • Create JSON text functions
                  • JSON_ARRAY
                  • JSON_OBJECT
                  • JSON_ARRAYAGG
                  • JSON_OBJECTAGG
                • Query JSON text functions
                  • JSON_VALUE
                  • JSON_QUERY
                  • JSON_EXISTS
                  • JSON_TABLE
                • Validate JSON text functions
                  • JSON_EQUAL
                • Modify JSON text functions
                  • JSON_MERGEPATCH
              • XML functions
                • Overview
                • Construct XMLType data functions
                  • XMLAGG
                  • XMLATTRIBUTES
                  • XMLELEMENT
                  • XMLPARSE
                • Query XMLType data functions
                  • EXTRACT
                  • EXTRACT VALUE
                  • XMLSERIALIZE
                  • XMLCAST
                • Modify XMLType data functions
                  • UPDATEXML
            • Aggregate functions
              • APPROX_COUNT_DISTINCT
              • AVG
              • CORR
              • COUNT
              • COVAR_POP
              • COVAR_SAMP
              • CUME_DIST
              • DENSE_RANK
              • GROUPING
              • KEEP
              • LISTAGG
              • MAX
              • MEDIAN
              • MIN
              • PERCENT_RANK
              • PERCENTILE_CONT
              • PERCENTILE_DISC
              • RANK
              • REGR_(Linear Regression)
              • ROLLUP
              • STDDEV
              • STDDEV_POP
              • STDDEV_SAMP
              • SUM
              • VAR_POP
              • VAR_SAMP
              • VARIANCE
              • WMSYS.WM_CONCAT/WM_CONCAT
            • Analysis functions
              • Analytic functions
              • AVG
              • CORR
              • COUNT
              • COVAR_POP
              • COVAR_SAMP
              • CUME_DIST
              • DENSE_RANK
              • FIRST_VALUE
              • KEEP
              • LAG
              • LAST_VALUE
              • LEAD
              • LISTAGG
              • MAX
              • MEDIAN
              • MIN
              • NTILE
              • NTH_VALUE
              • PERCENT_RANK
              • PERCENTILE_CONT
              • PERCENTILE_DISC
              • RANK
              • RATIO_TO_REPORT
              • REGR_(Linear Regression)
              • ROW_NUMBER
              • STDDEV
              • STDDEV_POP
              • STDDEV_SAMP
              • SUM
              • VAR_POP
              • VAR_SAMP
              • VARIANCE
              • WMSYS.WM_CONCAT/WM_CONCAT
          • Expressions
            • Overview
            • Simple expressions
            • Compound expressions
            • Case expressions
            • Column expressions
            • CURSOR expressions
            • Datetime expressions
            • Function expressions
            • Interval expressions
            • Scalar subquery expressions
            • Type constructor expressions
            • Expression list
          • Conditions
            • Overview
            • Condition precedence
            • Comparison conditions
            • Floating-point conditions
            • Logical conditions
            • Pattern-matching conditions
            • Null conditions
            • Compound conditions
            • BETWEEN condition
            • EXISTS condition
            • IN condition
          • Queries and subqueries
            • Overview
            • Simple query
            • Hierarchical query
            • Compound query
            • Join query
            • Subquery
            • DUAL table query
          • SQL statements
            • DDL
              • ALTER EXTERNAL TABLE
              • ALTER INDEX
              • ALTER KEYSTORE
              • ALTER OUTLINE
              • ALTER PROFILE
              • ALTER ROLE
              • ALTER SEQUENCE
              • ALTER SESSION
              • ALTER SYSTEM FLUSH PLAN CACHE
              • ALTER SYSTEM PARAMETER
              • ALTER TABLE
              • ALTER TABLEGROUP
              • ALTER USER
              • CREATE CONTEXT
              • CREATE DIRECTORY
              • CREATE DATABASE LINK
              • CREATE EXTERNAL TABLE
              • CREATE INDEX
              • CREATE KEYSTORE
              • CREATE OUTLINE
              • CREATE PROFILE
              • CREATE ROLE
              • CREATE SEQUENCE
              • CREATE SYNONYM
              • CREATE TABLE
              • CREATE TABLEGROUP
              • CREATE TABLESPACE
              • CREATE USER
              • CREATE VIEW
              • DROP CONTEXT
              • DROP DATABASE LINK
              • DROP DIRECTORY
              • DROP INDEX
              • DROP OUTLINE
              • DROP PROFILE
              • DROP ROLE
              • DROP SEQUENCE
              • DROP SYNONYM
              • DROP TABLE
              • DROP TABLEGROUP
              • DROP TABLESPACE
              • DROP USER
              • DROP VIEW
              • RENAME
              • TRUNCATE TABLE
              • ALTER SYSTEM MAJOR FREEZE
            • DML
              • DELETE
              • INSERT
              • MERGE
              • PURGE
              • EXPLAIN
              • SELECT
                • SIMPLE SELECT
                • Set-based SELECT
                • WITH CLAUSE
              • UPDATE
            • DCL
              • ANALYZE
              • AUDIT
              • COMMENT
              • COMMIT
              • FLASHBACK TABLE BEFORE DROP
              • GRANT
              • KILL
              • LOAD DATA
              • LOCK TABLE
              • REVOKE
              • ROLLBACK
              • SAVEPOINT
              • SET NAMES
              • SET PASSWORD
              • SET ROLE
              • SET VARIABLE
              • SHOW
              • SHRINK
              • TRANSACTION
          • DDL feature
            • Overview
            • Index operations
            • Primary key operations
            • Column operations
            • Generated column operations
            • Foreign key operations
            • Table operations
            • Partition operations
            • Column type change rules
      • SQL specifications and practices
        • Limitations on writing SQL statements
        • SQL writing specifications
          • SELECT statements
          • DML statements
          • Multi-table join statements
          • Table scan
          • Transactions
          • Cache
          • Hint
          • Other specifications
        • SQL statement examples
          • Implicit data type conversion
          • JOIN tables
          • Weak consistency read
          • Pagination queries
      • PL reference
        • What is PL
          • Overview
          • Main features of PL
          • PL architecture
        • PL reference (MySQL mode)
          • Syntax of PL stored programs
          • PL stored procedures
            • Overview
            • Variables in stored programs
            • Stored procedures
            • Stored functions
            • Trigger
            • Limitations on stored programs
          • PL cursors
            • Overview
            • Cursor execution process
            • Limitations on server cursors
          • PL conditional control statements
            • CASE
            • IF
            • ITERATE
            • LEAVE
            • LOOP
            • REPEAT
            • RETURN
            • WHILE
          • PL data manipulation statements
            • CALL
            • DO
          • PL data definition statements
            • ALTER FUNCTION
            • ALTER PROCEDURE
            • CREATE FUNCTION
            • CREATE PROCEDURE
            • CREATE TRIGGER
            • DROP FUNCTION
            • DROP PROCEDURE
            • DROP TRIGGER
          • PL database management statements
            • SHOW CREATE FUNCTION
            • SHOW CREATE PROCEDURE
            • SHOW CREATE TRIGGER
            • SHOW FUNCTION STATUS
            • SHOW PROCEDURE STATUS
            • SHOW TRIGGERS
          • PL related dictionary views
            • INFORMATION_SCHEMA PARAMETERS
            • INFORMATION_SCHEMA ROUTINES
            • INFORMATION_SCHEMA TRIGGERS
          • PL exception handling
            • Overview
            • DECLARE ... CONDITION
            • DECLARE ... HANDLER
            • GET DIAGNOSTICS
            • RESIGNAL
            • SIGNAL
            • Effective scope of an exception handler
            • Diagnostics area
            • Exception handling and OUT/INOUT parameters
            • Limitations on exception handling
          • PL system packages
            • Overview
            • DBMS_RESOURCE_MANAGER
              • Overview
              • CREATE_CONSUMER_GROUP
              • CREATE_PLAN
              • CREATE_PLAN_DIRECTIVE
              • DELETE_CONSUMER_GROUP
              • DELETE_PLAN
              • DELETE_PLAN_DIRECTIVE
              • SET_CONSUMER_GROUP_MAPPING
              • UPDATE_PLAN_DIRECTIVE
            • DBMS_STATS
              • Overview
              • ALTER_STATS_HISTORY_RETENTION
              • CREATE_STAT_TABLE
              • DELETE_COLUMN_STATS
              • DELETE_INDEX_STATS
              • DELETE_TABLE_STATS
              • DELETE_SCHEMA_STATS
              • DELETE_SCHEMA_PREFS
              • DELETE_TABLE_PREFS
              • DROP_STAT_TABLE
              • EXPORT_COLUMN_STATS
              • EXPORT_INDEX_STATS
              • EXPORT_TABLE_STATS
              • EXPORT_SCHEMA_STATS
              • FLUSH_DATABASE_MONITORING_INFO
              • GATHER_INDEX_STATS
              • GATHER_TABLE_STATS
              • GATHER_SCHEMA_STATS
              • GET_STATS_HISTORY_AVAILABILITY
              • GET_STATS_HISTORY_RETENTION
              • GET_PARAM
              • GET_PREFS
              • IMPORT_INDEX_STATS
              • IMPORT_COLUMN_STATS
              • IMPORT_TABLE_STATS
              • IMPORT_SCHEMA_STATS
              • LOCK_PARTITION_STATS
              • LOCK_SCHEMA_STATS
              • LOCK_TABLE_STATS
              • RESTORE_TABLE_STATS
              • RESTORE_SCHEMA_STATS
              • RESET_GLOBAL_PREF_DEFAULTS
              • RESET_PARAM_DEFAULTS
              • PURGE_STATS
              • SET_COLUMN_STATS
              • SET_INDEX_STATS
              • SET_TABLE_STATS
              • SET_GLOBAL_PREFS
              • SET_PARAM
              • SET_SCHEMA_PREFS
              • SET_TABLE_PREFS
              • UNLOCK_PARTITION_STATS
              • UNLOCK_SCHEMA_STATS
              • UNLOCK_TABLE_STATS
            • DBMS_UDR
              • Overview
              • CREATE_RULE
              • DISABLE_RULE
              • ENABLE_RULE
              • REMOVE_RULE
            • DBMS_XPLAN
              • Overview
              • DISPLAY_ACTIVE_SESSION_PLAN
              • DISPLAY_CURSOR
              • DISPLAY
              • DISABLE_OPT_TRACE
              • DISPLAY_SQL_PLAN_BASELINE
              • ENABLE_OPT_TRACE
              • SET_OPT_TRACE_PARAMETER
          • Reserved and non-reserved PL keywords
        • PL reference (Oracle mode)
          • PL language basics
            • Character sets
            • Lexical units
            • Declare
            • Reference identifiers
            • Scope and visibility of identifiers
            • Assign values
            • Expressions
            • PL blocks
            • Subprograms
            • Error-reporting functions
          • PL data types
            • Overview
            • SQL data types
            • LOB data types
            • BOOLEAN type
            • User-defined subtypes
            • PLS_INTEGER and BINARY_INTEGER
            • Arrays
            • PL JSON data types
          • PL process control
            • Overview
            • Conditional control
            • Loop control
            • Sequential control
          • PL collections and records
            • Overview
            • Collections
            • Associative arrays
            • Varrays
            • Nested tables
            • Collection constructor function
            • Collection methods
              • Overview
              • DELETE method
              • TRIM method
              • EXTEND method
              • EXISTS method
              • FIRST and LAST methods
              • COUNT method
              • LIMIT method
              • PRIOR and NEXT methods
            • Records
            • Insert records into a table and update a table by using records
            • Create and call a subprogram with record type parameters
          • PL static SQL
            • Overview
            • Cursors
              • Overview
              • Cursor attributes
              • Implicit cursors
              • Explicit cursors
              • Cursor variables
              • Traverse cursor data by using the FOR loop
              • Modify and drop a cursor
            • Transaction processing and control
            • Autonomous transactions
              • Overview
              • Control autonomous transactions
              • Autonomous triggers
              • Call autonomous functions from SQL statements
          • PL dynamic SQL
            • Overview
            • Execute dynamic SQL statements
            • DBMS_SQL system package
          • PL stored procedures and functions
            • Overview
            • Create a stored procedure
            • Create a function
            • Manage stored procedures and functions
            • Privilege control
            • Pipeline functions
              • Overview
              • Create a pipelined table function
              • Application
            • User-defined functions
              • Overview
              • Interface for user-defined aggregate functions
              • Create user-defined aggregate functions
              • Use user-defined aggregate functions
            • Collection of stored procedure information and its impact on parallel SQL execution
          • PL triggers
            • Overview
            • Create a DML trigger
            • Modify and drop a trigger
            • Disable or enable a trigger
            • Query trigger information
            • INSTEAD OF DML trigger
            • Compound DML trigger
          • PL packages
            • Overview
            • Create a program package
            • Overloaded programs in a package
            • Manage program packages
            • Definition of the PL environment by the STANDARD package
          • PL exception handling
            • Overview
            • Compile-time alerts
            • Exception types
            • Exception handling processes
          • DDL operations on stored PL units
            • Overview
            • ALTER FUNCTION
            • ALTER PACKAGE
            • ALTER PROCEDURE
            • ALTER TRIGGER
            • ALTER TYPE
            • CREATE FUNCTION
            • CREATE PACKAGE
            • CREATE PACKAGE BODY
            • CREATE PROCEDURE
            • CREATE TRIGGER
            • CREATE TYPE
            • CREATE TYPE BODY
            • DROP FUNCTION
            • DROP PACKAGE
            • DROP PROCEDURE
            • DROP TRIGGER
            • DROP TYPE
            • DROP TYPE BODY
          • PL label security package
            • Overview
            • SA_SYSDBA policy management package
              • Overview
              • SA_SYSDBA.ALTER_POLICY
              • SA_SYSDBA.CREATE_POLICY
              • SA_SYSDBA.DROP_POLICY
            • SA_COMPONENTS label component package
              • Overview
              • SA_COMPONENTS.ALTER_LEVEL
              • SA_COMPONENTS.CREATE_LEVEL
              • SA_COMPONENTS.DROP_LEVEL
            • SA_LABEL_ADMIN label management package
              • Overview
              • SA_LABEL_ADMIN.ALTER_LABEL
              • SA_LABEL_ADMIN.CREATE_LABEL
              • SA_LABEL_ADMIN.DROP_LABEL
            • SA_POLICY_ADMIN policy management package
              • Overview
              • SA_POLICY_ADMIN.APPLY_TABLE_POLICY
              • SA_POLICY_ADMIN.DISABLE_TABLE_POLICY
              • SA_POLICY_ADMIN.ENABLE_TABLE_POLICY
              • SA_POLICY_ADMIN.REMOVE_TABLE_POLICY
            • SA_USER_ADMIN user label management package
              • Overview
              • SA_USER_ADMIN.SET_LEVELS
            • SA_SESSION session management package
              • Overview
              • SA_SESSION.LABEL
              • SA_SESSION.RESTORE_DEFAULT_LABELS
              • SA_SESSION.ROW_LABEL
              • SA_SESSION.SET_LABEL
              • SA_SESSION.SET_ROW_LABEL
          • PL system package (Oracle mode)
            • Overview
            • DBMS_APPLICATION_INFO
              • Overview
              • READ_CLIENT_INFO
              • READ_MODULE
              • SET_ACTION
              • SET_CLIENT_INFO
              • SET_MODULE
            • DBMS_AUDIT_MGMT
              • Overview
              • CLEAN_AUDIT_TRAIL
              • CREATE_PURGE_JOB
              • DROP_PURGE_JOB
              • SET_LAST_ARCHIVE_TIMESTAMP
              • SET_PURGE_JOB_STATUS
            • DBMS_CRYPTO
              • Overview
              • ENCRYPT
              • DECRYPT
              • HASH
            • DBMS_DEBUG
              • Overview
              • ATTACH_SESSION
              • CONTINUE
              • DEBUG_ON
              • DEBUG_OFF
              • DETACH_SESSION
              • DELETE_BREAKPOINT
              • DISABLE_BREAKPOINT
              • ENABLE_BREAKPOINT
              • GET_VALUE
              • GET_VALUES
              • GET_RUNTIME_INFO
              • GET_TIMEOUT_BEHAVIOUR
              • INITIALIZE
              • PROBE_VERSION
              • PRINT_BACKTRACE
              • SET_TIMEOUT
              • SET_TIMEOUT_BEHAVIOUR
              • SET_BREAKPOINT
              • SHOW_BREAKPOINTS
            • DBMS_DESCRIBE
              • Overview
              • DESCRIBE_PROCEDURE
            • DBMS_JOB
              • Overview
              • BROKEN
              • CHANGE
              • ZONE
              • INTERVAL
              • NEXT_DATE
              • REMOVE
              • RUN
              • SUBMIT
              • USER_EXPORT
              • WHAT
            • DBMS_LOB
              • Overview
              • APPEND
              • CLOSE
              • COPY
              • CREATETEMPORARY
              • ERASE
              • FREETEMPORARY
              • GETLENGTH
              • ISOPEN
              • INSTR
              • OPEN
              • READ
              • SUBSTR
              • TRIM
              • WRITE
              • WRITEAPPEND
            • DBMS_LOCK
              • Overview
              • SLEEP
            • DBMS_METADATA
              • Overview
              • GET_DDL
            • DBMS_OUTPUT
              • Overview
              • DISABLE
              • ENABLE
              • GET_LINE
              • GET_LINES
              • NEW_LINE
              • PUT
              • PUT_LINE
            • DBMS_PLAN_CACHE
              • Overview
              • PURGE
            • DBMS_RANDOM
              • Overview
              • INITIALIZE
              • NORMAL
              • RANDOM
              • SEED
              • STRING
              • TERMINATE
              • VALUE
            • DBMS_RESOURCE_MANAGER
              • Overview
              • CREATE_CONSUMER_GROUP
              • CREATE_PLAN
              • CREATE_PLAN_DIRECTIVE
              • DELETE_CONSUMER_GROUP
              • DELETE_PLAN
              • DELETE_PLAN_DIRECTIVE
              • SET_CONSUMER_GROUP_MAPPING
              • UPDATE_PLAN_DIRECTIVE
            • DBMS_SCHEDULER
              • Overview
              • CREATE_JOB
              • CREATE_PROGRAM
              • DEFINE_PROGRAM_ARGUMENT
              • DISABLE
              • DROP_JOB
              • DROP_PROGRAM
              • ENABLE
              • GENERATE_JOB_NAME
              • RUN_JOB
              • SET_ATTRIBUTE
              • SET_JOB_ARGUMENT_VALUE
            • DBMS_SESSION
              • Overview
              • CLEAR_ALL_CONTEXT
              • CLEAR_CONTEXT
              • CLEAR_IDENTIFIER
              • RESET_PACKAGE
              • SET_CONTEXT
              • SET_IDENTIFIER
            • DBMS_SQL
              • Overview
              • BIND_VARIABLE
              • CLOSE_CURSOR
              • COLUMN_VALUE
              • DEFINE_COLUMN
              • DEFINE_ARRAY
              • DESCRIBE_COLUMNS
              • EXECUTE
              • EXECUTE_AND_FETCH
              • FETCH_ROWS
              • IS_OPEN
              • LAST_ERROR_POSITION
              • OPEN_CURSOR
              • PARSE
            • DBMS_STATS
              • Overview
              • ALTER_STATS_HISTORY_RETENTION
              • CREATE_STAT_TABLE
              • DELETE_COLUMN_STATS
              • DELETE_INDEX_STATS
              • DELETE_TABLE_STATS
              • DELETE_SCHEMA_STATS
              • DELETE_SCHEMA_PREFS
              • DELETE_TABLE_PREFS
              • DROP_STAT_TABLE
              • EXPORT_COLUMN_STATS
              • EXPORT_INDEX_STATS
              • EXPORT_TABLE_STATS
              • EXPORT_SCHEMA_STATS
              • FLUSH_DATABASE_MONITORING_INFO
              • GATHER_INDEX_STATS
              • GATHER_TABLE_STATS
              • GATHER_SCHEMA_STATS
              • GET_STATS_HISTORY_AVAILABILITY
              • GET_STATS_HISTORY_RETENTION
              • GET_PARAM
              • GET_PREFS
              • IMPORT_INDEX_STATS
              • IMPORT_COLUMN_STATS
              • IMPORT_TABLE_STATS
              • IMPORT_SCHEMA_STATS
              • LOCK_PARTITION_STATS
              • LOCK_SCHEMA_STATS
              • LOCK_TABLE_STATS
              • RESTORE_TABLE_STATS
              • RESTORE_SCHEMA_STATS
              • RESET_GLOBAL_PREF_DEFAULTS
              • RESET_PARAM_DEFAULTS
              • PURGE_STATS
              • SET_COLUMN_STATS
              • SET_INDEX_STATS
              • SET_TABLE_STATS
              • SET_GLOBAL_PREFS
              • SET_PARAM
              • SET_SCHEMA_PREFS
              • SET_TABLE_PREFS
              • UNLOCK_PARTITION_STATS
              • UNLOCK_SCHEMA_STATS
              • UNLOCK_TABLE_STATS
            • DBMS_UDR
              • Overview
              • CREATE_RULE
              • DISABLE_RULE
              • ENABLE_RULE
              • REMOVE_RULE
            • DBMS_UTILITY
              • Overview
              • ACTIVE_INSTANCES
              • COMMA_TO_TABLE
              • CURRENT_INSTANCE
              • DB_VERSION
              • FORMAT_CALL_STACK
              • FORMAT_ERROR_BACKTRACE
              • FORMAT_ERROR_STACK
              • GET_ENDIANNESS
              • GET_HASH_VALUE
              • GET_PARAMETER_VALUE
              • GET_SQL_HASH
              • GET_TIME
              • IS_BIT_SET
              • IS_CLUSTER_DATABASE
              • NAME_RESOLVE
              • NAME_TOKENIZE
              • OLD_CURRENT_SCHEMA
              • OLD_CURRENT_USER
              • PORT_STRING
              • TABLE_TO_COMMA
            • DBMS_WORKLOAD_REPOSITORY
              • Overview
              • ASH_REPORT
            • DBMS_XA
              • Overview
              • DBMS_XA constants
              • DBMS_XA_XID object type
              • DIST_TXN_SYNC
              • XA_COMMIT
              • XA_END
              • XA_FORGET
              • XA_GETLASTOER
              • XA_PREPARE
              • XA_RECOVER
              • XA_ROLLBACK
              • XA_SETTIMEOUT
              • XA_START
            • DBMS_XMLGEN
              • Overview
              • CONVERT
            • DBMS_XPLAN
              • Overview
              • DISPLAY_ACTIVE_SESSION_PLAN
              • DISPLAY_CURSOR
              • DISPLAY
              • DISABLE_OPT_TRACE
              • DISPLAY_SQL_PLAN_BASELINE
              • ENABLE_OPT_TRACE
              • SET_OPT_TRACE_PARAMETER
            • ODCIConst
              • Overview
              • ODCIArgDesc.ArgType
              • ODCIEnv.CallProperty
              • ODCIEnv.Envflags
              • ODCIIndexAlter
              • ODCIIndexAlter parameter alter_option
              • ODCIIndexInfo.IndexInfoFlags
              • ODCIIndexInfo.IndexParaDegree
              • ODCIPredInfo.Flags
              • ODCIQueryInfo.Flags
              • ODCIStatsOptions.Flags
              • ODCIStatsOptions.Options
              • Return Status
              • ScnFlg
            • UTL_ENCODE
              • Overview
              • BASE64_DECODE
              • BASE64_ENCODE
            • UTL_FILE
              • Overview
              • FCLOSE
              • FFLUSH
              • FOPEN
              • FGETPOS
              • FREMOVE
              • FRENAME
              • FSEEK
              • NEW_LINE
              • GET_LINE
              • PUT
              • PUT_LINE
            • UTL_I18N
              • Overview
              • RAW_TO_CHAR
              • STRING_TO_RAW
            • UTL_RAW
              • Overview
              • BIT_AND
              • BIT_COMPLEMENT
              • BIT_OR
              • BIT_XOR
              • CAST_FROM_BINARY_DOUBLE
              • CAST_FROM_BINARY_FLOAT
              • CAST_FROM_BINARY_INTEGER
              • CAST_FROM_NUMBER
              • CAST_TO_BINARY_DOUBLE
              • CAST_TO_BINARY_FLOAT
              • CAST_TO_BINARY_INTEGER
              • CAST_TO_NUMBER
              • CAST_TO_RAW
              • CAST_TO_VARCHAR2
              • COMPARE
              • CONCAT
              • COPIES
              • LENGTH
              • REVERSE
              • SUBSTR
            • ANYDATA TYPE
              • Overview
              • BEGINCREATE static procedure
              • ENDCREATE member procedure
              • GET* member functions
              • GETTYPE member function
              • GETTYPENAME member function
              • PIECEWISE member procedure
              • SET* member procedures
            • XMLType
              • Overview
              • CREATEXML
              • GETCLOBVAL
              • GETSTRINGVAL
              • TRANSFORM
              • XMLTYPE
          • Reserved PL keywords
      • Reserved keywords (MySQL mode)
      • Reserved keywords (Oracle mode)
    • Multi-model API
      • TableAPI
        • Introduction
          • Implementation of TableAPI
          • Differences between replace and insert_or_update
          • TableAPI data models
        • Use the TableAPI client
          • Introduction to the client and instructions for use
          • Set client parameters
          • An example of client use
        • FAQ
      • HBaseAPI
        • HBaseAPI solution introduction
        • HBaseAPI storage model
        • Usage instructions of the HBaseAPI client
    • System views
      • Overview
      • Overview of system views
      • Changes in views in OceanBase Database V3.x and V4.x
      • SYS tenant views
        • Dictionary views
          • information_schema.CHARACTER_SETS
          • oceanbase.DBA_OB_SERVER_JOBS
          • oceanbase.DBA_OB_SERVERS
          • oceanbase.DBA_OB_TABLEGROUP_PARTITIONS
          • oceanbase.DBA_OB_TABLEGROUP_SUBPARTITIONS
          • oceanbase.DBA_OB_TABLEGROUP_TABLES
          • oceanbase.DBA_OB_TABLEGROUPS
          • oceanbase.DBA_OB_TABLET_REPLICAS
          • oceanbase.DBA_OB_TABLET_TO_LS
          • oceanbase.DBA_OB_TENANT_JOBS
          • oceanbase.DBA_OB_TENANTS
          • oceanbase.DBA_OB_UNIT_JOBS
          • oceanbase.DBA_OB_UNIT_CONFIGS
          • oceanbase.DBA_OB_UNITS
          • oceanbase.DBA_OB_ZONE_MAJOR_COMPACTION
          • oceanbase.DBA_OB_ZONES
          • oceanbase.DBA_OBJECTS
          • oceanbase.DBA_PART_INDEXES
          • oceanbase.DBA_PART_KEY_COLUMNS
          • oceanbase.DBA_PART_TABLES
          • oceanbase.DBA_OB_SEQUENCE_OBJECTS
          • oceanbase.DBA_SUBPART_KEY_COLUMNS
          • oceanbase.DBA_SUBPARTITION_TEMPLATES
          • oceanbase.DBA_TAB_PARTITIONS
          • oceanbase.DBA_TAB_SUBPARTITIONS
          • oceanbase.CDB_IND_COLUMNS
          • oceanbase.CDB_IND_PARTITIONS
          • oceanbase.CDB_IND_SUBPARTITIONS
          • oceanbase.CDB_INDEXES
          • oceanbase.DBA_IND_PARTITIONS
          • oceanbase.DBA_IND_SUBPARTITIONS
          • oceanbase.DBA_OB_DATABASES
          • oceanbase.DBA_OB_LS_LOCATIONS
          • oceanbase.DBA_OB_MAJOR_COMPACTION
          • oceanbase.DBA_OB_RESOURCE_POOLS
          • oceanbase.DBA_OB_ROOTSERVICE_EVENT_HISTORY
          • oceanbase.CDB_OB_ARCHIVELOG_PIECE_FILES
          • oceanbase.CDB_OB_DATABASES
          • oceanbase.CDB_OB_LS_LOCATIONS
          • oceanbase.CDB_OB_MAJOR_COMPACTION
          • oceanbase.CDB_OB_RESTORE_HISTORY
          • oceanbase.CDB_OB_RESTORE_PROGRESS
          • oceanbase.CDB_OB_TABLEGROUP_PARTITIONS
          • oceanbase.CDB_OB_TABLEGROUP_SUBPARTITIONS
          • oceanbase.CDB_OB_TABLEGROUP_TABLES
          • oceanbase.CDB_OB_TABLEGROUPS
          • oceanbase.CDB_OB_TABLET_REPLICAS
          • oceanbase.CDB_OB_TABLET_TO_LS
          • oceanbase.CDB_OB_ZONE_MAJOR_COMPACTION
          • oceanbase.CDB_OBJECTS
          • oceanbase.CDB_PART_INDEXES
          • oceanbase.CDB_PART_KEY_COLUMNS
          • oceanbase.CDB_PART_TABLES
          • oceanbase.CDB_SUBPART_KEY_COLUMNS
          • oceanbase.CDB_SUBPARTITION_TEMPLATES
          • oceanbase.CDB_TAB_COL_STATISTICS
          • oceanbase.CDB_TAB_COLS
          • oceanbase.CDB_TAB_COLS_V$
          • oceanbase.CDB_TAB_PARTITIONS
          • oceanbase.CDB_TAB_SUBPARTITIONS
          • oceanbase.CDB_TABLES
          • oceanbase.CDB_OB_BACKUP_SET_FILES
          • oceanbase.DBA_OB_BACKUP_SET_FILES
          • oceanbase.CDB_OB_BACKUP_JOBS
          • oceanbase.DBA_OB_BACKUP_JOBS
          • oceanbase.CDB_OB_BACKUP_JOB_HISTORY
          • oceanbase.DBA_OB_BACKUP_JOB_HISTORY
          • oceanbase.CDB_OB_BACKUP_TASKS
          • oceanbase.DBA_OB_BACKUP_TASKS
          • oceanbase.CDB_OB_BACKUP_TASK_HISTORY
          • oceanbase.DBA_OB_BACKUP_TASK_HISTORY
          • oceanbase.DBA_OB_ARCHIVELOG_PIECE_FILES
          • oceanbase.DBA_OB_RESTORE_PROGRESS
          • oceanbase.DBA_OB_RESTORE_HISTORY
          • oceanbase.CDB_OB_ARCHIVE_DEST
          • oceanbase.DBA_OB_ARCHIVE_DEST
          • oceanbase.CDB_OB_ARCHIVELOG
          • oceanbase.DBA_OB_ARCHIVELOG
          • oceanbase.CDB_OB_ARCHIVELOG_SUMMARY
          • oceanbase.DBA_OB_ARCHIVELOG_SUMMARY
          • oceanbase.CDB_OB_BACKUP_PARAMETER
          • oceanbase.DBA_OB_BACKUP_PARAMETER
          • oceanbase.DBA_OB_OUTLINE_CONCURRENT_HISTORY
          • oceanbase.DBA_OB_OUTLINES
          • oceanbase.DBA_OB_CONCURRENT_LIMIT_SQL
          • oceanbase.CDB_OB_SYS_VARIABLES
          • oceanbase.CDB_OB_BACKUP_DELETE_JOBS
          • oceanbase.DBA_OB_BACKUP_DELETE_JOBS
          • oceanbase.CDB_OB_BACKUP_DELETE_JOB_HISTORY
          • oceanbase.DBA_OB_BACKUP_DELETE_JOB_HISTORY
          • oceanbase.CDB_OB_BACKUP_DELETE_TASKS
          • oceanbase.DBA_OB_BACKUP_DELETE_TASKS
          • oceanbase.CDB_OB_BACKUP_DELETE_TASK_HISTORY
          • oceanbase.DBA_OB_BACKUP_DELETE_TASK_HISTORY
          • oceanbase.CDB_OB_BACKUP_STORAGE_INFO
          • oceanbase.DBA_OB_BACKUP_STORAGE_INFO
          • oceanbase.CDB_OB_BACKUP_STORAGE_INFO_HISTORY
          • oceanbase.DBA_OB_BACKUP_STORAGE_INFO_HISTORY
          • oceanbase.CDB_OB_BACKUP_DELETE_POLICY
          • oceanbase.DBA_OB_BACKUP_DELETE_POLICY
          • oceanbase.CDB_OB_DEADLOCK_EVENT_HISTORY
          • oceanbase.DBA_OB_DEADLOCK_EVENT_HISTORY
          • oceanbase.CDB_OB_COLUMN_CHECKSUM_ERROR_INFO
          • oceanbase.CDB_OB_TABLET_CHECKSUM_ERROR_INFO
          • oceanbase.DBA_TAB_STATISTICS
          • oceanbase.DBA_TAB_COL_STATISTICS
          • oceanbase.DBA_PART_COL_STATISTICS
          • oceanbase.DBA_SUBPART_COL_STATISTICS
          • oceanbase.DBA_TAB_HISTOGRAMS
          • oceanbase.DBA_PART_HISTOGRAMS
          • oceanbase.DBA_SUBPART_HISTOGRAMS
          • oceanbase.DBA_TAB_STATS_HISTORY
          • oceanbase.DBA_SCHEDULER_JOBS
          • oceanbase.DBA_IND_STATISTICS
          • oceanbase.DBA_TAB_MODIFICATIONS
          • oceanbase.DBA_SQL_PLAN_BASELINES
          • oceanbase.DBA_SQL_MANAGEMENT_CONFIG
          • information_schema.QUERY_RESPONSE_TIME
          • oceanbase.CDB_OB_LS
          • oceanbase.DBA_OB_LS
          • oceanbase.CDB_OB_TABLE_LOCATIONS
          • oceanbase.DBA_OB_TABLE_LOCATIONS
          • oceanbase.DBA_OB_SERVER_EVENT_HISTORY
          • oceanbase.CDB_OB_FREEZE_INFO
          • oceanbase.DBA_OB_FREEZE_INFO
          • oceanbase.DBA_OB_LS_REPLICA_TASKS
          • oceanbase.CDB_OB_LS_REPLICA_TASKS
          • oceanbase.DBA_OB_AUTO_INCREMENT
          • oceanbase.CDB_OB_AUTO_INCREMENT
          • oceanbase.DBA_SEQUENCES
          • oceanbase.DBA_SCHEDULER_WINDOWS
          • oceanbase.DBA_OB_USERS
          • oceanbase.CDB_OB_USERS
          • oceanbase.DBA_OB_DATABASE_PRIVILEGE
          • oceanbase.CDB_OB_DATABASE_PRIVILEGE
          • oceanbase.DBA_OB_USER_DEFINED_RULES
          • oceanbase.CDB_OB_LS_LOG_ARCHIVE_PROGRESS
          • oceanbase.DBA_OB_LS_LOG_ARCHIVE_PROGRESS
          • oceanbase.DBA_OB_ARBITRATION_SERVICE
          • oceanbase.CDB_OB_LS_ARB_REPLICA_TASKS
          • oceanbase.DBA_OB_LS_ARB_REPLICA_TASKS
          • oceanbase.CDB_OB_LS_ARB_REPLICA_TASK_HISTORY
          • oceanbase.DBA_OB_LS_ARB_REPLICA_TASK_HISTORY
          • oceanbase.DBA_OB_CLUSTER_EVENT_HISTORY
          • oceanbase.DBA_OB_RSRC_IO_DIRECTIVES
          • oceanbase.DBA_RSRC_PLANS
          • oceanbase.DBA_RSRC_PLAN_DIRECTIVES
          • oceanbase.DBA_RSRC_GROUP_MAPPINGS
          • oceanbase.DBA_RSRC_CONSUMER_GROUPS
          • oceanbase.DBA_OB_DATA_DICTIONARY_IN_LOG
          • oceanbase.CDB_OB_DATA_DICTIONARY_IN_LOG
          • oceanbase.DBA_OB_TASK_OPT_STAT_GATHER_HISTORY
          • oceanbase.DBA_OB_TABLE_OPT_STAT_GATHER_HISTORY
          • oceanbase.CDB_OB_LOG_RESTORE_SOURCE
          • oceanbase.DBA_OB_LOG_RESTORE_SOURCE
          • oceanbase.DBA_OB_TABLE_STAT_STALE_INFO
          • oceanbase.DBA_OB_EXTERNAL_TABLE_FILES
          • oceanbase.ALL_OB_EXTERNAL_TABLE_FILES
          • oceanbase.CDB_OB_EXTERNAL_TABLE_FILES
          • oceanbase.DBA_OB_BALANCE_JOBS
          • oceanbase.CDB_OB_BALANCE_JOBS
          • oceanbase.DBA_OB_BALANCE_JOB_HISTORY
          • oceanbase.CDB_OB_BALANCE_JOB_HISTORY
          • oceanbase.DBA_OB_BALANCE_TASKS
          • oceanbase.DBA_OB_BALANCE_TASK_HISTORY
          • oceanbase.CDB_OB_BALANCE_TASKS
          • oceanbase.CDB_OB_BALANCE_TASK_HISTORY
          • oceanbase.DBA_OB_TRANSFER_TASKS
          • oceanbase.DBA_OB_TRANSFER_TASK_HISTORY
          • oceanbase.CDB_OB_TRANSFER_TASKS
          • oceanbase.CDB_OB_TRANSFER_TASK_HISTORY
          • oceanbase.CDB_OB_ACCESS_POINT
          • oceanbase.DBA_OB_ACCESS_POINT
          • oceanbase.DBA_DB_LINKS
          • oceanbase.CDB_OB_LS_HISTORY
          • oceanbase.DBA_OB_LS_HISTORY
          • oceanbase.CDB_OB_TENANT_EVENT_HISTORY
          • oceanbase.DBA_OB_TENANT_EVENT_HISTORY
        • Performance views
          • GV$OB_COMPACTION_DIAGNOSE_INFO
          • GV$OB_COMPACTION_PROGRESS
          • GV$OB_COMPACTION_SUGGESTIONS
          • GV$OB_KVCACHE
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          • GV$OB_PROCESSLIST
          • GV$OB_PX_TARGET_MONITOR
          • GV$OB_SERVERS
          • GV$OB_TABLET_COMPACTION_HISTORY
          • GV$OB_TABLET_COMPACTION_PROGRESS
          • GV$OB_TRANSACTION_PARTICIPANTS
          • GV$OB_UNITS
          • GV$OB_PLAN_CACHE_STAT
          • GV$OB_PLAN_CACHE_PLAN_STAT
          • GV$SESSION_EVENT
          • GV$SESSION_WAIT
          • GV$SESSION_WAIT_HISTORY
          • GV$SYSTEM_EVENT
          • GV$SESSTAT
          • GV$OB_IO_BENCHMARK
          • GV$OB_SQL_AUDIT
          • GV$LATCH
          • GV$OB_MEMORY
          • GV$OB_MEMSTORE
          • GV$OB_PLAN_CACHE_PLAN_EXPLAIN
          • GV$OB_RPC_OUTGOING
          • GV$OB_RPC_INCOMING
          • GV$SQL_PLAN_MONITOR
          • GV$SYSSTAT
          • GV$ACTIVE_SESSION_HISTORY
          • GV$DML_STATS
          • GV$SESSION_LONGOPS
          • GV$OB_PX_WORKER_STAT
          • GV$OB_PS_STAT
          • GV$OB_PS_ITEM_INFO
          • GV$SQL_WORKAREA
          • GV$SQL_WORKAREA_HISTOGRAM
          • GV$OB_SQL_WORKAREA_MEMORY_INFO
          • GV$OB_SERVER_SCHEMA_INFO
          • GV$OB_MERGE_INFO
          • GV$OB_SSTABLES
          • GV$OB_TENANT_MEMORY
          • V$OB_COMPACTION_DIAGNOSE_INFO
          • V$OB_COMPACTION_PROGRESS
          • V$OB_COMPACTION_SUGGESTIONS
          • V$OB_KVCACHE
          • V$OB_PARAMETERS
          • V$OB_PROCESSLIST
          • V$OB_PX_TARGET_MONITOR
          • V$OB_SERVERS
          • V$OB_TABLET_COMPACTION_HISTORY
          • V$OB_TABLET_COMPACTION_PROGRESS
          • V$OB_TRANSACTION_PARTICIPANTS
          • V$OB_UNITS
          • V$STATNAME
          • V$EVENT_NAME
          • V$SESSION_WAIT
          • V$SESSION_WAIT_HISTORY
          • V$SESSTAT
          • V$SYSTEM_EVENT
          • V$OB_MEMORY
          • V$OB_MEMSTORE
          • V$OB_PLAN_CACHE_STAT
          • V$OB_PLAN_CACHE_PLAN_STAT
          • V$OB_PLAN_CACHE_PLAN_EXPLAIN
          • V$OB_SQL_AUDIT
          • V$OB_RPC_OUTGOING
          • V$OB_RPC_INCOMING
          • V$SQL_PLAN_MONITOR
          • V$SESSION_LONGOPS
          • V$LATCH
          • V$OB_PX_WORKER_STAT
          • V$OB_PS_STAT
          • V$OB_PS_ITEM_INFO
          • V$SQL_WORKAREA
          • V$SQL_WORKAREA_ACTIVE
          • V$SQL_WORKAREA_HISTOGRAM
          • V$OB_SQL_WORKAREA_MEMORY_INFO
          • V$OB_SERVER_SCHEMA_INFO
          • V$OB_MERGE_INFO
          • V$SQL_MONITOR_STATNAME
          • V$OB_ENCRYPTED_TABLES
          • V$ENCRYPTED_TABLESPACES
          • V$OB_SSTABLES
          • V$OB_TENANT_MEMORY
          • GV$SQL_WORKAREA_ACTIVE
          • GV$OB_MEMSTORE_INFO
          • V$OB_MEMSTORE_INFO
          • GV$OB_IO_CALIBRATION_STATUS
          • V$OB_IO_CALIBRATION_STATUS
          • GV$OB_DTL_INTERM_RESULT_MONITOR
          • V$OB_IO_BENCHMARK
          • V$SYSSTAT
          • V$SESSION_EVENT
          • V$ACTIVE_SESSION_HISTORY
          • V$DML_STATS
          • GV$OB_LOG_STAT
          • V$OB_LOG_STAT
          • V$OB_DTL_INTERM_RESULT_MONITOR
          • V$OB_LS_REPLICA_TASK_PLAN
          • V$OB_ARCHIVE_DEST_STATUS
          • V$RSRC_PLAN
          • GV$OB_THREAD
          • V$OB_THREAD
          • GV$OB_ARBITRATION_SERVICE_STATUS
          • V$OB_ARBITRATION_SERVICE_STATUS
          • GV$OB_ARBITRATION_MEMBER_INFO
          • GV$OB_ARBITRATION_MEMBER_INFO
          • V$OB_ARBITRATION_MEMBER_INFO
          • GV$OB_OPT_STAT_GATHER_MONITOR
          • V$OB_OPT_STAT_GATHER_MONITOR
          • GV$OB_LOCKS
          • V$OB_LOCKS
          • V$OB_LS_LOG_RESTORE_STATUS
          • V$OB_TIMESTAMP_SERVICE
          • GV$OB_PX_P2P_DATAHUB
          • V$OB_PX_P2P_DATAHUB
          • GV$SQL_JOIN_FILTER
          • V$SQL_JOIN_FILTER
          • GV$OB_SQL_PLAN
          • V$OB_SQL_PLAN
      • MySQL tenant views
        • Dictionary views
          • information_schema.CHARACTER_SETS
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          • information_schema.COLUMN_PRIVILEGES
          • information_schema.CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS
          • information_schema.ENGINES
          • information_schema.GLOBAL_STATUS
          • information_schema.GLOBAL_VARIABLES
          • information_schema.KEY_COLUMN_USAGE
          • information_schema.PARAMETERS
          • information_schema.PARTITIONS
          • information_schema.PROCESSLIST
          • information_schema.REFERENTIAL_CONSTRAINTS
          • information_schema.ROUTINES
          • information_schema.SCHEMA_PRIVILEGES
          • information_schema.SCHEMATA
          • information_schema.SESSION_STATUS
          • information_schema.SESSION_VARIABLES
          • information_schema.STATISTICS
          • information_schema.TABLES
          • information_schema.TABLE_CONSTRAINTS
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          • information_schema.USER_PRIVILEGES
          • information_schema.VIEW_TABLE_USAGE
          • information_schema.VIEWS
          • mysql.db
          • mysql.help_category
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          • mysql.proc
          • mysql.time_zone
          • mysql.time_zone_name
          • mysql.time_zone_transition
          • mysql.time_zone_transition_type
          • mysql.user
          • oceanbase.DBA_IND_PARTITIONS
          • oceanbase.DBA_IND_SUBPARTITIONS
          • oceanbase.DBA_OB_DATABASES
          • oceanbase.DBA_OB_LS_LOCATIONS
          • oceanbase.DBA_OB_MAJOR_COMPACTION
          • oceanbase.DBA_OB_RESOURCE_POOLS
          • oceanbase.DBA_OB_ROOTSERVICE_EVENT_HISTORY
          • oceanbase.DBA_OB_SERVER_JOBS
          • oceanbase.DBA_OB_SERVERS
          • oceanbase.DBA_OB_TABLEGROUP_PARTITIONS
          • oceanbase.DBA_OB_TABLEGROUP_SUBPARTITIONS
          • oceanbase.DBA_OB_TABLEGROUP_TABLES
          • oceanbase.DBA_OB_TABLEGROUPS
          • oceanbase.DBA_OB_TABLET_REPLICAS
          • oceanbase.DBA_OB_TABLET_TO_LS
          • oceanbase.DBA_OB_TENANT_JOBS
          • oceanbase.DBA_OB_UNIT_JOBS
          • oceanbase.DBA_OB_UNIT_CONFIGS
          • oceanbase.DBA_OB_UNITS
          • oceanbase.DBA_OB_ZONE_MAJOR_COMPACTION
          • oceanbase.DBA_OB_ZONES
          • oceanbase.DBA_OBJECTS
          • oceanbase.DBA_PART_INDEXES
          • oceanbase.DBA_PART_KEY_COLUMNS
          • oceanbase.DBA_PART_TABLES
          • oceanbase.DBA_OB_SEQUENCE_OBJECTS
          • oceanbase.DBA_SUBPART_KEY_COLUMNS
          • oceanbase.DBA_SUBPARTITION_TEMPLATES
          • oceanbase.DBA_TAB_PARTITIONS
          • oceanbase.DBA_TAB_SUBPARTITIONS
          • oceanbase.CDB_IND_COLUMNS
          • oceanbase.CDB_IND_PARTITIONS
          • oceanbase.CDB_IND_SUBPARTITIONS
          • oceanbase.CDB_INDEXES
          • oceanbase.CDB_OB_ARCHIVELOG_PIECE_FILES
          • oceanbase.CDB_OB_DATABASES
          • oceanbase.CDB_OB_LS_LOCATIONS
          • oceanbase.CDB_OB_MAJOR_COMPACTION
          • oceanbase.CDB_OB_RESTORE_HISTORY
          • oceanbase.CDB_OB_RESTORE_PROGRESS
          • oceanbase.CDB_OB_TABLEGROUP_PARTITIONS
          • oceanbase.CDB_OB_TABLEGROUP_SUBPARTITIONS
          • oceanbase.CDB_OB_TABLEGROUP_TABLES
          • oceanbase.CDB_OB_TABLEGROUPS
          • oceanbase.CDB_OB_TABLET_REPLICAS
          • oceanbase.CDB_OB_TABLET_TO_LS
          • oceanbase.CDB_OB_ZONE_MAJOR_COMPACTION
          • oceanbase.CDB_OBJECTS
          • oceanbase.CDB_PART_INDEXES
          • oceanbase.CDB_PART_KEY_COLUMNS
          • oceanbase.CDB_PART_TABLES
          • oceanbase.CDB_SUBPART_KEY_COLUMNS
          • oceanbase.CDB_SUBPARTITION_TEMPLATES
          • oceanbase.CDB_TAB_COL_STATISTICS
          • oceanbase.CDB_TAB_COLS
          • oceanbase.CDB_TAB_COLS_V$
          • oceanbase.CDB_TAB_PARTITIONS
          • oceanbase.CDB_TAB_SUBPARTITIONS
          • oceanbase.CDB_TABLES
          • oceanbase.CDB_OB_BACKUP_SET_FILES
          • oceanbase.DBA_OB_BACKUP_SET_FILES
          • oceanbase.CDB_OB_BACKUP_JOBS
          • oceanbase.DBA_OB_BACKUP_JOBS
          • oceanbase.CDB_OB_BACKUP_JOB_HISTORY
          • oceanbase.DBA_OB_BACKUP_JOB_HISTORY
          • oceanbase.CDB_OB_BACKUP_TASKS
          • oceanbase.DBA_OB_BACKUP_TASKS
          • oceanbase.CDB_OB_BACKUP_TASK_HISTORY
          • oceanbase.DBA_OB_BACKUP_TASK_HISTORY
          • oceanbase.DBA_OB_ARCHIVELOG_PIECE_FILES
          • oceanbase.DBA_OB_RESTORE_PROGRESS
          • oceanbase.DBA_OB_RESTORE_HISTORY
          • oceanbase.CDB_OB_ARCHIVE_DEST
          • oceanbase.DBA_OB_ARCHIVE_DEST
          • oceanbase.CDB_OB_ARCHIVELOG
          • oceanbase.DBA_OB_ARCHIVELOG
          • oceanbase.CDB_OB_ARCHIVELOG_SUMMARY
          • oceanbase.DBA_OB_ARCHIVELOG_SUMMARY
          • oceanbase.CDB_OB_BACKUP_PARAMETER
          • oceanbase.DBA_OB_BACKUP_PARAMETER
          • oceanbase.DBA_OB_OUTLINE_CONCURRENT_HISTORY
          • oceanbase.DBA_OB_OUTLINES
          • oceanbase.DBA_OB_CONCURRENT_LIMIT_SQL
          • oceanbase.CDB_OB_SYS_VARIABLES
          • oceanbase.CDB_OB_BACKUP_DELETE_JOBS
          • oceanbase.DBA_OB_BACKUP_DELETE_JOBS
          • oceanbase.CDB_OB_BACKUP_DELETE_JOB_HISTORY
          • oceanbase.DBA_OB_BACKUP_DELETE_JOB_HISTORY
          • oceanbase.CDB_OB_BACKUP_DELETE_TASKS
          • oceanbase.DBA_OB_BACKUP_DELETE_TASKS
          • oceanbase.CDB_OB_BACKUP_DELETE_TASK_HISTORY
          • oceanbase.DBA_OB_BACKUP_DELETE_TASK_HISTORY
          • oceanbase.CDB_OB_BACKUP_STORAGE_INFO
          • oceanbase.DBA_OB_BACKUP_STORAGE_INFO
          • oceanbase.CDB_OB_BACKUP_STORAGE_INFO_HISTORY
          • oceanbase.DBA_OB_BACKUP_STORAGE_INFO_HISTORY
          • oceanbase.CDB_OB_BACKUP_DELETE_POLICY
          • oceanbase.DBA_OB_BACKUP_DELETE_POLICY
          • oceanbase.CDB_OB_DEADLOCK_EVENT_HISTORY
          • oceanbase.DBA_OB_DEADLOCK_EVENT_HISTORY
          • oceanbase.CDB_OB_COLUMN_CHECKSUM_ERROR_INFO
          • oceanbase.CDB_OB_TABLET_CHECKSUM_ERROR_INFO
          • oceanbase.DBA_TAB_STATISTICS
          • oceanbase.DBA_TAB_COL_STATISTICS
          • oceanbase.DBA_PART_COL_STATISTICS
          • oceanbase.DBA_SUBPART_COL_STATISTICS
          • oceanbase.DBA_TAB_HISTOGRAMS
          • oceanbase.DBA_PART_HISTOGRAMS
          • oceanbase.DBA_SUBPART_HISTOGRAMS
          • oceanbase.DBA_TAB_STATS_HISTORY
          • oceanbase.DBA_SCHEDULER_JOBS
          • oceanbase.DBA_IND_STATISTICS
          • oceanbase.DBA_TAB_MODIFICATIONS
          • oceanbase.DBA_SQL_PLAN_BASELINES
          • oceanbase.DBA_SQL_MANAGEMENT_CONFIG
          • information_schema.QUERY_RESPONSE_TIME
          • oceanbase.CDB_OB_LS
          • oceanbase.DBA_OB_LS
          • oceanbase.CDB_OB_TABLE_LOCATIONS
          • oceanbase.DBA_OB_TABLE_LOCATIONS
          • oceanbase.DBA_OB_SERVER_EVENT_HISTORY
          • oceanbase.CDB_OB_FREEZE_INFO
          • oceanbase.DBA_OB_FREEZE_INFO
          • oceanbase.DBA_OB_LS_REPLICA_TASKS
          • oceanbase.CDB_OB_LS_REPLICA_TASKS
          • oceanbase.DBA_OB_AUTO_INCREMENT
          • oceanbase.CDB_OB_AUTO_INCREMENT
          • oceanbase.DBA_SEQUENCES
          • oceanbase.DBA_SCHEDULER_WINDOWS
          • oceanbase.DBA_OB_USERS
          • oceanbase.CDB_OB_USERS
          • oceanbase.DBA_OB_DATABASE_PRIVILEGE
          • oceanbase.CDB_OB_DATABASE_PRIVILEGE
          • oceanbase.DBA_OB_USER_DEFINED_RULES
          • oceanbase.DBA_OB_TENANTS
          • oceanbase.CDB_OB_LS_LOG_ARCHIVE_PROGRESS
          • oceanbase.DBA_OB_LS_LOG_ARCHIVE_PROGRESS
          • oceanbase.CDB_OB_LS_ARB_REPLICA_TASKS
          • oceanbase.DBA_OB_LS_ARB_REPLICA_TASKS
          • oceanbase.CDB_OB_LS_ARB_REPLICA_TASK_HISTORY
          • oceanbase.DBA_OB_LS_ARB_REPLICA_TASK_HISTORY
          • information_schema.ST_GEOMETRY_COLUMNS
          • information_schema.ST_SPATIAL_REFERENCE_SYSTEMS
          • oceanbase.DBA_OB_CLUSTER_EVENT_HISTORY
          • oceanbase.DBA_OB_RSRC_IO_DIRECTIVES
          • oceanbase.DBA_RSRC_PLANS
          • oceanbase.DBA_RSRC_PLAN_DIRECTIVES
          • oceanbase.DBA_RSRC_GROUP_MAPPINGS
          • oceanbase.DBA_RSRC_CONSUMER_GROUPS
          • oceanbase.DBA_OB_DATA_DICTIONARY_IN_LOG
          • oceanbase.CDB_OB_DATA_DICTIONARY_IN_LOG
          • oceanbase.DBA_OB_TASK_OPT_STAT_GATHER_HISTORY
          • oceanbase.DBA_OB_TABLE_OPT_STAT_GATHER_HISTORY
          • oceanbase.CDB_OB_LOG_RESTORE_SOURCE
          • oceanbase.DBA_OB_LOG_RESTORE_SOURCE
          • oceanbase.DBA_OB_TABLE_STAT_STALE_INFO
          • oceanbase.DBA_OB_EXTERNAL_TABLE_FILES
          • oceanbase.ALL_OB_EXTERNAL_TABLE_FILES
          • oceanbase.CDB_OB_EXTERNAL_TABLE_FILES
          • oceanbase.DBA_OB_BALANCE_JOBS
          • oceanbase.CDB_OB_BALANCE_JOBS
          • oceanbase.DBA_OB_BALANCE_JOB_HISTORY
          • oceanbase.CDB_OB_BALANCE_JOB_HISTORY
          • oceanbase.DBA_OB_BALANCE_TASKS
          • oceanbase.DBA_OB_BALANCE_TASK_HISTORY
          • oceanbase.CDB_OB_BALANCE_TASKS
          • oceanbase.CDB_OB_BALANCE_TASK_HISTORY
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          • oceanbase.DBA_OB_TENANT_EVENT_HISTORY
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      • Common statistics events
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          • location_cache_refresh_rpc_timeout
          • location_cache_refresh_sql_timeout
          • location_fetch_concurrency
          • location_refresh_thread_count
          • log_archive_batch_buffer_limit
          • log_archive_checkpoint_interval
          • max_kept_major_version_number
          • max_px_worker_count
          • max_string_print_length
          • max_syslog_file_count
          • memory_chunk_cache_size
          • memory_limit
          • memory_limit_percentage
          • memory_reserved
          • memstore_limit_percentage
          • merge_stat_sampling_ratio
          • merge_thread_count
          • merger_completion_percentage
          • merger_switch_leader_duration_time
          • merger_warm_up_duration_time
          • micro_block_merge_verify_level
          • migrate_concurrency
          • migration_disable_time
          • min_observer_version
          • minor_deferred_gc_time
          • mysql_port
          • net_thread_count
          • ob_event_history_recycle_interval
          • ob_ratelimit_stat_period
          • obconfig_url
          • tablet_meta_table_check_interval
          • tablet_meta_table_scan_batch_count
          • plan_cache_evict_interval
          • plan_cache_high_watermark
          • plan_cache_low_watermark
          • px_task_size
          • px_workers_per_cpu_quota
          • rdma_io_thread_count
          • recyclebin_object_expire_time
          • ls_meta_table_check_interval
          • resource_hard_limit
          • rebuild_replica_data_lag_threshold
          • rootservice_async_task_queue_size
          • rootservice_async_task_thread_count
          • rootservice_list
          • rootservice_memory_limit
          • rootservice_ready_check_interval
          • row_compaction_update_limit
          • rpc_port
          • rpc_timeout
          • schema_history_expire_time
          • schema_history_recycle_interval
          • server_balance_cpu_mem_tolerance_percent
          • server_balance_critical_disk_waterlevel
          • server_balance_disk_tolerance_percent
          • server_check_interval
          • server_cpu_quota_max
          • server_cpu_quota_min
          • server_permanent_offline_time
          • server_data_copy_out_concurrency
          • server_data_copy_in_concurrency
          • ssl_client_authentication
          • ssl_external_kms_info
          • stack_size
          • sql_audit_memory_limit
          • sys_bkgd_migration_change_member_list_timeout
          • sys_bkgd_migration_retry_num
          • sys_bkgd_net_percentage
          • switchover_process_thread_count
          • syslog_io_bandwidth_limit
          • sys_bkgd_io_high_percentage
          • syslog_level
          • sys_bkgd_io_low_percentage
          • sys_cpu_limit_trigger
          • system_memory
          • system_trace_level
          • tableapi_transport_compress_func
          • tablet_size
          • tcp_keepcnt
          • system_cpu_quota
          • tcp_keepidle
          • tcp_keepintvl
          • tenant_cpu_variation_per_server
          • tenant_task_queue_size
          • token_reserved_percentage
          • trace_log_sampling_interval
          • trace_log_slow_query_watermark
          • trx_2pc_retry_interval
          • tenant_groups
          • use_large_pages
          • user_block_cache_priority
          • trx_force_kill_threshold
          • user_row_cache_priority
          • trx_try_wait_lock_timeout
          • unit_balance_resource_weight
          • virtual_table_location_cache_expire_time
          • weak_read_version_refresh_interval
          • user_iort_up_percentage
          • workers_per_cpu_quota
          • zone
          • user_tab_col_stat_cache_priority
          • wait_leader_batch_count
          • log_disk_size
          • log_disk_percentage
          • tablet_ls_cache_priority
          • opt_tab_stat_cache_priority
          • zone_merge_concurrency
          • index_block_cache_priority
          • zone_merge_order
          • sql_login_thread_count
          • zone_merge_timeout
          • enable_asan_for_memory_context
          • ob_esi_rpc_port
          • enable_cgroup
          • enable_ob_esi_process
          • diag_syslog_per_error_limit
          • ob_esi_session_timeout
          • ob_esi_io_concurrency
          • ob_startup_mode
          • ob_esi_memory_limit
          • log_storage_warning_tolerance_time
          • ob_esi_syslog_level
          • ob_esi_max_syslog_file_count
          • sql_net_thread_count
          • minor_freeze_times
          • minor_merge_concurrency
          • minor_warm_up_duration_time
          • multiblock_read_gap_size
          • multiblock_read_size
          • ofs_list
          • partition_table_check_interval
          • replica_safe_remove_time
          • resource_soft_limit
          • restore_concurrency
          • rpc_client_authentication_method
          • rpc_server_authentication_method
          • row_purge_thread_count
          • datafile_maxsize
          • datafile_next
          • standby_fetch_log_bandwidth_limit
          • local_ip
          • observer_id
          • storage_meta_cache_priority
        • Tenant-level parameters
          • audit_sys_operations
          • audit_trail
          • clog_max_unconfirmed_log_count
          • clog_persistence_compress_func
          • connection_control_failed_connections_threshold
          • connection_control_min_connection_delay
          • connection_control_max_connection_delay
          • enable_clog_persistence_compress
          • enable_early_lock_release
          • enable_monotonic_weak_read
          • external_kms_info
          • enable_sql_extension
          • default_progressive_merge_num
          • io_category_config
          • log_disk_utilization_limit_threshold
          • log_disk_utilization_threshold
          • major_compact_trigger
          • compaction_low_thread_score
          • max_stale_time_for_weak_consistency
          • compaction_high_thread_score
          • minor_compact_trigger
          • compaction_mid_thread_score
          • ob_enable_batched_multi_statement
          • ob_proxy_readonly_transaction_routing_policy
          • ob_ssl_invited_common_names
          • open_cursors
          • plsql_code_type
          • plsql_debug
          • plsql_optimize_level
          • plsql_warnings
          • sql_work_area
          • tde_method
          • writing_throttling_maximum_duration
          • writing_throttling_trigger_percentage
          • workarea_size_policy
          • plsql_v2_compatibility
          • job_queue_processes
          • ha_high_thread_score
          • ha_mid_thread_score
          • ha_low_thread_score
          • ob_compaction_schedule_interval
          • default_auto_increment_mode
          • ob_query_switch_leader_retry_timeout
          • default_enable_extended_rowid
          • major_freeze_duty_time
          • undo_retention
          • query_response_time_stats
          • query_response_time_flush
          • query_response_time_range_base
          • merger_check_interval
          • freeze_trigger_percentage
          • cpu_quota_concurrency
          • arbitration_timeout
          • compatible
          • log_transport_compress_all
          • log_transport_compress_func
          • rpc_memory_limit_percentage
          • tenant_sql_login_thread_count
          • tenant_sql_net_thread_count
          • dump_data_dictionary_to_log_interval
          • enable_user_defined_rewrite_rules
          • partition_balance_schedule_interval
          • log_disk_throttling_percentage
          • enable_rebalance
          • balancer_idle_time
          • log_disk_throttling_maximum_duration
          • ls_gc_delay_time
          • standby_db_preferred_upstream_log_region
          • archive_lag_target
          • range_optimizer_max_mem_size
          • log_restore_concurrency
          • log_archive_concurrency
          • standby_db_fetch_log_rpc_timeout
      • System variables
        • System variable summary
        • Global variables
          • auto_increment_cache_size
          • auto_increment_increment
          • auto_increment_offset
          • autocommit
          • binlog_row_image
          • block_encryption_mode
          • character_set_client
          • character_set_connection
          • character_set_database
          • character_set_filesystem
          • character_set_results
          • character_set_server
          • character_set_system
          • collation_connection
          • collation_database
          • collation_server
          • connect_timeout
          • cursor_sharing
          • datadir
          • debug_sync
          • default_password_lifetime
          • div_precision_increment
          • error_on_overlap_time
          • explicit_defaults_for_timestamp
          • foreign_key_checks
          • group_concat_max_len
          • identity
          • init_connect
          • innodb_strict_mode
          • interactive_timeout
          • license
          • lower_case_table_names
          • max_allowed_packet
          • max_connections
          • max_sp_recursion_depth
          • max_user_connections
          • net_buffer_length
          • net_read_timeout
          • net_write_timeout
          • nls_calendar
          • nls_characterset
          • nls_comp
          • nls_currency
          • nls_date_format
          • nls_date_language
          • nls_dual_currency
          • nls_iso_currency
          • nls_length_semantics
          • nls_nchar_characterset
          • nls_nchar_conv_excp
          • nls_numeric_characters
          • nls_sort
          • nls_territory
          • nls_timestamp_format
          • nls_timestamp_tz_format
          • ob_bnl_join_cache_size
          • ob_create_table_strict_mode
          • ob_default_replica_num
          • ob_compatibility_mode
          • ob_enable_blk_nestedloop_join
          • ob_early_lock_release
          • ob_enable_hash_group_by
          • ob_enable_aggregation_pushdown
          • ob_enable_index_direct_select
          • ob_enable_jit
          • ob_enable_plan_cache
          • ob_enable_sql_audit
          • ob_enable_transformation
          • ob_enable_transmission_checksum
          • ob_enable_truncate_flashback
          • ob_global_debug_sync
          • ob_log_level
          • ob_pl_block_timeout
          • ob_plan_cache_evict_high_percentage
          • ob_plan_cache_evict_low_percentage
          • ob_plan_cache_percentage
          • ob_proxy_global_variables_version
          • ob_query_timeout
          • ob_read_consistency
          • ob_reserved_meta_memory_percentage
          • ob_route_policy
          • ob_sql_audit_percentage
          • ob_sql_work_area_percentage
          • ob_tcp_invited_nodes
          • ob_temp_tablespace_size_percentage
          • ob_timestamp_service
          • ob_trx_idle_timeout
          • ob_trx_lock_timeout
          • ob_trx_timeout
          • optimizer_capture_sql_plan_baselines
          • optimizer_use_sql_plan_baselines
          • parallel_max_servers
          • parallel_servers_target
          • performance_schema
          • plugin_dir
          • query_cache_size
          • query_cache_type
          • read_only
          • recyclebin
          • resource_manager_plan
          • secure_file_priv
          • sql_auto_is_null
          • sql_mode
          • sql_quote_show_create
          • sql_safe_updates
          • sql_select_limit
          • sql_throttle_current_priority
          • sql_throttle_network
          • sql_throttle_priority
          • sql_throttle_rt
          • sql_warnings
          • system_time_zone
          • time_zone
          • transaction_isolation
          • transaction_read_only
          • tx_isolation
          • tx_read_only
          • version
          • version_comment
          • wait_timeout
          • validate_password_check_user_name
          • validate_password_length
          • validate_password_mixed_case_count
          • validate_password_number_count
          • validate_password_policy
          • validate_password_special_char_count
          • server_uuid
          • default_storage_engine
          • ob_enable_rich_error_msg
          • cte_max_recursion_depth
          • regexp_stack_limit
          • event_scheduler
          • regexp_time_limit
          • log_row_value_options
          • ob_max_read_stale_time
          • parallel_degree_policy
          • parallel_degree_limit
          • parallel_min_scan_time_threshold
          • optimizer_dynamic_sampling
          • runtime_filter_type
          • runtime_filter_wait_time_ms
          • runtime_filter_max_in_num
          • runtime_bloom_filter_max_size
        • Session-level variables
          • is_result_accurate
          • last_insert_id
          • nls_language
          • ob_capability_flag
          • ob_enable_show_trace
          • ob_last_schema_version
          • ob_org_cluster_id
          • ob_proxy_partition_hit
          • ob_proxy_set_trx_executed
          • ob_trace_info
          • timestamp
          • tracefile_identifier
          • ob_max_read_stale_time
          • parallel_degree_policy
          • parallel_degree_limit
          • parallel_min_scan_time_threshold
          • optimizer_dynamic_sampling
          • runtime_filter_type
          • runtime_filter_wait_time_ms
          • runtime_filter_max_in_num
          • runtime_bloom_filter_max_size
    • Error codes
      • MySQL mode
        • Overview
        • 0001 - 3999
        • 4000 - 4499
        • 4500 - 4999
        • 5000 - 5999
        • 6000 - 6999
        • 7000 - 7999
        • 8000 - 8999
        • 9000 - 9499
        • 9500 - 9999
        • 22998, 30926, 38104, and 38105
      • Oracle mode
        • Overview
        • ORA-00000 to ORA-00999
        • ORA-01000 to ORA-01499
        • ORA-01500 to ORA-01999
        • ORA-02000 to ORA-04999
        • ORA-05000 to ORA-10000
        • ORA-10000 to ORA-19999
        • ORA-20000 to ORA-29999
        • ORA-30000 to ORA-49999
        • ORA-50000 to ORA-99999
        • PLS-00000 to PLS-00999
    • Performance tuning
      • Overview
      • Performance related tools
        • System tools
          • General tool Top
          • CPU tools
          • Memory tools
          • Disk I/O tools
          • Network tools
        • Internal tables
          • GV$SYSSTAT
          • GV$OB_SQL_AUDIT
          • GV$OB_TRANSACTION_PARTICIPANTS
        • Logs
          • slow trans
          • dump tenant info
          • trace log
        • OCP
      • System tuning
        • OS parameter tuning
        • Database parameter tuning
          • CPU parameters
          • I/O parameters
          • Memory-related parameters
          • Network transmission parameters
        • ODP parameter tuning
          • CPU parameters
          • Network transmission parameters
          • Route parameters on nodes
      • Business model tuning
        • Load Balancer
        • SQL Diagnostics
        • Distributed transactions
      • Performance diagnosis
        • Monitor and diagnose the cluster performance
        • Diagnose tenant performance
        • Monitor OBProxy performance
        • Monitor host performance
        • ASH report
          • ASH
          • Generate ASH reports
          • Analyze ASH reports
      • SQL tuning
        • SQL request execution process
        • SQL execution plans
          • Introduction to SQL execution plans
          • Execution plan operators
            • TABLE SCAN
            • JOIN
            • COUNT
            • GROUP BY
            • WINDOW FUNCTION
            • SUBPLAN FILTER
            • DISTINCT
            • SEQUENCE
            • MATERIAL
            • SORT
            • LIMIT
            • FOR UPDATE
            • SELECT INTO
            • SUBPLAN SCAN
            • UNION
            • INTERSECT
            • EXCEPT/MINUS
            • INSERT
            • DELETE
            • UPDATE
            • MERGE
            • EXCHANGE
            • GI
          • Plan cache
          • Fast parameterization
          • Display real-time execution plans
          • SQL optimization practice with EXPLAIN
        • Distributed execution plans
          • Perform distributed execution and parallel queries
          • Generate a distributed plan
          • Schedule distributed execution plans
          • Manage distributed execution plans
          • Enable parallel execution and set the degree of parallelism
          • Auto DOP
          • Execute parallel queries
          • Perform parameter tuning for a parallel query
          • Parallel DML
        • SQL tuning
          • Overview of SQL tuning
          • General procedure of SQL tuning
          • SQL execution performance monitoring
            • GV$OB_SQL_AUDIT
            • SQL Trace
            • Plan cache views
            • SQL performance analysis example
              • Use SQL Audit to analyze wait events in a query
              • Analyze SQL queries that cause an abrupt RT jitter
              • View and analyze the shape of an execution plan
              • Analyze slow SQL queries
              • Query the distribution of SQL traffic and QPS among OBServer nodes
              • Check whether SQL queries are balanced across servers in a cluster
              • Find the TOP N SQL queries
              • Analyze whether an unusually large number of remote execution requests exist in the system or the execution of an SQL statement
              • Find full table scan SQL statements in a tenant
              • Find the TOP N queries with the longest execution time within a specified period
              • Analyze queries related to distributed plans
              • Check whether the RPC execution count of a distributed subplan is balanced across servers in a cluster
          • Optimizer statistics
            • Overview of statistics
            • Statistics collection methods
              • Overview
              • Histograms
              • Manual statistics collection
              • Automatic statistics collection
              • Online statistics collection
              • Dynamic sampling
            • Statistics management
              • Overview
              • Deletion
              • Setting
              • Import and export
              • Locking and unlocking
              • History management
              • Statistics preference management
            • Monitoring and diagnostics for statistics collection
            • Examples
          • Query rewrite
            • Overview
            • Rule-based query rewriting
            • Cost-based query rewrite
          • Query optimization
            • Access path
              • Overview
              • Rule-based path selection
              • Cost-based path selection
            • Join algorithm
              • Overview
              • Join algorithms
              • Runtime filter
              • Join order
          • Manage execution plans
            • Optimizer hints
            • Plan binding
            • SQL plan management
        • Glossary
        • General issues in SQL tuning
    • Performance test
      • Run the TPC-H benchmark on OceanBase Database
      • TPC-H benchmark report of OceanBase Database
      • Run the Sysbench benchmark on OceanBase Database
      • Sysbench benchmark report of OceanBase Database
      • Achieve high performance with Sysbench on OceanBase Database: deployment and troubleshooting
      • Run the TPC-C benchmark on OceanBase Database
      • TPC-C benchmark report of OceanBase Database
    • Database proxy
      • OceanBase Database Proxy
      • Overview
      • ODP
        • Overview
        • Manage ODP clusters
          • Create an ODP cluster
          • Manage ODP cluster parameters
          • Delete an ODP cluster
          • Upgrade all ODPs in an ODP cluster
          • Restart all ODPs in an ODP cluster
          • Manage OceanBase clusters connected to an ODP cluster
          • Monitor ODP cluster performance
        • Manage ODP
          • Add an ODP
          • Start an ODP
          • Refresh ODP configurations
          • Stop an ODP
          • Restart an ODP
          • Delete an ODP
          • Upgrade one or more ODPs
        • ODP startup parameters
      • Physical connections
      • Logical connection
        • Query all sessions
        • Query the details of a session
        • Query the metrics of a session
        • Query session variables
        • Terminate a server session
      • Route management
        • Table-based routing of ODP
        • LDC-based routing
        • ODP routing policy
          • Read/Write splitting
          • Follower-first read
          • Blocklist mechanism
          • Transaction routing
      • View tenant sessions
      • Terminate a tenant session
      • Set the maximum number of connections for a tenant
    • Drivers
      • ECOB
      • OBCI
      • OceanBase Connector/J
      • OceanBase Connector/C
      • OceanBase Connector/ODBC
    • Platforms
      • OMA
      • OMS
      • OCP
      • ODC
      • OAT
    • Components & tools
      • O&M management
        • ob_admin
          • Overview
          • clog
            • log_tool
            • Format of clogs
            • Transaction logs
          • dumpsst
          • dump_backup
        • ob_error
        • OBD
        • ob-operator
          • Overview
          • Quick start
          • Deploy ob-operator
          • Upgrade ob-operator
          • User guide
            • Manage clusters
              • Create a cluster
              • Scale out clusters
                • Add zones to a cluster
                • Add OBServer nodes to zones
              • Scale in clusters
                • Delete zones from a cluster
                • Delete OBServer nodes from zones
              • Delete a cluster
              • Upgrade a cluster
            • Manage tenants
              • Create a tenant
              • Modify tenants
                • Manage resources
                • Manage replicas
                • Modify other parameters
              • Delete a tenant
            • Backup and restore
              • Back up a cluster
              • Back up a tenant
              • Restore data from a backup
      • Monitoring and diagnostics
        • obdiag
        • SQL diagnoser
          • Overview
          • Deploy and use SQL diagnoser
            • Install SQL Diagnoser
            • Use SQL Diagnoser
          • SQL diagnoser remarks
            • Built-in diagnostic items
            • Diagnostic rule expression
            • APIs
            • Diagnostic items of SQL review
        • DOOBA
      • Data integration
        • OBLOADER & OBDUMPER
        • Partition calculator
          • Overview
          • Use the ob-partition-calculator component
        • CDC
          • Overview
          • obcdc
            • Deploy and use obcdc
              • Install and deploy obcdc
              • obcdc development instructions
              • obcdc_tailf
            • obcdc parameters
              • General obcdc parameters
              • obcdc parameters
            • FAQ about obcdc
          • oblogproxy
            • Deploy oblogproxy
              • Install and deploy oblogproxy by using the installation package
              • Build oblogproxy by using the source code
            • Configuration files
          • oblogmsg
            • Install and deploy oblogmsg
            • Description of some oblogmsg APIs
      • Stress testing tools
        • mysqltest
          • Use obd.sh to run mysqltest
          • Use of cases
            • Add a test case
            • Test case writing conventions
            • General test case writing commands
  • FAQ
    • FAQs
    • SQL statements
    • Deployment
    • Cluster management
    • High availability
  • Release Notes
    • Version rules
    • OceanBase Database Enterprise Edition
      • V4.2
        • OceanBase Database Enterprise Edition V4.2.0
      • V4.1
        • OceanBase Database Enterprise Edition V4.1.0
      • V3.2
        • OceanBase Database Enterprise Edition V3.2.4
        • OceanBase Database Enterprise Edition V3.2.3
        • OceanBase Database Enterprise Edition V3.2.2
        • OceanBase Database Enterprise Edition V3.2.1
        • OceanBase Database Enterprise Edition V3.2.0
      • V3.1
        • OceanBase Database Enterprise Edition V3.1.2
        • OceanBase Database Enterprise Edition V3.1.1
      • V2.2
        • OceanBase Database Enterprise Edition V2.2.77
        • OceanBase Database Enterprise Edition V2.2.76
        • OceanBase Database Enterprise Edition V2.2.30
    • OceanBase Database Community Edition
      • V4.2
        • OceanBase Database Community Edition V4.2.0
      • V4.1
        • OceanBase Database Community Edition V4.1.0
      • V4.0
        • OceanBase Database Community Edition V4.0.0
      • V3.1
        • OceanBase Database Community Edition V3.1.5
        • OceanBase Database Community Edition V3.1.4
        • OceanBase Database Community Edition V3.1.3
        • OceanBase Database Community Edition V3.1.2
        • OceanBase Database Community Edition V3.1.1
  • Glossary

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Overview Differences between the Enterprise Edition and the Community Edition System architecture Overview SQL data types Built-in functions System views Compatibility with MySQL Limitations Get started with OceanBase Database Before you begin Basic SQL operations (MySQL mode) Basic SQL operations (Oracle mode) Build a Python application Build a Java application Build a C application Build a Go application Build a Java application Build a C application Try out operational OLAP Try out parallel import and data compression Try out the multi-tenant feature Video tutorials Overview High availability deployment solutions for OceanBase clusters Deployment process Overview Deploy OceanBase Database in a Kubernetes cluster Clear out an old cluster Overview Use OMS to migrate data from a MySQL database to a MySQL tenant of OceanBase Database Use mydumper and myloader to migrate data from a MySQL database to OceanBase Database Use DBCAT to migrate schemas from a MySQL database to OceanBase Database Use DataX to migrate table data from a MySQL database to OceanBase Database Use CloudCanal to migrate data from a MySQL database to OceanBase Database Use Canal to synchronize data from a MySQL database to OceanBase Database Use Flink CDC to synchronize data from a MySQL database to OceanBase Database Use ChunJun to migrate data from a MySQL database to OceanBase Database Use OMS to migrate data from a MySQL tenant of OceanBase Database to a MySQL database Use OMS to migrate incremental data from an Oracle tenant of OceanBase Database to a MySQL database Use DBCAT to migrate schemas from OceanBase Database to a MySQL database Use DataX to migrate table data from OceanBase Database to a MySQL database Synchronize data from OceanBase Database to a MySQL database using Canal Migrate data from a MySQL OceanBase database to a MySQL database using CloudCanal Use Flink CDC to migrate data from OceanBase Database to a MySQL database Migrate data from a MySQL database in OceanBase Database to a MySQL database using ChunJun Use OMS to migrate data from an Oracle database to a MySQL tenant of OceanBase Database Use OMS to migrate data from an Oracle database to an Oracle tenant of OceanBase Database Use DBCAT to migrate schemas from an Oracle database to OceanBase Database Use DataX to migrate table data from an Oracle database to OceanBase Database Use OMS to migrate data from an Oracle tenant of OceanBase Database to an Oracle database Use DBCAT to migrate schemas from OceanBase Database to an Oracle database Use DataX to migrate table data from OceanBase Database to an Oracle database Use OMS to migrate data from a DB2 LUW database to a MySQL tenant of OceanBase Database Use OMS to migrate data from a DB2 LUW database to an Oracle tenant of OceanBase Database Use DBCAT to migrate table schemas from a DB2 LUW database to OceanBase Database Use OMS to migrate data from a MySQL tenant of OceanBase Database to a DB2 LUW database Use OMS to migrate data from an Oracle tenant of OceanBase Database to a DB2 LUW database Use OMS to migrate data from a TiDB database to a MySQL tenant of OceanBase Database Use OMS to migrate data from a PostgreSQL database to a MySQL tenant of OceanBase Database Use DataX to migrate CSV files to OceanBase Database Import data by using the LOAD DATA statement Import data from SQL files to OceanBase Database Use OMS to migrate data from an OceanBase Database tenant to another of the same type Use OMS to migrate data from an OceanBase Database tenant to another of the same type in active-active disaster recovery scenarios Use OBLOADER & OBDUMPER to migrate data between MySQL tenants in OceanBase Database Use OBLOADER & OBDUMPER to migrate data from a MySQL tenant to an Oracle tenant in OceanBase Database Use OBLOADER & OBDUMPER to migrate data between Oracle tenants in OceanBase Database Use OBLOADER & OBDUMPER to migrate data from an Oracle tenant to a MySQL tenant in OceanBase Database Migrate data between tables Migrate resource units Export data by using OUTFILE statements Overview of direct load Import data in bypass mode by using the LOAD DATA statement Import data in bypass mode by using the INSERT INTO SELECT statement Log on to an OceanBase Database tenant Overview Cluster parameters Tenants Tenant capacity Tenant types User tenants System variables of a tenant Overview Traffic distribution Data distribution Overview Flashback queries Overview Introduction to physical backup and restore Deploy NFS Overview Cases Overview Log levels Log stability Log control Log metrics Overview Check cluster parameters
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4500 - 4999

Last Updated:2023-12-01 03:27:20  Updated
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What is on this page
ERROR 4507 (42000): Convert error
ERROR 4512 (HY000): RootServer state error
ERROR 4515 (HY000): No replica is valid
ERROR 4519 (HY000): Iteration was stopped
ERROR 4530 (HY000): Zone info \'%s\' not exist
ERROR 4544 (42000): Root not integrated
ERROR 4547 (HY000): global merge not started
ERROR 4548 (HY000): merge already started
ERROR 4549 (HY000): rootservice already exist
ERROR 4550 (HY000): rootservice is shutdown
ERROR 4551 (HY000): server migrate in denied
ERROR 4552 (HY000): rebalance task can not executing now
ERROR 4554 (HY000): rebalance task not in progress on observer
ERROR 4605 (HY000): Data source timeout
ERROR 4615 (HY000): tablegroup is not empty
ERROR 4620 (HY000): server status is not valid
ERROR 4621 (HY000): wait elect partition leader timeout
ERROR 4622 (HY000): wait all rs online timeout
ERROR 4624 (HY000): zone '%s' server '%s' %s resource is not enough to hold a new unit
ERROR 4626 (HY000): resource pool \'%s\' has already been granted to a tenant
ERROR 4628 (HY000): server has already been deleted
ERROR 4629 (HY000): server is not in deleting status
ERROR 4630 (HY000): server not in server white list
ERROR 4631 (HY000): server zone not match
ERROR 4632 (HY000): zone num has reach max zone num
ERROR 4633 (HY000): zone status not match
ERROR 4634 (HY000): resource unit \'%s\' is referenced by some resource pool
ERROR 4636 (HY000): table schema primary zone different with other table in same tablegroup
ERROR 4637 (HY000): server is not active
ERROR 4638 (HY000): The RootServer is not the master
ERROR 4640 (HY000): The chosen partition servers belong to same zone
ERROR 4641 (HY000): Duplicated zone \'%s\' in zone list %s
ERROR 4646 (HY000): tenant name \'%s\' over max_tenant_name_length %ld
ERROR 4647 (HY000): resource pool list is empty
ERROR 4648 (HY000): resource unit \'%s\' not exist
ERROR 4649 (HY000): resource unit \'%s\' already exist
ERROR 4650 (HY000): resource pool \'%s\' not exist
ERROR 4651 (HY000): resource pool \'%s\' exist
ERROR 4652 (HY000): wait leader switch timeout
ERROR 4653 (HY000): location not exist
ERROR 4654 (HY000): location leader not exist
ERROR 4655 (HY000): zone not active
ERROR 4656 (HY000): resource pool unit num is bigger than zone server count
ERROR 4657 (HY000): resource pool list %s unit servers intersect
ERROR 4659 (HY000): invalid %s value, min value is %s
ERROR 4660 (HY000): Can not stop server in multiple zones, there are already servers stopped in zone:%s
ERROR 4661 (HY000): Session already exist
ERROR (HY000): Timeout OB_GET_LOCATION_TIME_OUT
ERROR 4666 (HY000): cluster name does not match to \'%s\'
ERROR 4667 (HY000): Please check new zone in zone_merge_order. You can show parameters like 'zone_merge_order'
ERROR 4668 (HY000): The zone is not empty and can not be deleted. You should delete the servers of the zone. There are %ld servers alive and %ld not alive
ERROR 4671 (HY000): full replica num not enough
ERROR 4672 (HY000): replica num not enough
ERROR 4674 (HY000): run job not success yet
ERROR 4675 (HY000): no need to rebuild
ERROR 4676 (HY000): need remove unneed table
ERROR 4677 (HY000): no need to merge
ERROR 4681 (HY000): rpc need reconnect
ERROR 4683 (HY000): src do not allowed migrate
ERROR 4684 (HY000): Too many partitions were defined for this tenant
ERROR 4685 (HY000): active memtable not exist
ERROR 4686 (HY000): Should use leader replica for duplicate table after DML operator
ERROR 4688 (HY000): standby tenant is read only
ERROR 4690 (HY000): other primary cluster already exist, can not start as primary
ERROR 4691 (HY000): array binding needs to switch iterator
ERROR 4692 (HY000): standby cluster not empty
ERROR 4693 (HY000): not primary cluster
ERROR 4694 (HY000): check drop column failed
ERROR 4695 (HY000): not standby cluster
ERROR 4696 (HY000): cluster version not compatible
ERROR 4697 (HY000): wait trans table merge finish timeout
ERROR 4698 (HY000): skip renew location by rpc
ERROR 4699 (HY000): renew location by rpc failed
ERROR 4700 (HY000): cluster id does not match
ERROR 4701 (HY000): parameter cannot be modified because specified value is invalid
ERROR 4702 (HY000): %s %.*s already exists
ERROR 4703 (HY000): resource plan %.*s does not exist
ERROR 4704 (HY000): value %ld for %s is outside valid range of 0 to 100
ERROR 4705 (HY000): plan directive %.*s, %.*s does not exist
ERROR 4706 (HY000): plan directive %.*s, %.*s already exists
ERROR 4707 (HY000): plan directive name '%.*s' not supported
ERROR 4708 (HY000): Failover is not allowed
ERROR 4709 (HY000): Add cluster not allowed. Actions: %s
ERROR 4710 (HY000): consumer group %.*s does not exist
ERROR 4711 (HY000): cluster is not accessible, cluster_id: %ld
ERROR 4712 (HY000): rebuild global index:'%.*s' failed when drop/truncate partitions
ERROR 4713 (HY000): unique/primary keys in table referenced by enabled foreign keys
ERROR 4719 (HY000): log stream does not exist
ERROR 4720 (HY000): too many log streams were defined for this tenant
ERROR 4721 (HY000): log stream location does not exist
ERROR 4722 (HY000): log stream location leader does not exist
ERROR 4723 (HY000): mapping between tablet and log stream does not exist
ERROR 4724 (HY000): unexpected tablet existence
ERROR 4725 (HY000): tablet does not exist
ERROR 4727 (HY000): ls need revoke
ERROR 4732 (HY000): check cluster status", "%s
ERROR 4733 (HY000): zone '%s' resource not enough to hold %ld new unit. You can check resource info by views: DBA_OB_UNITS, GV$OB_UNITS, GV$OB_SERVERS.\n%s
ERROR 4734 (HY000): zone '%s' server not enough to hold %ld new unit, please check zone valid servers
ERROR 4735 (HY000): sstable not exist
ERROR 4736 (HY000): resource unit value is invalid
ERROR 4737 (HY000): log stream already exist
ERROR 4740 (HY000): log stream replica task result is uncertain
ERROR 4741 (HY000): log stream wait log replay timeout
ERROR 4742 (HY000): log stream wait tablet ready timeout
ERROR 4743 (HY000): freeze service epoch is not expected
ERROR 4744 (HY000): already exist larger frozen_scn in __all_freeze_info", "%s
ERROR 4745 (HY000): delete server not allowed
ERROR 4746 (HY000): Network error and packet status unknown. Abort auto retry
ERROR 4747 (HY000): arbitration service does not exist, %s
ERROR 4748 (HY000): arbitration service already exist, %s
ERROR 4751 (HY000): wait degration finished timeout
ERROR 4752(HY000): rootservice start process has failure
ERROR 4753(HY000): rootservice stop process has failure
ERROR 4754(HY000): root inspection is not passed
ERROR 4755(HY000): rootservice background thread may be hung
ERROR 4756(HY000): Migration src and dest version is not compatible
ERROR 4757 (HY000): Cluster info may remain on arbitration server '%.*s', please make sure whether to use ob_admin to clean it.
ERROR 4758 (HY000): the arbitration service may be unavailable, please check and retry
ERROR 4759 (HY000): An error was ignored when accessing virtual table, actual error code: %d
ERROR 4760 (HY000): log stream is offline
ERROR 4762(HY000): This operation has been finished without checking ls status
ERROR 4763(HY000): invalid user.table.column, table.column, or column specification
ERROR 4764(HY000): unknown SET option '%s'
ERROR 4765 (HY000): create standby tenant may fail, %s
ERROR 4766 (HY000): ls waiting safe destory, %s

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These error codes indicate RootService errors.

ERROR 4507 (42000): Convert error

  • OceanBase error code: 4507

  • Cause: An IP address is included in a string.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4512 (HY000): RootServer state error

  • OceanBase error code: 4512

  • Cause: The current status of the RootServer does not support the operation.

  • Solution: Check the current status of the RootServer. You can query the __all_virtual_core_meta_table table to check whether the RootServer is online.

ERROR 4515 (HY000): No replica is valid

  • OceanBase error code: 4515

  • Cause: The replica status is invalid.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4519 (HY000): Iteration was stopped

  • OceanBase error code: 4519

  • Cause: This error code does not indicate an error but indicates that the MemTable iteration ends.

  • Solution: Troubleshooting is not required.

ERROR 4530 (HY000): Zone info \'%s\' not exist

  • OceanBase error code: 4530

  • Cause: The specified zone does not exist. Generally, this error occurs during a major compaction of a specified zone or a switchover of the primary zone.

  • Solution: Check whether the specified zone exists. You can query the DBA_OB_ZONES table to obtain the required information.

ERROR 4544 (42000): Root not integrated

  • OceanBase error code: 4544

  • Cause: During a rotating major compaction, the system checks whether the available replicas in each partition constitute the majority of replicas in the current partition. This error occurs if the available replicas in a partition are fewer than the majority of replicas.

  • Solution: Immediately check why the majority of replicas in the partition are unavailable.

ERROR 4547 (HY000): global merge not started

  • OceanBase error code: 4547

  • Cause: This error occurs in the precheck before a manual rotating major compaction. A manual major compaction is not allowed for a cluster if no major freeze has been initiated for the cluster.

  • Solution: Check whether a major freeze has been initiated for the cluster.

ERROR 4548 (HY000): merge already started

  • OceanBase error code: 4548

  • Cause: This error occurs in the precheck before a manual rotating major compaction. If a manual major compaction has been initiated for a zone, you cannot initiate another manual major compaction for the cluster.

  • Solution: Check whether a manual major compaction has been initiated for the zone.

ERROR 4549 (HY000): rootservice already exist

  • OceanBase error code: 4549

  • Cause: This code is returned in the self-check before the current RootService replica starts. If another RootService replica is already running, the current RootService replica does not start.

  • Solution: Troubleshooting is not required.

ERROR 4550 (HY000): rootservice is shutdown

  • OceanBase error code: 4550

  • Cause: The RootService replica that receives the current request is inactive because no leader is elected or the request is sent to a follower.

  • Solution: Retry the request. If no leader is elected for RootService replicas, further troubleshooting is required.

ERROR 4551 (HY000): server migrate in denied

  • OceanBase error code: 4551

  • Cause: The OBServer node fails to execute the balance task due to reasons such as a full disk or an excessive number of partitions. As a result, the OBServer node returns a package indicating the balance task execution failure to the RootService and returns this error code.

  • Solution: The RootService automatically stops scheduling tasks to the OBServer node and then re-schedules tasks to the OBServer node after the specified period elapses. If the OBServer node continuously returns this error code, check whether the disk is overloaded and whether excessive partitions are in use.

ERROR 4552 (HY000): rebalance task can not executing now

  • OceanBase error code: 4552

  • Cause: Before executing a balance task, the RootService checks whether the leader is successfully switched, whether the replica already exists on the destination server, and whether the replica schema exists. If the check results indicate that the balance task cannot be executed, the task execution ends, and this error is returned.

  • Solution: Check the execution conditions of the balance task and identify the specific cause of the execution failure. For example, if the leader fails to be switched before migration, identify the cause of the leader switchover failure.

ERROR 4554 (HY000): rebalance task not in progress on observer

  • OceanBase error code: 4554

  • Cause: The RootService periodically sends RPC packets to the OBServer node to check whether each balance task exists. If a balance task no longer exists, the RootService marks the end of the balance task and returns this error code.

  • Solution: This error usually occurs if the response from meta_table is delayed or the response from the balance task to the RootService is lost. Usually, troubleshooting is not required.

ERROR 4605 (HY000): Data source timeout

  • OceanBase error code: 4605

  • Cause: The current RPC timed out during migration and replication at the storage layer.

  • Solution: Check the cause of the timeout error, or extend the timeout period.

ERROR 4615 (HY000): tablegroup is not empty

  • OceanBase error code: 4615

  • Cause: When you delete a table group, this error occurs in any one of the following scenarios:

    • The specified table group contains tables.

    • The table group specified by the default_tablegroup_id parameter of the database is deleted.

    • The table group specified by the default_tablegroup_id parameter of the tenant is deleted.

  • Solution: Delete all tables in the specified table group but retain the table group specified by the default_tablegroup_id parameter.

ERROR 4620 (HY000): server status is not valid

  • OceanBase error code: 4620

  • Cause: One or more OBServer node parameters are invalid.

  • Solution: Modify the OBServer node parameter settings.

ERROR 4621 (HY000): wait elect partition leader timeout

  • OceanBase error code: 4621

  • Cause: Leader election timed out.

  • Solution: Check the cause of the timeout, or extend the timeout period.

ERROR 4622 (HY000): wait all rs online timeout

  • OceanBase error code: 4622

  • Cause:

    1. The system checks whether the OBServer node that runs the RootService is in the ALIVE state during bootstrapping. This error occurs if the server is not in the ALIVE state.

    2. The system checks whether the OBServer node that runs the RootService is in the in_service state or whether the value of start_service_time is 0 during bootstrapping. This error occurs if the server is not in the in_service state or the value of start_service_time is not 0.

  • Solution: Check the cause of the timeout, or extend the timeout period.

ERROR 4624 (HY000): zone '%s' server '%s' %s resource is not enough to hold a new unit

  • OceanBase error code: 4624

  • Cause:

    1. The system checks whether resources are sufficient during resource allocation in scenarios such as creating or modifying a resource pool, migrating resource units, or supplementing replicas. This error occurs if resources are insufficient.

    2. The system checks whether resources are sufficient when you create a table. This error occurs if resources are insufficient.

  • Solution: Adjust the amount of resources to be allocated based on the specific cause.

ERROR 4626 (HY000): resource pool \'%s\' has already been granted to a tenant

  • OceanBase error code: 4626

  • Cause: The resource pool is being used by a tenant.

  • Solution: Query the __all_resource_pool table to obtain the tenant_id value of the tenant that is using the resource pool. Then, perform one of the following operations:

    • Delete the tenant.

    • Remove the resource pool from the tenant.

    • Create another resource pool without using the current resource pool.

ERROR 4628 (HY000): server has already been deleted

  • OceanBase error code: 4628

  • Cause: The specified OBServer node is already in the Deleting state, and you cannot run the delete server command on the OBServer node again.

  • Solution: This error is reported for defense purposes, indicating that you cannot run the delete server command again.

ERROR 4629 (HY000): server is not in deleting status

  • OceanBase error code: 4629

  • Cause: This error is reported for defense purposes, indicating that the delete server task has ended.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4630 (HY000): server not in server white list

  • OceanBase error code: 4630

  • Cause: The OBServer node is not in the current cluster. This error is an internal error and may occur in one of the following scenarios:

    • The RootService is switched to the server but has not provided services.

    • The cluster is in the bootstrapping process.

    • The add server command is not run for the server.

    • The server sends a request to the current cluster.

  • Solution:

    • If the RootService is switched to the server but has not provided services or the cluster is in the bootstrapping process, and this error occurs only temporarily, troubleshooting is not required.

    • If the add server command is not run for the server, run the add server command.

    • If the cluster also exists in another database, contact OceanBase Technical Support for troubleshooting.

ERROR 4631 (HY000): server zone not match

  • OceanBase error code: 4631

  • Cause: This error is reported for defense purposes, indicating that the OBServer node and zone specified for the start server, delete server, or stop server command do not match.

  • Solution: If a zone is specified, check whether the OBServer node and zone in the __all_server table match.

ERROR 4632 (HY000): zone num has reach max zone num

  • OceanBase error code: 4632

  • Cause: This error is reported for defense purposes when you run the add zone command, indicating that the number of existing zones exceeds 64.

  • Solution: Run the delete zone command to remove zones that are not in use.

ERROR 4633 (HY000): zone status not match

  • OceanBase error code: 4633

  • Cause: This error is reported for defense purposes when you run the delete/start zone command. When you run the delete zone command, the specified zone must be in the inactive state. When you run the start zone command, the specified zone must be in a state other than active.

  • Solution: Query the DBA_OB_ZONES table to check the status of the zone. If the zone is in an unexpected state, contact OceanBase Technical Support for troubleshooting.

ERROR 4634 (HY000): resource unit \'%s\' is referenced by some resource pool

  • OceanBase error code: 4634

  • Cause: The resource unit to be deleted or used is being referenced by a resource pool.

  • Solution:

    1. Query the __all_unit_config or __all_resource_pool table to find the resource pool that is referencing the resource unit.

    2. Execute the ALTER RESOURCE POOL statement to remove the resource unit from the resource pool, or execute the DROP RESOURCE POOL statement to directly delete the resource pool.

    3. Execute the DROP RESOURCE UNIT or ALTER RESOURCE POOL statement to delete or directly use the resource unit.

ERROR 4636 (HY000): table schema primary zone different with other table in same tablegroup

  • OceanBase error code: 4636

  • Cause: This error is reported for defense purposes. It indicates that the primary_zone setting of the table to be added to a table group does not match that of other tables in the table group.

  • Solution: Make sure that the primary_zone settings of all tables in a table group are identical.

ERROR 4637 (HY000): server is not active

  • OceanBase error code: 4637

  • Cause: This error is an internal error, indicating that the specified OBServer node is in the inactive state.

  • Solution: Generally, troubleshooting is not required. For more information, contact OceanBase Technical Support.

ERROR 4638 (HY000): The RootServer is not the master

  • OceanBase error code: 4638

  • Cause: The RootService is switched to another server, or the RootService is being restarted.

  • Solution: Generally, you can retry later. If the error persists, contact OceanBase Technical Support for troubleshooting.

ERROR 4640 (HY000): The chosen partition servers belong to same zone

  • OceanBase error code: 4640

  • Cause: OBServer nodes in the rs_list parameter specified in the bootstrap command correspond to the same zone.

  • Solution: In a partition, one zone can contain only one Paxos member. Modify the zone settings of OBServer nodes in the rs_list parameter specified in the bootstrap command.

ERROR 4641 (HY000): Duplicated zone \'%s\' in zone list %s

  • OceanBase error code: 4641

  • Cause: Specific zones in the zone_list parameter are duplicated.

  • Solution: Remove redundant zones from the zone_list parameter.

ERROR 4646 (HY000): tenant name \'%s\' over max_tenant_name_length %ld

  • OceanBase error code: 4646

  • Cause: The tenant_name parameter is invalid. For example, no value is specified for the parameter, or the value contains more than 64 characters.

  • Solution: Modify the tenant_name parameter.

ERROR 4647 (HY000): resource pool list is empty

  • OceanBase error code: 4647

  • Cause: No resource pool is specified when you create a tenant.

  • Solution: Specify a resource pool when you create a tenant.

ERROR 4648 (HY000): resource unit \'%s\' not exist

  • OceanBase error code: 4648

  • Cause: The specified resource unit specification does not exist.

  • Solution: Check whether the specified resource pool exists.

ERROR 4649 (HY000): resource unit \'%s\' already exist

  • OceanBase error code: 4649

  • Cause: A resource unit specification with the specified name already exists.

  • Solution: Specify another name for the resource unit specification to be created.

ERROR 4650 (HY000): resource pool \'%s\' not exist

  • OceanBase error code: 4650

  • Cause: The specified resource pool does not exist.

  • Solution: Check whether the specified resource pool exists.

ERROR 4651 (HY000): resource pool \'%s\' exist

  • OceanBase error code: 4651

  • Cause: A resource pool with the specified name already exists.

  • Solution: Specify another name for the resource pool to be created.

ERROR 4652 (HY000): wait leader switch timeout

  • OceanBase error code: 4652

  • Cause: The system failed to stop the zone or OBServer node because the leader switchover timed out.

  • Solution: Extend the timeout period, or contact OceanBase Technical Support for troubleshooting.

ERROR 4653 (HY000): location not exist

  • OceanBase error code: 4653

  • Cause: Location information is not found during SQL execution.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4654 (HY000): location leader not exist

  • OceanBase error code: 4654

  • Cause: No leader is found in location information during SQL execution.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4655 (HY000): zone not active

  • OceanBase error code: 4655

  • Cause: The specified zone is inactive.

  • Solution: Wait until the zone is active and try again.

ERROR 4656 (HY000): resource pool unit num is bigger than zone server count

  • OceanBase error code: 4656

  • Cause: The number of resource units in a zone is greater than the number of OBServer nodes in the zone.

  • Solution: Make sure that the number of resource units in the zone is less than the number of OBServer nodes in the zone.

The troubleshooting knowledge base entry:

ERROR 4657 (HY000): resource pool list %s unit servers intersect

  • OceanBase error code: 4657

  • Cause: Zones in the resource pools of a tenant have one or more intersections.

  • Solution: Make sure that zones in all resource pools of the tenant have no intersection.

ERROR 4659 (HY000): invalid %s value, min value is %s

  • OceanBase error code: 4659

  • Cause: The specified resource unit specification is invalid.

  • Solution: Set the resource unit specification to be within the range of min_val to max_val.

ERROR 4660 (HY000): Can not stop server in multiple zones, there are already servers stopped in zone:%s

  • OceanBase error code: 4660

  • Cause: You have attempted to stop OBServer nodes in multiple zones at a time.

  • Solution: Make sure that you stop OBServer nodes only in one zone at a time.

ERROR 4661 (HY000): Session already exist

  • OceanBase error code: 4661

  • Cause: The session to be created conflicts with an existing session.

  • Solution: This error rarely occurs. If this error occurs, contact OceanBase Technical Support for troubleshooting.

ERROR (HY000): Timeout OB_GET_LOCATION_TIME_OUT

  • OceanBase error code: 4664

  • Cause: A timeout error occurred when the system queried the location cache during SQL execution.

  • Solution: Extend the timeout period, or contact OceanBase Technical Support for troubleshooting.

ERROR 4666 (HY000): cluster name does not match to \'%s\'

  • OceanBase error code: 4666

  • Cause: The cluster name specified in the command is invalid.

  • Solution: Execute the show parameters where name ='cluster' statement to obtain the valid cluster name.

ERROR 4667 (HY000): Please check new zone in zone_merge_order. You can show parameters like 'zone_merge_order'

  • OceanBase error code: 4667

  • Cause: The zone_merge_order parameter was specified when you ran the add zone command. However, the zone_merge_order parameter was not modified when you performed the current operation.

  • Solution: Execute the show parameters like 'zone_merge_order' statement to query the zone_merge_order parameter and modify it.

ERROR 4668 (HY000): The zone is not empty and can not be deleted. You should delete the servers of the zone. There are %ld servers alive and %ld not alive

  • OceanBase error code: 4668

  • Cause: The zone to be deleted contains servers.

  • Solution: Delete all OBServer nodes from the zone and then delete the zone.

ERROR 4671 (HY000): full replica num not enough

  • OceanBase error code: 4671

  • Cause: No FULL replica (full-featured replica) was created when you created a partition.

  • Solution: Contact OceanBase Technical Support for troubleshooting.

ERROR 4672 (HY000): replica num not enough

  • OceanBase error code: 4672

  • Cause: The available replicas in a partition are fewer than the majority of replicas.

  • Solution: Check the number of available replicas in the corresponding partition.

ERROR 4674 (HY000): run job not success yet

  • OceanBase error code: 4674

  • Cause: In OceanBase File System (OFS) deployment mode, a block recycling task is scheduled before the previous task is accepted.

  • Solution: Generally, troubleshooting is not required. For more information, contact OceanBase Technical Support.

ERROR 4675 (HY000): no need to rebuild

  • OceanBase error code: 4675

  • Cause: The logs of the replica to be rebuilt are updated to the latest version.

  • Solution: Do not perform a rebuild operation on the replica.

ERROR 4676 (HY000): need remove unneed table

  • OceanBase error code: 4676

  • Cause: A MemTable is not released after a minor compaction and is involved in a subsequent minor compaction.

  • Solution: Generally, troubleshooting is not required. For more information, contact OceanBase Technical Support.

ERROR 4677 (HY000): no need to merge

  • OceanBase error code: 4677

  • Cause: No MemTable or SSTable matching the minor compaction condition is found for the current minor compaction scheduling.

  • Solution: Generally, troubleshooting is not required. For more information, contact OceanBase Technical Support.

ERROR 4681 (HY000): rpc need reconnect

  • OceanBase error code: 4681

  • Cause: The logical migration feature is no longer in use.

ERROR 4683 (HY000): src do not allowed migrate

  • OceanBase error code: 4683

  • Cause: Data cannot be migrated from the source database when the source database is being deleted.

  • Solution: Try again.

ERROR 4684 (HY000): Too many partitions were defined for this tenant

  • OceanBase error code: 4684

  • Cause: The number of partitions of the tenant has reached the upper limit, and you cannot create more partitions for the tenant.

  • Solution: Check whether the recycle bin contains partitions.

    1. If yes, run the purge recyclebin command under the tenant. After a garbage collection (GC) is completed for partitions, some memory space can be released.

    2. If no, you must allocate more memory space to the tenant to create more partitions.

ERROR 4685 (HY000): active memtable not exist

  • OceanBase error code: 4685

  • Cause: No active MemTable exists.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4686 (HY000): Should use leader replica for duplicate table after DML operator

  • OceanBase error code: 4686

  • Cause: Data has been written to partitions of the replicated table. Subsequent read requests must be routed to leaders in the partitions of the replicated table.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4688 (HY000): standby tenant is read only

  • OceanBase error code: 4688

  • Cause: A standby cluster supports only reads.

  • Solution: Switch the standby cluster to be the primary cluster.

ERROR 4690 (HY000): other primary cluster already exist, can not start as primary

  • OceanBase error code: 4690

  • Cause: Another cluster serves as the primary cluster, and the current cluster cannot be elected as the primary cluster.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4691 (HY000): array binding needs to switch iterator

  • OceanBase error code: 4691

  • Cause: The iterator has stopped.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4692 (HY000): standby cluster not empty

  • OceanBase error code: 4692

  • Cause: The current standby cluster is not empty and cannot be added.

  • Solution: Clear the standby cluster, bootstrap it again, and then add it.

ERROR 4693 (HY000): not primary cluster

  • OceanBase error code: 4693

  • Cause: The current cluster is not the primary cluster.

  • Solution: Confirm the role of the current cluster.

ERROR 4694 (HY000): check drop column failed

  • OceanBase error code: 4694

  • Cause: The drop column operation failed because partitions were under a major compaction.

  • Solution: Wait until the major compaction of all partitions is completed. If the error persists, contact OceanBase Technical Support for troubleshooting.

ERROR 4695 (HY000): not standby cluster

  • OceanBase error code: 4695

  • Cause: The specified cluster is not a standby cluster and cannot be added.

  • Solution: Check the role of the cluster. You can add only standby clusters to the primary cluster.

ERROR 4696 (HY000): cluster version not compatible

  • OceanBase error code: 4696

  • Cause: The standby cluster is of a version different from that of the primary cluster and cannot be added.

  • Solution: In the primary/standby cluster deployment mode, make sure that the versions of the primary and standby clusters are the same.

ERROR 4697 (HY000): wait trans table merge finish timeout

  • OceanBase error code: 4697

  • Cause: A minor compaction of the transaction status table timed out.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4698 (HY000): skip renew location by rpc

  • OceanBase error code: 4698

  • Cause: The location cache failed to be refreshed by using internal RPCs.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4699 (HY000): renew location by rpc failed

  • OceanBase error code: 4699

  • Cause: The location cache failed to be refreshed by using internal RPCs.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

ERROR 4700 (HY000): cluster id does not match

  • OceanBase error code: 4700

  • Cause: The value of the cluster id parameter is inconsistent with the ID of the current cluster.

  • Solution: Query the ID of the current cluster and modify the cluster id parameter.

ERROR 4701 (HY000): parameter cannot be modified because specified value is invalid

  • OceanBase error code: 4701

  • Cause: The specified parameter value is invalid.

  • Solution: Modify the specified parameter value and run the command again.

ERROR 4702 (HY000): %s %.*s already exists

  • OceanBase error code: 4702

  • Cause: A resource object with the specified name already exists.

  • Solution: Specify another name for the resource object to be created.

ERROR 4703 (HY000): resource plan %.*s does not exist

  • OceanBase error code: 4703

  • Cause: The specified resource plan does not exist.

  • Solution: Specify a valid resource plan name and run the command again.

ERROR 4704 (HY000): value %ld for %s is outside valid range of 0 to 100

  • OceanBase error code: 4704

  • Cause: The specified resource usage is invalid. The value must be within the range of [0,100].

  • Solution: Specify a valid value.

ERROR 4705 (HY000): plan directive %.*s, %.*s does not exist

  • OceanBase error code: 4705

  • Cause: The specified plan directive does not exist.

  • Solution: Specify a valid plan directive name.

ERROR 4706 (HY000): plan directive %.*s, %.*s already exists

  • OceanBase error code: 4706

  • Cause: A plan directive with the specified name already exists.

  • Solution: Specify another name for the plan directive to be created.

ERROR 4707 (HY000): plan directive name '%.*s' not supported

  • OceanBase error code: 4707

  • Cause: The plan directive specified for creating a user resource group mapping does not exist.

  • Solution: Specify a valid plan directive name.

ERROR 4708 (HY000): Failover is not allowed

  • OceanBase error code: 4708

  • Cause: Failovers are not allowed.

  • Solution: Identify the cause of the failover failure based on the error message.

ERROR 4709 (HY000): Add cluster not allowed. Actions: %s

  • OceanBase error code: 4709

  • Cause: The standby cluster cannot be added. The information that follows Actions describes the cause and solution.

  • Solution: Resolve the problem based on the information that follows Actions and perform a failover.

ERROR 4710 (HY000): consumer group %.*s does not exist

  • OceanBase error code: 4710

  • Cause: The specified user resource group does not exist.

  • Solution: Specify a valid user resource group name.

ERROR 4711 (HY000): cluster is not accessible, cluster_id: %ld

  • OceanBase error code: 4711

  • Cause: The specified cluster is inaccessible.

  • Solution: Check whether the value of cluster_id is correct. If the value of cluster_id is correct, check whether the cluster is accessible and whether the RootService is normal.

ERROR 4712 (HY000): rebuild global index:'%.*s' failed when drop/truncate partitions

  • OceanBase error code: 4712

  • Cause: The partition is dropped or truncated, but the corresponding index rebuild task fails.

  • Solution:

    1. Identify the related invalid indexes.

    2. Delete the invalid indexes.

    3. Rebuild indexes.

ERROR 4713 (HY000): unique/primary keys in table referenced by enabled foreign keys

  • OceanBase error code: 4713

  • Cause: The operation conflicts with a foreign key.

  • Solution: Disassociate from the foreign key and perform the operation again.

ERROR 4719 (HY000): log stream does not exist

  • OceanBase error code: 4719

  • Cause: No corresponding log stream exists on the current OBServer node.

  • Solution: This is an internal error code. Contact OceanBase Technical Support for troubleshooting.

Note

Since OceanBase Database V4.0.0, the error message is changed from ERROR 4719 (HY000): partition has been dropped to ERROR 4719 (HY000): log stream does not exist.

ERROR 4720 (HY000): too many log streams were defined for this tenant

  • OceanBase error code: 4720

  • Cause: A tenant on a single OBServer node supports a maximum of 100 log streams. If the limit is exceeded, this error is reported.

  • Solution: Reduce the number of log streams of a tenant on a single OBServer node.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4721 (HY000): log stream location does not exist

  • OceanBase error code: 4721

  • Cause: The location information of the corresponding log stream was not found in the internal tables.

  • Solution: The system will automatically retry. If this error still occurs after a retry, you must check whether the corresponding log stream exists and is reported.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4722 (HY000): log stream location leader does not exist

  • OceanBase error code: 4722

  • Cause: The leader information was not found in the location information. This may be caused by the absence of the leader in the log stream.

  • Solution: Check whether the leader of the corresponding log stream is available.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4723 (HY000): mapping between tablet and log stream does not exist

  • OceanBase error code: 4723

  • Cause: The corresponding log stream information of the tablet was not found in the internal tables.

  • Solution: The system will automatically retry. If this error still occurs after a retry, you must check whether the corresponding tablet exists and is reported.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4724 (HY000): unexpected tablet existence

  • OceanBase error code: 4724

  • Cause: An internal error occurred. An unexpected tablet exists. You are creating a duplicate tablet.

  • Solution: Contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4725 (HY000): tablet does not exist

  • OceanBase error code: 4725

  • Cause: An internal error occurred. The tablet does not exist.

  • Solution: Contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4727 (HY000): ls need revoke

  • OceanBase error code: 4727

  • Cause: During an automatic switchover, the submodule that is registered to detect the switchover fails and cannot be rolled back to the original state.

  • Solution: The kernel automatically executes the forced revocation logic.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4732 (HY000): check cluster status", "%s

  • OceanBase error code: 4732

  • Cause: The cluster status is incorrect.

  • Solution: Query the __all_cluster_info table to check the cluster_role and switchover_status fields of the cluster for exceptions.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4733 (HY000): zone '%s' resource not enough to hold %ld new unit. You can check resource info by views: DBA_OB_UNITS, GV$OB_UNITS, GV$OB_SERVERS.\n%s

  • OceanBase error code: 4733

  • Cause: The remaining resources of the zone are insufficient to create all units. This error code may be returned when you perform the following operations:

    • Create a resource pool.
    • Modify the number of units in the resource pool.
    • Modify the unit specifications.
  • Solution: View the allocated resources and modify the resource allocation as needed.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4734 (HY000): zone '%s' server not enough to hold %ld new unit, please check zone valid servers

  • OceanBase error code: 4734

  • Cause: The zone does not have enough effective OBServer nodes for creating all units. This error code may be returned when you perform the following operations:

    • Create a resource pool.
    • Modify the number of units in the resource pool.
    • Modify the unit specifications.
  • Solution: Check the number of effective OBServer nodes and adjust the required resources.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4735 (HY000): sstable not exist

  • OceanBase error code: 4735

  • Cause: The source SSTables to be merged cannot be found during the migration.

  • Solution: Generally, you can retry later. If the error persists, contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4736 (HY000): resource unit value is invalid

  • OceanBase error code: 4736

  • Cause: The values of the unit specification are invalid.

  • Solution: Change the values of the unit specification to valid ones.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4737 (HY000): log stream already exist

  • OceanBase error code: 4737

  • Cause: The log stream that is being migrated already exists at the destination.

  • Solution: Generally, troubleshooting is not required. The system will wait for the garbage collection (GC) operation on the local log stream at the destination and retries. If this error persists, contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4740 (HY000): log stream replica task result is uncertain

  • OceanBase error code: 4740

  • Cause: The disaster recovery task detection mechanism found an invalid log stream replica task, and the task execution result is uncertain.

  • Solution: Troubleshooting is not required.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4741 (HY000): log stream wait log replay timeout

  • OceanBase error code: 4741

  • Cause: During the migration of the log stream to the destination, the wait for clog replay timed out.

  • Solution: Generally, troubleshooting is not required. The system will retry the migration. If this error persists, contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4742 (HY000): log stream wait tablet ready timeout

  • OceanBase error code: 4742

  • Cause: During the migration of the log stream, the wait for all tablets at the destination to become normal timed out.

  • Solution: Generally, troubleshooting is not required. The system will retry the migration. If this error persists, contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4743 (HY000): freeze service epoch is not expected

  • OceanBase error code: 4743

  • Cause: The epoch inconsistency of the major compaction service occurred due to the log stream switchover.

  • Solution: This is an internal error code of the major compaction feature. Contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4744 (HY000): already exist larger frozen_scn in __all_freeze_info", "%s

  • OceanBase error code: 4744

  • Cause: A major freeze was initiated before the ongoing major compaction was completed.

  • Solution: Initiate a major freeze only after the previous major compaction is completed.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4745 (HY000): delete server not allowed

  • OceanBase error code: 4745

  • Cause: No other servers in the same zone could host the data on the deleted server. Two possible scenarios:

    1. No idle servers are available in the same zone.
    2. The resources on the idle server are insufficient to host the unit of the deleted server.
  • Solution: Add an idle server with sufficient resources or scale up the idle server in the same zone.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4746 (HY000): Network error and packet status unknown. Abort auto retry

  • OceanBase error code: 4746
  • Cause: During the execution of a distributed plan, the scheduling failed due to an unstable network connection or node failure.
  • Solution: Re-execute the SQL statement.

Note

This error code is introduced since OceanBase Database V4.0.0.

ERROR 4747 (HY000): arbitration service does not exist, %s

  • OceanBase error code: 4747

  • Cause: The arbitration service endpoint is not configured for the cluster.

  • Solution: OceanBase clusters do not support arbitration if the arbitration service endpoint is not configured. Set the arbitration service endpoint for the cluster by using OCP or the SQL command alter system add arbitration service'$svr_ip:$svr_port';.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4748 (HY000): arbitration service already exist, %s

  • OceanBase error code: 4748

  • Cause: The cluster already has a valid arbitration service endpoint.

  • Solution: Configure only one arbitration service endpoint for the cluster.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4751 (HY000): wait degration finished timeout

  • OceanBase error code: 4751

  • Cause: Waiting for tenant degradation timed out during a Stop Server operation.

  • Solution: Execute the Stop Server command again until it succeeds.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4752(HY000): rootservice start process has failure

  • OceanBase error code: 4752
  • Cause: The RootService startup process failed.
  • Solution: Contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4753(HY000): rootservice stop process has failure

  • OceanBase error code: 4753
  • Cause: The RootService stopping process failed.
  • Solution: Contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4754(HY000): root inspection is not passed

  • OceanBase error code: 4754
  • Cause: The RootService failed the inspection.
  • Solution: Contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4755(HY000): rootservice background thread may be hung

  • OceanBase error code: 4755
  • Cause: The RootService background thread may be suspended.
  • Solution: Contact OceanBase Technical Support for troubleshooting.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4756(HY000): Migration src and dest version is not compatible

  • OceanBase error code: 4756
  • Cause: The source and destination versions are not compatible with each other.
  • Solution: Troubleshooting is not required. The migration and replication kernel will retry the migration.

Note

This error code is introduced since OceanBase Database V4.1.0.

ERROR 4757 (HY000): Cluster info may remain on arbitration server '%.*s', please make sure whether to use ob_admin to clean it.

  • OceanBase error code: 4757
  • Cause: When you replace or delete the cluster arbitration service, the cluster information is detected on the arbitration server.
  • Solution: Use the ob_admin tool to clear the cluster information. Confirm whether you need to clear the cluster information before you use the ob_admin tool.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4758 (HY000): the arbitration service may be unavailable, please check and retry

  • OceanBase error code: 4758
  • Cause: The arbitration service may be unavailable.
  • Solution: Check the arbitration service status or the network connection and retry.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4759 (HY000): An error was ignored when accessing virtual table, actual error code: %d

  • OceanBase error code: 4759
  • Cause: An error occurred and the error code, for example, 1305, was returned during the access to the virtual table, but the error was ignored.
  • Solution: Check the error log of the error code 1305 to find the information about the virtual table access error, and fix the error based on the information.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4760 (HY000): log stream is offline

  • OceanBase error code: 4760
  • Cause: The log stream of the local server was being stopped and could not be read.
  • Solution: Re-execute the SQL statement.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4762(HY000): This operation has been finished without checking ls status

  • OceanBase error code: 4762
  • Cause: The tenant-level parameter enable_rebalance is disabled. As a result, log streams are not balanced. Some operations require checking whether the log streams are balanced. If the check is skipped, the operations directly end.
  • Solution: Troubleshooting is not required.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4763(HY000): invalid user.table.column, table.column, or column specification

  • OceanBase error code: 4763
  • Cause: The username, table name, or column name specified in the SQL statement is incorrect or invalid.
  • Solution: Make sure that the user name, table name, and column name specified in the SQL statement are free of spelling or syntax errors.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4764(HY000): unknown SET option '%s'

  • OceanBase error code: 4764
  • Cause: An unknown option is specified in the SET command.
  • Solution: Make sure that the options specified in the SET command are free of spelling or syntax errors.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4765 (HY000): create standby tenant may fail, %s

  • OceanBase error code: 4765
  • Cause: An unknown exception occurred.
  • Solution: Query the V$OB_LS_LOG_RESTORE_STATUS table to check the recovery status of the system log stream.

Note

This error code is introduced since OceanBase Database V4.2.0.

ERROR 4766 (HY000): ls waiting safe destory, %s

  • OceanBase error code: 4766
  • Cause: The message indicates that the log stream is waiting to be safely destroyed.
  • Solution: Troubleshooting is not required.

Note

This error code is introduced since OceanBase Database V4.2.0.

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ERROR 4507 (42000): Convert error
ERROR 4512 (HY000): RootServer state error
ERROR 4515 (HY000): No replica is valid
ERROR 4519 (HY000): Iteration was stopped
ERROR 4530 (HY000): Zone info \'%s\' not exist
ERROR 4544 (42000): Root not integrated
ERROR 4547 (HY000): global merge not started
ERROR 4548 (HY000): merge already started
ERROR 4549 (HY000): rootservice already exist
ERROR 4550 (HY000): rootservice is shutdown
ERROR 4551 (HY000): server migrate in denied
ERROR 4552 (HY000): rebalance task can not executing now
ERROR 4554 (HY000): rebalance task not in progress on observer
ERROR 4605 (HY000): Data source timeout
ERROR 4615 (HY000): tablegroup is not empty
ERROR 4620 (HY000): server status is not valid
ERROR 4621 (HY000): wait elect partition leader timeout
ERROR 4622 (HY000): wait all rs online timeout
ERROR 4624 (HY000): zone '%s' server '%s' %s resource is not enough to hold a new unit
ERROR 4626 (HY000): resource pool \'%s\' has already been granted to a tenant
ERROR 4628 (HY000): server has already been deleted
ERROR 4629 (HY000): server is not in deleting status
ERROR 4630 (HY000): server not in server white list
ERROR 4631 (HY000): server zone not match
ERROR 4632 (HY000): zone num has reach max zone num
ERROR 4633 (HY000): zone status not match
ERROR 4634 (HY000): resource unit \'%s\' is referenced by some resource pool
ERROR 4636 (HY000): table schema primary zone different with other table in same tablegroup
ERROR 4637 (HY000): server is not active
ERROR 4638 (HY000): The RootServer is not the master
ERROR 4640 (HY000): The chosen partition servers belong to same zone
ERROR 4641 (HY000): Duplicated zone \'%s\' in zone list %s
ERROR 4646 (HY000): tenant name \'%s\' over max_tenant_name_length %ld
ERROR 4647 (HY000): resource pool list is empty
ERROR 4648 (HY000): resource unit \'%s\' not exist
ERROR 4649 (HY000): resource unit \'%s\' already exist
ERROR 4650 (HY000): resource pool \'%s\' not exist
ERROR 4651 (HY000): resource pool \'%s\' exist
ERROR 4652 (HY000): wait leader switch timeout
ERROR 4653 (HY000): location not exist
ERROR 4654 (HY000): location leader not exist
ERROR 4655 (HY000): zone not active
ERROR 4656 (HY000): resource pool unit num is bigger than zone server count
ERROR 4657 (HY000): resource pool list %s unit servers intersect
ERROR 4659 (HY000): invalid %s value, min value is %s
ERROR 4660 (HY000): Can not stop server in multiple zones, there are already servers stopped in zone:%s
ERROR 4661 (HY000): Session already exist
ERROR (HY000): Timeout OB_GET_LOCATION_TIME_OUT
ERROR 4666 (HY000): cluster name does not match to \'%s\'
ERROR 4667 (HY000): Please check new zone in zone_merge_order. You can show parameters like 'zone_merge_order'
ERROR 4668 (HY000): The zone is not empty and can not be deleted. You should delete the servers of the zone. There are %ld servers alive and %ld not alive
ERROR 4671 (HY000): full replica num not enough
ERROR 4672 (HY000): replica num not enough
ERROR 4674 (HY000): run job not success yet
ERROR 4675 (HY000): no need to rebuild
ERROR 4676 (HY000): need remove unneed table
ERROR 4677 (HY000): no need to merge
ERROR 4681 (HY000): rpc need reconnect
ERROR 4683 (HY000): src do not allowed migrate
ERROR 4684 (HY000): Too many partitions were defined for this tenant
ERROR 4685 (HY000): active memtable not exist
ERROR 4686 (HY000): Should use leader replica for duplicate table after DML operator
ERROR 4688 (HY000): standby tenant is read only
ERROR 4690 (HY000): other primary cluster already exist, can not start as primary
ERROR 4691 (HY000): array binding needs to switch iterator
ERROR 4692 (HY000): standby cluster not empty
ERROR 4693 (HY000): not primary cluster
ERROR 4694 (HY000): check drop column failed
ERROR 4695 (HY000): not standby cluster
ERROR 4696 (HY000): cluster version not compatible
ERROR 4697 (HY000): wait trans table merge finish timeout
ERROR 4698 (HY000): skip renew location by rpc
ERROR 4699 (HY000): renew location by rpc failed
ERROR 4700 (HY000): cluster id does not match
ERROR 4701 (HY000): parameter cannot be modified because specified value is invalid
ERROR 4702 (HY000): %s %.*s already exists
ERROR 4703 (HY000): resource plan %.*s does not exist
ERROR 4704 (HY000): value %ld for %s is outside valid range of 0 to 100
ERROR 4705 (HY000): plan directive %.*s, %.*s does not exist
ERROR 4706 (HY000): plan directive %.*s, %.*s already exists
ERROR 4707 (HY000): plan directive name '%.*s' not supported
ERROR 4708 (HY000): Failover is not allowed
ERROR 4709 (HY000): Add cluster not allowed. Actions: %s
ERROR 4710 (HY000): consumer group %.*s does not exist
ERROR 4711 (HY000): cluster is not accessible, cluster_id: %ld
ERROR 4712 (HY000): rebuild global index:'%.*s' failed when drop/truncate partitions
ERROR 4713 (HY000): unique/primary keys in table referenced by enabled foreign keys
ERROR 4719 (HY000): log stream does not exist
ERROR 4720 (HY000): too many log streams were defined for this tenant
ERROR 4721 (HY000): log stream location does not exist
ERROR 4722 (HY000): log stream location leader does not exist
ERROR 4723 (HY000): mapping between tablet and log stream does not exist
ERROR 4724 (HY000): unexpected tablet existence
ERROR 4725 (HY000): tablet does not exist
ERROR 4727 (HY000): ls need revoke
ERROR 4732 (HY000): check cluster status", "%s
ERROR 4733 (HY000): zone '%s' resource not enough to hold %ld new unit. You can check resource info by views: DBA_OB_UNITS, GV$OB_UNITS, GV$OB_SERVERS.\n%s
ERROR 4734 (HY000): zone '%s' server not enough to hold %ld new unit, please check zone valid servers
ERROR 4735 (HY000): sstable not exist
ERROR 4736 (HY000): resource unit value is invalid
ERROR 4737 (HY000): log stream already exist
ERROR 4740 (HY000): log stream replica task result is uncertain
ERROR 4741 (HY000): log stream wait log replay timeout
ERROR 4742 (HY000): log stream wait tablet ready timeout
ERROR 4743 (HY000): freeze service epoch is not expected
ERROR 4744 (HY000): already exist larger frozen_scn in __all_freeze_info", "%s
ERROR 4745 (HY000): delete server not allowed
ERROR 4746 (HY000): Network error and packet status unknown. Abort auto retry
ERROR 4747 (HY000): arbitration service does not exist, %s
ERROR 4748 (HY000): arbitration service already exist, %s
ERROR 4751 (HY000): wait degration finished timeout
ERROR 4752(HY000): rootservice start process has failure
ERROR 4753(HY000): rootservice stop process has failure
ERROR 4754(HY000): root inspection is not passed
ERROR 4755(HY000): rootservice background thread may be hung
ERROR 4756(HY000): Migration src and dest version is not compatible
ERROR 4757 (HY000): Cluster info may remain on arbitration server '%.*s', please make sure whether to use ob_admin to clean it.
ERROR 4758 (HY000): the arbitration service may be unavailable, please check and retry
ERROR 4759 (HY000): An error was ignored when accessing virtual table, actual error code: %d
ERROR 4760 (HY000): log stream is offline
ERROR 4762(HY000): This operation has been finished without checking ls status
ERROR 4763(HY000): invalid user.table.column, table.column, or column specification
ERROR 4764(HY000): unknown SET option '%s'
ERROR 4765 (HY000): create standby tenant may fail, %s
ERROR 4766 (HY000): ls waiting safe destory, %s