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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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OceanBase Database

SQL - V4.2.1

  • 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
    • Quick start with OceanBase Database Community Edition
    • 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 (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
        • Use database connection pool
          • Database connection pool configuration
          • Tomcat
          • c3p0
          • Proxool
          • HikariCP
          • DBCP
          • Commons Pool
          • Druid
      • Sample applications
        • Java
          • Spring Boot
          • Spring Batch
          • Spring Data JDBC
          • Spring Data JPA
          • Hibernate
          • MyBatis
        • Python
          • mysqlclient
          • PyMySQL
        • Go
          • Go-SQL-Driver/MySQL
          • GORM
      • 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 (Oracle mode)
      • Connect to OceanBase Database
        • Overview
        • Connect to an OceanBase Database tenant by using OBClient
        • Connect to OceanBase Database by using ODC
        • Use database connection pool
          • Database connection pool configuration
          • Tomcat
          • c3p0
          • Proxool
          • HikariCP
          • DBCP
          • Commons Pool
          • Druid
      • Sample applications
        • Java
          • OceanBase Connector/J
          • Spring Boot
          • Spring Batch
          • Spring Data JDBC
          • Spring Data JPA
          • Hibernate
          • MyBatis
          • JFinal
        • C/C++
          • OceanBase Connector/C
          • OceanBase Connector/ODBC
          • SqlSugar
      • 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
    • HA deployment solutions for OceanBase clusters
    • Deploy OceanBase Database Enterprise Edition
      • Deployment process
      • Before deployment
        • Prepare servers
        • Configure servers
        • 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 standalone OceanBase database by using OCP
          • 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 a standalone OceanBase database by using the CLI
          • Deploy a two-replica OceanBase cluster with the arbitration service by using the CLI
          • Deploy a single-replica OceanBase cluster by using the CLI
          • Deploy a three-replica OceanBase cluster by 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 an OceanBase 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
      • Use Canal to synchronize data from OceanBase Database to a MySQL database
      • Use CloudCanal to migrate data from OceanBase Database to a MySQL database
      • Use Flink CDC to migrate data from OceanBase Database to a MySQL database
      • Use ChunJun to migrate data from OceanBase Database to a MySQL database
    • 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
      • 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
        • Online upgrade from standalone deployment to distributed deployment
        • 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
      • Tenant introduction
      • Tenant capacity
      • Tenant types
      • User tenant introduction
      • Tenant system variables
      • Common tenant operations
        • Create a tenant
        • Resource isolation
          • 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 the tenant allowlist
        • View tenant system variables
        • Modify system variables of a tenant
        • Scale in/out
          • Introduction to scaling in/out
          • 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
        • Recover a tenant
        • Rename a tenant
        • Manage resource pools
          • View resource pool information
          • Allocate a resource pool to a tenant
          • Remove resource pools from a tenant
          • Merge and split resource pools
          • Drop a resource pool
        • Manage unit configs
          • Query unit configs
          • Modify unit configs
          • Drop unit configs
    • Manage replicas
      • Overview
      • Replica distribution
        • Locality
        • Common locality 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
      • High availability overview
      • Multi-replica disaster recovery
        • Data link introduction
        • ODP high availability
        • 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
            • Set the log recovery endpoint
          • View log restore source information
          • View the log synchronization progress
          • Pause or resume log synchronization
          • Optimize the log synchronization performance
          • Set the log synchronization bandwidth limit
          • Set log synchronization compression
        • Log storage service
        • Switch roles
          • Overview of tenant roles
          • Switchover
          • Failover
        • Drop primary and standby tenants
      • 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
            • Query 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
        • Transparent data encryption test report
        • 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
        • Preparations
        • Enable ARCHIVELOG
        • Disable ARCHIVELOG
        • View information about pieces
        • View the archiving progress
        • View the archiving history
        • View the archiving parameter settings
        • Change the log archive destination
        • 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
        • Automatically clean up expired backup data
        • 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 physical restore
        • Cancel physical restore
        • View the physical restore progress
        • View physical restore results
        • Upgrade a tenant after restore
        • Convert a standby tenant into primary tenant
        • Replay logs to a standby tenant
        • Parameters related to physical restore
        • Views related to physical restore
      • Restore by table
        • Preparations
        • Perform table restore
        • Cancel table restore
        • View the table restore progress
        • View the table restore result
        • Parameters related to table restore
        • Views related to table 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 the data 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
        • SQL tuning system
        • Execution plan optimization
          • Statistical information and row estimation
            • Overview
            • Statistical information
              • Overview
              • Collect statistical information
                • Overview
                • Manually collect statistics
                • Automatically collect statistics
              • Query statistics
              • Manage statistical information
                • Overview
                • Delete and set statistics
                • Import and export statistics
                • Lock statistics
                • Query historical versions of statistics and roll back to a specified version
                • Configure statistics collection strategies
            • Row estimation
              • Overview
              • Row estimation based on the selectivity
              • Row estimation based on the storage layer
            • Use statistical information and row estimation
          • Plan management
            • Plan cache
            • Disadvantages of the plan cache and countermeasures
            • Views related to the plan cache
          • Index selection
            • Overview
            • Reduce row reads
            • Avoid table access by index primary key
            • Avoid sorting
          • Join order and join algorithm
            • Joins
            • Join algorithm
              • Nested loop joins
              • Hash joins
              • Merge joins
              • Common business issues
            • Join types
            • Join order
          • Order and limit optimization
            • Overview
            • SORT assignment and optimization
            • Optimization in ORDER BY + LIMIT scenarios
        • Business logic optimization
          • SQL specifications
          • Schema specifications
        • Locate and analyze slow queries I
        • Locate and analyze slow queries II
        • Typical scenarios and cases
    • 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
      • Physical standby database
        • Log synchronization stuck for the physical standby database
        • Switchover failures
      • Backup and restore
        • Data backup failures
        • Physical restore failures
    • Emergency response
      • Emergency response overview
      • Analysis, diagnosis, and decision-making procedure
      • Common emergency problem handling
        • Hardware issues
          • Node failure
          • Network failure
          • ODP failure
          • Other hardware and network issues
        • Capacity issues
          • Exceptions of SQL queries
          • Node disk I/O high
          • Node network card overload
          • Tenant memory full
          • obproxy thread exhaustion
          • Node clog disk full
          • Node data disk full
          • Tenant request queue backlog
        • Other cluster issues
          • sys tenant or RootService exceptions
          • Insufficiency or leakage of system memory
  • OBKV
    • Overview
    • Architecture
    • OBKV-Table
      • OBKV-Table
        • Overview
        • OBKV-Table operation types
        • Differences between replace and insert_or_update
        • Supported value types
        • OBKV-Table data models
      • Use the OBKV-Table Java client
        • Use the OBKV-Table Java client to connect to a cluster
        • Set client parameters
        • Supported client interfaces
        • Use the OBKV-Table Java client
      • Use the OBKV-Table GO client
        • Use the OBKV-Table Go client to connect to a cluster
        • Overview of the Go client
        • Individual API operations
        • Batch operations
        • About queries
        • Aggregation API
        • Filters
      • Delete expired data
      • FAQ
    • OBKV-HBase
      • Overview
      • Core features
      • Compatibility with HBase
      • Deployment
      • Use OBKV-HBase
        • Overview
        • Data model
        • Data model design
        • Connect to a cluster by using the OBKV-HBase client
        • Data operation examples
        • Delete expired data
      • OBKV-HBase management
        • Overview
        • High availability
        • Security and permissions
        • Monitoring metrics
      • Performance test
      • OBKV-HBase integration
        • Synchronize data to OBKV-HBase by using Flink
      • Views
      • FAQ
    • RPC message compression
  • Reference
    • System principles
      • 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
              • Datetime 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
            • About indexes
            • Local and global indexes
            • Unique and non-unique indexes
            • Use indexes
            • Index storage
          • Partitions
            • Overview
            • Partitioning keys
            • Partitioning types
            • Partitioned indexes
          • Views
            • Overview
            • View categorization
            • OceanBase-specific views
            • Oracle-compatible views
            • Data operations in views
            • Data access from views
            • Updatable views
          • Other objects
            • Sequences
            • Synonyms
          • System views
            • Dictionary views
            • Performance views
          • Data integrity
            • Overview
            • Integrity constraint type
              • Overview
              • NOT NULL constraints
              • UNIQUE KEY 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
              • Datetime data types
              • Character data types
              • LOB data types
              • Multi-model data types
              • Spatial data types
              • JSON data types
            • Integrity constraints
            • Table storage
            • Table compression
            • Partitioned table
            • Tables with and without a primary key
          • Indexes
            • About indexes
            • Local and global indexes
            • Unique and non-unique indexes
            • Spatial indexes
            • Use indexes
            • Index storage
          • Partitions
            • Overview
            • Partitioning keys
            • Partitioning types
            • Partitioned indexes
          • Views
            • Overview
            • View categorization
            • OceanBase-specific views
            • MySQL-compatible views
            • Oracle-compatible views in MySQL tenants
            • Oracle-compatible views in the sys tenant
            • Data operations in views
            • Data access from views
            • Updatable views
          • System views
            • Dictionary views
            • Performance views
          • 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
            • Overview
            • SQL data access
            • SQL standards
          • SQL statements
            • 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
          • SSTables
          • Compression and encoding
        • Compaction
          • Overview
          • Minor compaction
          • Major compaction
        • 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 failures
        • Deployment solutions for disaster recovery
        • Data protection
          • Overview
          • Flashback queries
          • Recycle bin
        • 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 alerting
        • Security audit
      • OBServer node architecture
        • Structure of the OBServer node installation 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 minor compaction information
          • Modify minor compaction settings
        • Major compaction management
          • Overview
          • Automatically trigger a major compaction
          • Configure scheduled major compactions
          • Adaptive major compactions
          • Manually initiate a major compaction
          • Manually control a major compaction
          • View the major compaction process
          • Modify major compaction settings
        • 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
        • FAQ about memory
      • 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
          • Rename a partition
          • 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
            • CANCEL RECOVER TABLE
            • MERGE
            • MIGRATE UNIT
            • DELETE BACKUP
            • FAILOVER
            • FLUSH PLAN CACHE
            • JOB
            • LOG RESTORE SOURCE
            • PARAMETER
            • RECOVER
            • REFRESH
            • RESTORE
            • RECOVER TABLE
            • 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
              • Datetime 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
              • Datetime 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
              • Datetime 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
              • Overview
              • 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_TABLE
              • 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_TIME
            • 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
            • CTE
            • 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
            • VALUES
          • DDL feature
            • Overview
            • Online and offline DDL operations
            • 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
              • Datetime 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
              • Datetime 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 non-schema 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
              • Datetime 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
                  • EXTRACTVALUE
                  • 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
              • ALTER SYSTEM KILL SESSION
              • 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
            • Online and offline DDL operations
            • 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
          • Others
        • 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
            • Triggers
            • 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_WORKLOAD_REPOSITORY
              • Overview
              • ASH_REPORT
              • CREATE_SNAPSHOT
              • DROP_SNAPSHOT_RANGE
              • MODIFY_SNAPSHOT_SETTINGS
            • 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
            • Declaration
            • Quote 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 an autonomous transaction
              • 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 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 execution of SQL statements
            • PL DBLink
          • 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
              • ISTEMPORARY
              • OPEN
              • READ
              • SUBSTR
              • TRIM
              • WRITE
              • WRITEAPPEND
            • DBMS_LOCK
              • Overview
              • ALLOCATE_UNIQUE
              • ALLOCATE_UNIQUE_AUTONOMOUS
              • REQUEST
              • 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)
    • System views
      • Overview
      • Overview of system views
      • Changes in views in OceanBase Database V3.x and V4.x
      • SYS tenant views
        • Dictionary views
          • 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
          • oceanbase.DBA_WR_SNAPSHOT
          • oceanbase.CDB_WR_SNAPSHOT
          • oceanbase.DBA_WR_ACTIVE_SESSION_HISTORY
          • oceanbase.CDB_WR_ACTIVE_SESSION_HISTORY
          • oceanbase.DBA_WR_STATNAME
          • oceanbase.CDB_WR_STATNAME
          • oceanbase.DBA_WR_SYSSTAT
          • oceanbase.CDB_WR_SYSSTAT
          • oceanbase.DBA_WR_CONTROL
          • oceanbase.CDB_WR_CONTROL
          • oceanbase.CDB_OB_RECOVER_TABLE_JOBS
          • oceanbase.DBA_OB_RECOVER_TABLE_JOBS
          • oceanbase.CDB_OB_IMPORT_TABLE_JOBS
          • oceanbase.DBA_OB_IMPORT_TABLE_JOBS
          • oceanbase.CDB_OB_IMPORT_TABLE_TASKS
          • oceanbase.DBA_OB_IMPORT_TABLE_TASKS
          • oceanbase.CDB_OB_RECOVER_TABLE_JOB_HISTORY
          • oceanbase.DBA_OB_RECOVER_TABLE_JOB_HISTORY
          • oceanbase.CDB_OB_IMPORT_TABLE_JOB_HISTORY
          • oceanbase.DBA_OB_IMPORT_TABLE_JOB_HISTORY
          • oceanbase.CDB_OB_IMPORT_TABLE_TASK_HISTORY
          • oceanbase.DBA_OB_IMPORT_TABLE_TASK_HISTORY
          • oceanbase.CDB_OB_KV_TTL_TASKS
          • oceanbase.CDB_OB_KV_TTL_TASK_HISTORY
          • oceanbase.DBA_OB_KV_TTL_TASKS
          • oceanbase.DBA_OB_KV_TTL_TASK_HISTORY
        • Performance views
          • GV$OB_COMPACTION_DIAGNOSE_INFO
          • GV$OB_COMPACTION_PROGRESS
          • GV$OB_COMPACTION_SUGGESTIONS
          • GV$OB_KVCACHE
          • GV$OB_PARAMETERS
          • GV$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$OB_ARBITRATION_MEMBER_INFO
          • V$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
          • GV$OB_TENANT_RUNTIME_INFO
          • V$OB_TENANT_RUNTIME_INFO
          • GV$OB_FLT_TRACE_CONFIG
      • MySQL tenant views
        • Dictionary views
          • information_schema.CHARACTER_SETS
          • information_schema.CHECK_CONSTRAINTS
          • information_schema.COLLATIONS
          • information_schema.COLLATION_CHARACTER_SET_APPLICABILITY
          • information_schema.COLUMNS
          • 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
          • information_schema.TABLE_PRIVILEGES
          • information_schema.USER_PRIVILEGES
          • information_schema.VIEW_TABLE_USAGE
          • information_schema.VIEWS
          • mysql.db
          • mysql.help_category
          • mysql.help_keyword
          • mysql.help_relation
          • mysql.help_topic
          • 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_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_ZONE_MAJOR_COMPACTION
          • 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.DBA_OB_BACKUP_SET_FILES
          • oceanbase.DBA_OB_BACKUP_JOBS
          • oceanbase.DBA_OB_BACKUP_JOB_HISTORY
          • oceanbase.DBA_OB_BACKUP_TASKS
          • oceanbase.DBA_OB_BACKUP_TASK_HISTORY
          • oceanbase.DBA_OB_ARCHIVELOG_PIECE_FILES
          • oceanbase.DBA_OB_RESTORE_PROGRESS
          • oceanbase.DBA_OB_RESTORE_HISTORY
          • oceanbase.DBA_OB_ARCHIVE_DEST
          • oceanbase.DBA_OB_ARCHIVELOG
          • oceanbase.DBA_OB_ARCHIVELOG_SUMMARY
          • oceanbase.DBA_OB_BACKUP_PARAMETER
          • oceanbase.DBA_OB_OUTLINE_CONCURRENT_HISTORY
          • oceanbase.DBA_OB_OUTLINES
          • oceanbase.DBA_OB_CONCURRENT_LIMIT_SQL
          • oceanbase.DBA_OB_BACKUP_DELETE_JOBS
          • oceanbase.DBA_OB_BACKUP_DELETE_JOB_HISTORY
          • oceanbase.DBA_OB_BACKUP_DELETE_TASKS
          • oceanbase.DBA_OB_BACKUP_DELETE_TASK_HISTORY
          • oceanbase.DBA_OB_BACKUP_STORAGE_INFO
          • oceanbase.DBA_OB_BACKUP_STORAGE_INFO_HISTORY
          • oceanbase.DBA_OB_BACKUP_DELETE_POLICY
          • oceanbase.DBA_OB_DEADLOCK_EVENT_HISTORY
          • 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.DBA_OB_LS
          • oceanbase.DBA_OB_TABLE_LOCATIONS
          • oceanbase.DBA_OB_FREEZE_INFO
          • oceanbase.DBA_OB_LS_REPLICA_TASKS
          • oceanbase.DBA_OB_AUTO_INCREMENT
          • oceanbase.DBA_SEQUENCES
          • oceanbase.DBA_SCHEDULER_WINDOWS
          • oceanbase.DBA_OB_USERS
          • oceanbase.DBA_OB_DATABASE_PRIVILEGE
          • oceanbase.DBA_OB_USER_DEFINED_RULES
          • oceanbase.DBA_OB_TENANTS
          • oceanbase.DBA_OB_LS_LOG_ARCHIVE_PROGRESS
          • oceanbase.DBA_OB_LS_ARB_REPLICA_TASKS
          • 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.DBA_OB_TASK_OPT_STAT_GATHER_HISTORY
          • oceanbase.DBA_OB_TABLE_OPT_STAT_GATHER_HISTORY
          • oceanbase.DBA_OB_LOG_RESTORE_SOURCE
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          • oceanbase.DBA_WR_STATNAME
          • oceanbase.DBA_WR_SYSSTAT
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          • oceanbase.DBA_OB_IMPORT_TABLE_JOBS
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          • oceanbase.DBA_OB_RECOVER_TABLE_JOB_HISTORY
          • oceanbase.DBA_OB_IMPORT_TABLE_JOB_HISTORY
          • oceanbase.DBA_OB_IMPORT_TABLE_TASK_HISTORY
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        • Performance views
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          • enable_ddl
          • enable_global_freeze_trigger
          • enable_log_archive
          • enable_election_group
          • enable_major_freeze
          • enable_merge_by_turn
          • enable_manual_merge
          • enable_ob_ratelimit
          • enable_one_phase_commit
          • enable_perf_event
          • enable_pg
          • enable_record_trace_id
          • enable_record_trace_log
          • enable_rereplication
          • enable_rich_error_msg
          • enable_separate_sys_clog
          • enable_smooth_leader_switch
          • enable_rootservice_standalone
          • enable_sql_audit
          • enable_sql_operator_dump
          • enable_sys_table_ddl
          • enable_sys_unit_standalone
          • enable_syslog_recycle
          • enable_syslog_wf
          • enable_tcp_keepalive
          • fast_recovery_concurrency
          • enable_upgrade_mode
          • flush_log_at_trx_commit
          • gc_wait_archive
          • fuse_row_cache_priority
          • global_index_build_single_replica_timeout
          • global_major_freeze_residual_memory
          • get_leader_candidate_rpc_timeout
          • global_write_halt_residual_memory
          • high_priority_net_thread_count
          • ignore_replay_checksum_error
          • ignore_replica_checksum_error
          • index_clog_cache_priority
          • index_info_block_cache_priority
          • index_cache_priority
          • ilog_index_expire_time
          • internal_sql_execute_timeout
          • large_query_threshold
          • large_query_worker_percentage
          • leak_mod_to_check
          • lease_time
          • location_cache_cpu_quota
          • location_cache_priority
          • location_cache_expire_time
          • location_cache_refresh_min_interval
          • 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
          • sql_protocol_min_tls_version
        • 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
          • enable_transfer
          • kv_ttl_duty_duration
          • kv_ttl_history_recycle_interval
          • enable_kv_ttl
          • ttl_thread_score
          • compaction_dag_cnt_limit
          • compaction_schedule_tablet_batch_cnt
      • System variables
        • Overview
        • 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
          • optimizer_features_enable
        • 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
          • 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 logs
        • 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
          • Routing parameters on nodes
      • Business model tuning
        • Load balancing
        • SQL diagnostics
        • Distributed transactions
      • Performance diagnosis
        • Monitor and diagnose the cluster performance
        • Diagnose tenant performance
        • Monitor ODP performance
        • Monitor host performance
        • WR management
          • Overview
          • Manage WR
          • Monitor historical session performance
          • Clean up WR data
        • ASH report
          • ASH
          • Generate ASH reports
          • Analyze ASH reports
      • SQL tuning
        • Execution process of SQL queries
        • 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
          • Real-time execution plan display
          • SQL tuning practice with EXPLAIN
        • Distributed execution plans
          • Perform distributed execution and parallel queries
          • Generate a distributed plan
          • Schedule distributed execution plans
          • Manage distributed execution plans
          • Parallel execution enabling methods and their priority
          • Auto DOP
          • Execute parallel queries
          • Perform parameter tuning for a parallel query
          • Parallel DML
        • SQL tuning
          • Overview
          • General procedure
          • 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 SQL traffic distribution and QPS
              • 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 certain 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
              • Delete statistics
              • Set statistics
              • Import and export statistics
              • Lock and unlock statistics
              • Manage statistics history
              • Manage statistics preferences
            • Monitoring and diagnostics for statistics collection
            • Examples
          • Query rewrite
            • Overview
            • Rule-based query rewrite
            • Cost-based query rewrite
          • Query optimization
            • Access path
              • Overview
              • Rule-based path selection
              • Cost-based path selection
            • Join algorithm
              • Overview
              • Join algorithms
              • Runtime filters
              • 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
      • Connection and routing
      • 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
      • OCP Express
        • OCP Express
        • View cluster overview information
        • Tenant management
        • Monitor a cluster
        • Diagnostic analysis
        • Log service
      • 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
        • OBLogProxy
        • 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
          • 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
    • Products
    • SQL statements
    • Deployment
    • Cluster management
    • High availability
  • Release Notes
    • Version rules
    • OceanBase Database Enterprise Edition
      • V4.2
        • OceanBase Database Enterprise Edition V4.2.1
        • 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 V4.2.1
        • 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
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ORA-10000 to ORA-19999

Last Updated:2023-12-25 08:49:40  Updated
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What is on this page
ORA-12401: invalid label string
ORA-12416: policy string not found
ORA-12432: LBAC error: %s
ORA-12444: policy already applied to table
ORA-12447: policy role already exists for policy string
ORA-12461: undefined level string for policy string
ORA-12462: undefined compartment string for policy string
ORA-12463: undefined group string for policy string
ORA-12470: NULL or invalid user label: %s
ORA-12702: invalid NLS parameter string used in SQL function
ORA-12704: COLLATION '%.*s' is not valid for CHARACTER SET '%.*s'
ORA-12704: character set mismatch
ORA-12705: Cannot access NLS data files or invalid environment specified
ORA-12725: unmatched parentheses in regular expression
ORA-12726: unmatched bracket in regular expression
ORA-12727: invalid back reference in regular expression
ORA-12728: invalid range in regular expression
ORA-12729: invalid character class in regular expression
ORA-12731: invalid collation class in regular expression
ORA-12801: error signaled in parallel query server
ORA-12827: insufficient parallel query worker available
ORA-12899: value too large for column '%.*s' at row %ld
ORA-12991: column is referenced in a multi-column constraint
ORA-12991: column \'%.*s\' is referenced in a multi-column constraint \'%.*s\'
ORA-12992: cannot drop parent key column
ORA-13207: incorrect use of the ['%.*s'] operator
ORA-14019: partition bound element must be one of: string, datetime or interval literal, number, or MAXVALUE
ORA-14019: partition bound element must be one of: string, datetime or interval literal, number, or MAXVALUE
ORA-14020: this physical attribute may not be specified for a table partition
ORA-14036: partition bound value too large for column
ORA-14037: partition bound of partition '%.*s' is too high
ORA-14047: ALTER TABLE|INDEX RENAME may not be combined with other operations
ORA-14060: data type or length of a table partitioning column may not be changed
ORA-14074: partition bound must collate higher than that of the last partition
ORA-14082: New partition name %.*s must differ from that of any other partition or subpartition of the object.
ORA-14100: partition extended table name cannot refer to a remote object
ORA-14109: partition-extended object names may only be used with tables and editioning views
ORA-14159: duplicate subpartition name
ORA-14170: cannot specify <(sub)partition-description> clause in CREATE TABLE or CREATE INDEX
ORA-14214: VALUES (<value list>) cannot be used for Range subpartitioned tables
ORA-14217: VALUES (<value list>) clause expected
ORA-14251: Specified subpartition does not exist
ORA-14253: table is not partitioned by composite partition method
ORA-14263: New subpartition name %.*s must differ from that of any other partition or subpartition of the object.
ORA-14265: data type or length of a table subpartitioning column may not be changed
ORA-14300: partitioning key maps to a partition outside maximum permitted number of partitions
ORA-14308: partition bound element must be one of: string, datetime or interval literal, number, or NULL
ORA-14310: VALUES LESS THAN or AT clause cannot be used with List partitioned tables
ORA-14311: Expecting VALUES LESS THAN or AT clause
ORA-14312: invalid time limit specified
ORA-14318: DEFAULT partition must be last partition specified
ORA-14400: inserted partition key does not map to any partition
ORA-14402: updating partition key column would cause a partition change
ORA-14501: object is not partitioned
ORA-14551: cannot perform a DML operation inside a query
ORA-14552: cannot perform a DDL commit or rollback inside a query or DML tips
ORA-14750: Range partitioned table with INTERVAL clause has more than one column
ORA-14751: Invalid data type for partitioning column of an interval partitioned table
ORA-14752: Interval expression is not a constant of the correct type
ORA-14753: Interval cannot be zero
ORA-14757: Table is already a range partitioned table
ORA-14758: Last partition in the range section cannot be dropped
ORA-14759: SET INTERVAL is not legal on this table
ORA-14760: ADD PARTITION is not permitted on Interval partitioned objects
ORA-14761: MAXVALUE partition cannot be specified for Interval partitioned objects
ORA-14767: Cannot specify this interval with existing high bounds
ORA-16000: standby tenant is read only
ORA-19010: Cannot insert XML fragments
ORA-19012: Cannot convert XML fragment to the required datatype
ORA-19025: EXTRACTVALUE cannot extract values of multiple nodes
ORA-19026: EXTRACTVALUE can only retrieve value of leaf nodetoo small.
ORA-19044: character length specified for XMLSerialize is too small.
ORA-19208: parameter %d of function XMLELEMENT must be aliased

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Applicability

This topic applies only to OceanBase Database Enterprise Edition. OceanBase Database Community Edition provides only the MySQL mode.

ORA-12401: invalid label string

  • OceanBase error code: 5696

  • SQLSTATE: HY000

  • Cause: The strategy cannot convert the label string into a valid internal label.

  • Solution: Correct the syntax of the label string.

ORA-12416: policy string not found

  • OceanBase error code: 5695

  • SQLSTATE: HY000

  • Cause: The specified strategy does not exist in the database.

  • Solution: Enter a correct strategy name or create a strategy.

ORA-12432: LBAC error: %s

  • OceanBase error code: 5700

  • SQLSTATE: HY000

  • Cause: Label-based access control (LBAC) is performed.

  • Solution: Correct the problem identified in the error message.

ORA-12444: policy already applied to table

  • OceanBase error code: 5790

  • SQLSTATE: HY000

  • Cause: You are applying a strategy to a table that is already under strategy protection.

  • Solution: If you need to modify the table options, predicate, or label function, you must first remove the strategy from the table and then reapply it.

ORA-12447: policy role already exists for policy string

  • OceanBase error code: 5701

  • SQLSTATE: HY000

  • Cause: A strategy with the specified name already exists.

  • Solution: Change the strategy name or delete the existing strategy.

ORA-12461: undefined level string for policy string

  • OceanBase error code: 5698

  • SQLSTATE: HY000

  • Cause: The specified level is not defined for the strategy.

  • Solution: Specify a level identifier value for the strategy.

ORA-12462: undefined compartment string for policy string

  • OceanBase error code: 5697

  • SQLSTATE: HY000

  • Cause: The specified component is not defined for the strategy.

  • Solution: Specify a component identifier value for the strategy.

ORA-12463: undefined group string for policy string

  • OceanBase error code: 5699

  • SQLSTATE: HY000

  • Cause: The specified group is not defined for the strategy.

  • Solution: Specify a group identifier value for the strategy.

ORA-12470: NULL or invalid user label: %s

  • OceanBase error code: 5702

  • SQLSTATE: HY000

  • Cause: The entered user label is NULL or is beyond the authorization for the user.

  • Solution: Enter an authorized label for the user.

ORA-12702: invalid NLS parameter string used in SQL function

  • OceanBase error code: 5604

  • SQLSTATE: HY000

  • Cause: An unknown argument name or an invalid value is specified in the NLS argument string.

ORA-12704: COLLATION '%.*s' is not valid for CHARACTER SET '%.*s'

  • OceanBase error code: 5144

  • SQLSTATE: 42000

  • Cause:

    • Different character sets are used for the string operands (excluding nlsparams) of the operator or built-in function.

    • The nlsparams operand is not contained in the character set of the database.

    • A character set other than the character set of the database is used for the string data passed to the built-in function, but the built-in function does not support the character set in use.

    • The second argument of CHR() or CSCONVERT() is not CHAR_CS or NCHAR_CS.

    • The character set of the string expression in the VALUES clause of the INSERT statement or the SET clause of the UPDATE statement is different from the character set used by the column to be inserted.

    • In the table creation statement, the character set used for the values in the DEFAULT clause is different from the character set declared for the column.

    • An argument of the PL function does not meet the character set requirements of the argument.

ORA-12704: character set mismatch

  • OceanBase error code: 5808

  • SQLSTATE: HY000

  • Cause:

    • Different character sets are used for the string operands (excluding nlsparams) of the operator or built-in function.

    • The nlsparams operand is not contained in the character set of the database.

    • A character set other than the character set of the database is used for the string data passed to the built-in function, but the built-in function does not support the character set in use.

    • The second argument of CHR() or CSCONVERT() is not CHAR_CS or NCHAR_CS.

    • The character set of the string expression in the VALUES clause of the INSERT statement or the SET clause of the UPDATE statement is different from the character set used by the column to be inserted.

    • In the table creation statement, the character set used for the values in the DEFAULT clause is different from the character set declared for the column.

    • An argument of the PL function does not meet the character set requirements of the argument.

ORA-12705: Cannot access NLS data files or invalid environment specified

  • OceanBase error code: 5943

  • SQLSTATE: HY000

  • Cause:

    • An invalid NLS parameter or value is specified in the ALTER SESSION statement.

    • The name of environment variable NLS_LANG, ORA_NLSxx, or ORACLE_HOME is incorrectly spelled, and therefore the NLS data file cannot be found.

  • Solution:

    • Check the syntax of the ALTER SESSION statement and the NLS parameter, correct the syntax errors, and try this statement again.

    • Ensure that the name of the environment variable is correctly spelled.

ORA-12725: unmatched parentheses in regular expression

  • OceanBase error code: 5813

  • SQLSTATE: HY000

  • Cause: Parentheses (()) in the regular expression do not appear in pairs.

  • Solution: Ensure that the parentheses are symmetric.

ORA-12726: unmatched bracket in regular expression

  • OceanBase error code: 5812

  • SQLSTATE: HY000

  • Cause: Square brackets ([]) in the regular expression do not appear in pairs.

  • Solution: Ensure that the parentheses are symmetric.

ORA-12727: invalid back reference in regular expression

  • OceanBase error code: 5814

  • SQLSTATE: HY000

  • Cause: The subexpression contains a back reference.

  • Solution: Make sure that the referenced subexpression is valid.

ORA-12728: invalid range in regular expression

  • OceanBase error code: 5815

  • SQLSTATE: HY000

  • Cause: An invalid range is found in the regular expression.

  • Solution: Ensure that a valid range is used.

ORA-12729: invalid character class in regular expression

  • OceanBase error code: 5816

  • SQLSTATE: HY000

  • Cause: An unknown character class is found in the regular expression.

  • Solution: Use a valid character class.

ORA-12731: invalid collation class in regular expression

  • OceanBase error code: 5817

  • SQLSTATE: HY000

  • Cause: An unknown collation class is found in the regular expression.

  • Solution: Use a valid collation class.

ORA-12801: error signaled in parallel query server

  • OceanBase error code: 5736

  • SQLSTATE: HY000

  • Cause: When Parallel eXecution (PX) needs to be terminated, this error code is broadcasted to all execution nodes to terminate the current execution.

  • Solution: Find the cause of interruption in the execution log or contact OceanBase Technical Support for troubleshooting.

ORA-12827: insufficient parallel query worker available

  • OceanBase error code: 5345

  • SQLSTATE: HY000

  • Cause: The parallel_servers_target parameter is specified, but the number of obtained slaves is less than the specified lower limit or reaches the upper limit.

  • Solution: Increase the value of parallel_servers_target and execute the query again, or wait for slaves to be released after some ongoing queries are completed.

ORA-12899: value too large for column '%.*s' at row %ld

  • OceanBase error code: 5167

  • SQLSTATE: 22001

  • Cause: The column value to be inserted or updated exceeds the width limit.

  • Solution: Check the correctness of the SQL statement. Check the data types of the source and destination columns. Increase the width of the destination column or use a subset, namely, a substring, of the source column.

ORA-12991: column is referenced in a multi-column constraint

  • OceanBase error code: 5792

  • SQLSTATE: HY000

  • Cause: You are attempting to delete a column referenced by some constraints.

  • Solution: Delete all constraints that reference the column or specify CASCADE CONSTRAINTS in the statement.

ORA-12991: column \'%.*s\' is referenced in a multi-column constraint \'%.*s\'

  • OceanBase error code: 5859

  • SQLSTATE: HY000

  • Cause: You are attempting to delete a column referenced by some constraints.

  • Solution: Delete all constraints that reference the column or specify CASCADE CONSTRAINTS in the statement.

ORA-12992: cannot drop parent key column

  • OceanBase error code: 5793

  • SQLSTATE: HY000

  • Cause: You are attempting to drop a parent key column.

  • Solution: Delete all constraints that reference this parent key column, or specify CASCADE CONSTRAINTS in the statement.

ORA-13207: incorrect use of the ['%.*s'] operator

  • OceanBase error code: 5804

  • SQLSTATE: HY000

  • Cause: An error occurred while using the specified operator.

  • Solution: Check the parameters and return type of the operator.

ORA-14019: partition bound element must be one of: string, datetime or interval literal, number, or MAXVALUE

  • OceanBase error code: 5275

  • SQLSTATE: HY000

  • Cause: The partition bound list contains elements of invalid types. To be specific, the elements are not digits, null strings, datetime, interval literals, or MAXVALUE.

  • Solution: Ensure that all elements in the partition bound list are of valid types.

ORA-14019: partition bound element must be one of: string, datetime or interval literal, number, or MAXVALUE

  • OceanBase error code: 5285

  • SQLSTATE: HY000

  • Cause: The partition bound list contains elements of invalid types. To be specific, the elements are not digits, null strings, datetime, interval literals, or MAXVALUE.

  • Solution: Make sure that all elements in the partition bound list are of valid types.

ORA-14020: this physical attribute may not be specified for a table partition

  • OceanBase error code: 4398
  • SQLSTATE: HY000
  • Cause: You have specified an incompatible partitioning method when you create the partitioned table. For example, you may have specified RANGE-LIST partitioning and HASH-KEY partitioning.
  • Solution:
    • Change the partitioning method. If you want to use both RANGE-LIST partitioning and HASH-KEY partitioning, you can use a compatible partitioning method. Note that changing the partitioning method or partitioning a partitioned table may affect the existing data and applications. Proceed with caution.
    • Separate the partitions: If you need to use incompatible partitioning methods, you can split the partitioned table into multiple tables and use different partitioning methods for the tables.

Note

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

ORA-14036: partition bound value too large for column

  • OceanBase error code: 5354

  • SQLSTATE: 22001

  • Cause: The length of a partition bound value exceeds that of the corresponding partitioning column.

  • Solution: Make sure that the upper bounds of partitions do not exceed the lengths of the corresponding partitioning columns.

ORA-14037: partition bound of partition '%.*s' is too high

  • OceanBase error code: 5281

  • SQLSTATE: HY000

  • Cause: The upper bound of a partition is greater than that of the next partition.

  • Solution: Make sure that the upper bound of each partition, except for the last partition, is less than that of the next partition.

ORA-14047: ALTER TABLE|INDEX RENAME may not be combined with other operations

  • OceanBase error code: 5863

  • SQLSTATE: HY000

  • Cause: The ALTER TABLE or ALTER INDEX statement attempted to combine the RENAME operation with other operations, which is not allowed.

  • Solution: Make sure that the ALTER TABLE or ALTER INDEX statement contains only the RENAME operation.

ORA-14060: data type or length of a table partitioning column may not be changed

  • OceanBase error code: 5895

  • SQLSTATE: HY000

  • Cause: The ALTER TABLE statement is used to modify the data type or length of a partitioning column in a table named by using the ALTER TABLE statement.

  • Solution: Do not modify the data type or length of partitioning columns in a table.

ORA-14074: partition bound must collate higher than that of the last partition

  • OceanBase error code: 5353

  • SQLSTATE: HY000

  • Cause: The partition bound specified in the ALTER TABLE ADD PARTITION statement is not higher than the bound of the last partition in the table.

  • Solution: Make sure that the bound of the partition to be added is higher than that of the last partition in the table.

ORA-14082: New partition name %.*s must differ from that of any other partition or subpartition of the object.

  • OceanBase error code: 5493
  • SQLSTATE: HY000
  • Cause: When you modify the name of a partition of a table, the new name is already taken by an existing partition or subpartition.
  • Solution: Use another name or delete the existing partition or subpartition with the name.

Note

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

ORA-14100: partition extended table name cannot refer to a remote object

  • OceanBase error code: 5899

  • SQLSTATE: HY000

  • Cause: You are attempting to name a remote object by using partition-extended table syntax.

  • Solution: Correct the expression and retry.

ORA-14109: partition-extended object names may only be used with tables and editioning views

  • OceanBase error code: 5977

  • SQLSTATE: HY000

  • Cause: You are attempting to use a partition-extended object name for an object which was not a table or an editioning view.

  • Solution: Do not use the partition-extended name syntax for objects other than tables or editioning views.

Note

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

ORA-14159: duplicate subpartition name

  • OceanBase error code: 5867

  • SQLSTATE: HY000

  • Cause: The name of a subpartition of the table or index is not unique.

  • Solution: Rename the subpartition to make sure that its name is unique among subpartitions of the table or index.

ORA-14170: cannot specify <(sub)partition-description> clause in CREATE TABLE or CREATE INDEX

  • OceanBase error code: 5866

  • SQLSTATE: HY000

  • Cause: The request generates a default partition description (possibly through PARTITIONS number-of-partitions) and specifies the <(sub)partition-description> clause, which is not allowed.

  • Solution: Delete one of the clauses.

ORA-14214: VALUES (<value list>) cannot be used for Range subpartitioned tables

  • OceanBase error code: 5876

  • SQLSTATE: HY000

  • Cause: The VALUES (value list) clause is used for RANGE-subpartitioned tables.

  • Solution: Use the VALUES LESS THAN or AT clause for RANGE-subpartitioned tables.

ORA-14217: VALUES (<value list>) clause expected

  • OceanBase error code: 5877

  • SQLSTATE: HY000

  • Cause: The VALUES (value list) clause is not specified for a LIST-subpartitioned table.

  • Solution: Specify the VALUES (value list) clause.

ORA-14251: Specified subpartition does not exist

  • OceanBase error code: 5830

  • SQLSTATE: HY000

  • Cause: No subpartition is found for the object.

  • Solution: Use the valid subpartition name and try again.

ORA-14253: table is not partitioned by composite partition method

  • OceanBase error code: 5875

  • SQLSTATE: HY000

  • Cause: The possible causes are as follows:

    • The table in a subpartition maintenance operation, such as ALTER TABLE [EXCHANGE | MODIFY | MOVE | TRUNCATE] SUBPARTITION or ALTER TABLE MODIFY PARTITION [ADD | COALESCE] SUBPARTITION, is not partitioned by using the composite partitioning method.

    • The table in the MODIFY DEFAULT ATTRIBUTES FOR PARTITION operation is partitioned by using a method other than composite partitioning.

    • The table in the ALTER TABLE MODIFY SUBPARTITION [UNUSABLE LOCAL INDEXES | REBUILD UNUSABLE LOCAL INDEXES] statement is not partitioned by using the composite partitioning method.

  • Solution: Make sure that the table is partitioned by using the composite partitioning method.

ORA-14263: New subpartition name %.*s must differ from that of any other partition or subpartition of the object.

  • OceanBase error code: 5494
  • SQLSTATE: HY000
  • Cause: When you modify the name of a subpartition of a table, the new name is already taken by an existing partition or subpartition.
  • Solution: Use another name or delete the existing partition or subpartition with the name.

Note

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

ORA-14265: data type or length of a table subpartitioning column may not be changed

  • OceanBase error code: 5896

  • SQLSTATE: HY000

  • Cause: The ALTER TABLE statement is used to modify the data type or length of a column used to partition a table named by using the ALTER TABLE statement.

  • Solution: Do not modify the data type or length of table subpartitioning columns.

ORA-14300: partitioning key maps to a partition outside maximum permitted number of partitions

  • OceanBase error code: 6274

  • SQLSTATE: HY000

  • Cause: The inserted row had a partitioning key that maps to a partition number greater than 1,048,575.

  • Solution: Make sure that the partitioning key maps to no more than 1,048,575 partitions or subpartitions.

Note

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

ORA-14308: partition bound element must be one of: string, datetime or interval literal, number, or NULL

  • OceanBase error code: 5355

  • SQLSTATE: HY000

  • Cause: The partition bound list contains elements of invalid types, which are not digits, null strings, datetime, interval literals, or NULL.

  • Solution: Ensure that all elements in the partition bound list are of valid types.

ORA-14310: VALUES LESS THAN or AT clause cannot be used with List partitioned tables

  • OceanBase error code: 5878

  • SQLSTATE: HY000

  • Cause: The VALUES LESS THAN or VALUES LESS AT clause can be used only for RANGE-partitioned tables.

  • Solution: Use the VALUES (value list) clause for LIST-partitioned tables.

ORA-14311: Expecting VALUES LESS THAN or AT clause

  • OceanBase error code: 5879

  • SQLSTATE: HY000

  • Cause: The VALUES (value list) clause can be used only for LIST-partitioned tables.

  • Solution: Use the VALUES LESS THAN clause for RANGE-partitioned tables.

ORA-14312: invalid time limit specified

  • OceanBase error code: 5882

  • SQLSTATE: HY000

  • Cause: A non-positive value is specified for the time parameter of the dbms_lock.sleep(time) package.

  • Solution: Specify a positive value.

ORA-14318: DEFAULT partition must be last partition specified

  • OceanBase error code: 5491
  • SQLSTATE: 42000
  • Cause: The DEFAULT partition must be the last specified partition.

Note

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

ORA-14400: inserted partition key does not map to any partition

  • OceanBase error code: 5284

  • SQLSTATE: HY000

  • Cause:

    • You are attempting to insert a record to a RANGE or COMPOSITE RANGE object, but the concatenated partitioning key included in the RANGE or COMPOSITE RANGE object is beyond the concatenated partition bound list of the last partition.

    • You are attempting to insert a record to a LIST object, but the partitioning key included in this object does not match the specified literal value of any partition.

  • Solution: Do not insert this key, add a partition that accepts this key, or add a value matching this key to the partition configuration.

ORA-14402: updating partition key column would cause a partition change

  • OceanBase error code: 5350

  • SQLSTATE: HY000

  • Cause: The UPDATE operation caused a change of the partition to which the row belongs.

  • Solution: Enable the enable row movement attribute for the table.

ORA-14501: object is not partitioned

  • OceanBase error code: 5829

  • SQLSTATE: HY000

  • Cause: The table or index is not partitioned. The syntax is invalid.

  • Solution: Retry the command with the valid syntax.

ORA-14551: cannot perform a DML operation inside a query

  • OceanBase error code: 9709

  • SQLSTATE: HY000

  • Cause: A DML operation like INSERT, UPDATE, DELETE, or SELECT-for-UPDATE cannot be performed inside a query or under a PDML slave.

  • Solution: Make sure that the offending DML operation is not performed, or use an autonomous transaction to perform the DML operation within the query or PDML slave.

Note

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

ORA-14552: cannot perform a DDL commit or rollback inside a query or DML tips

  • OceanBase error code: 9710

  • SQLSTATE: HY000

  • Cause: DDL operations (such as creating tables or views) and transaction control statements (such as commit and rollback) cannot be performed inside a query or a DML statement.

  • Solution: Make sure that the offending operation is not performed, or use autonomous transactions to perform the operation within the query or DML statement.

Note

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

ORA-14750: Range partitioned table with INTERVAL clause has more than one column

  • OceanBase error code: 5997

  • SQLSTATE: HY000

  • Cause: You are attempting to create an interval-partitioned table with more than one partitioning columns.

  • Solution: Use a single partitioning column.

Note

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

ORA-14751: Invalid data type for partitioning column of an interval partitioned table

  • OceanBase error code: 5998

  • SQLSTATE: HY000

  • Cause: You are attempting to use interval partitioning on a table partitioned on a column whose data type is not number or date/time.

  • Solution: Use only number or date/time columns as partitioning columns for interval-partitioned tables.

Note

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

ORA-14752: Interval expression is not a constant of the correct type

  • OceanBase error code: 5999

  • SQLSTATE: HY000

  • Cause: You are attempting to use either a nonconstant interval or an interval whose data type does not correspond to the partitioning column.

  • Solution: Use only constant expressions for the interval. If the data type of the partitioning column is numeric, the interval must be a numeric constant. If the data type is date/time, the interval must be a constant of the interval type.

Note

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

ORA-14753: Interval cannot be zero

  • OceanBase error code: 6273

  • SQLSTATE: HY000

  • Cause: The interval mapped to zero.

  • Solution: Use a non-zero interval.

Note

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

ORA-14757: Table is already a range partitioned table

  • OceanBase error code: 6000

  • SQLSTATE: HY000

  • Cause: SET INTERVAL() is used to convert an interval-partitioned table to a RANGE-partitioned table. You are not allowed to use SET INTERVAL() on a RANGE-partitioned table.

  • Solution: Use SET INTERVAL() only on an interval-partitioned table.

Note

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

ORA-14758: Last partition in the range section cannot be dropped

  • OceanBase error code: 4730

  • SQLSTATE: HY000

  • Cause: You are attempting to drop the last RANGE partition of an interval-partitioned table.

  • Solution: Do not drop the last RANGE partition of an interval-partitioned table.

Note

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

ORA-14759: SET INTERVAL is not legal on this table

  • OceanBase error code: 4731

  • SQLSTATE: HY000

  • Cause: The SET INTERVAL clause was specified. ALTER TABLE SET INTERVAL is allowed only on a RANGE-partitioned table with a single partitioning column. Additionally, this table cannot have a MAXVALUE partition.

  • Solution: Use SET INTERVAL only on a valid table.

Note

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

ORA-14760: ADD PARTITION is not permitted on Interval partitioned objects

  • OceanBase error code: 6269

  • SQLSTATE: HY000

  • Cause: You are attempting to execute the ALTER TABLE ADD PARTITION statement on an interval-partitioned object to add a partition.

  • Solution: Do not perform the operation on an interval-partitioned object. To add a partition, insert a row into the object.

ORA-14761: MAXVALUE partition cannot be specified for Interval partitioned objects

  • OceanBase error code: 6270

  • SQLSTATE: HY000

  • Cause: You are attempting to create a partition or subpartition with a MAXVALUE high bound on an interval-partitioned or interval-subpartitioned object.

  • Solution: Do not create a partition or subpartition with a MAXVALUE high bound.

ORA-14767: Cannot specify this interval with existing high bounds

  • OceanBase error code: 6271

  • SQLSTATE: HY000

  • Cause: The interval specified conflicts with the existing high bound for the last partition. The combination might lead to invalid dates for high bounds in the future

  • Solution: If you are executing CREATE TABLE, try to specify a different high bound value for the last partition or specify a different interval. If you are executing ALTER TABLE SET INTERVAL, choose either a different interval, or modify the table to change the high bound for the last partition.

ORA-16000: standby tenant is read only

  • OceanBase error code: 4688

  • SQLSTATE: HY000

  • Cause: The standby cluster supports only read operations. This error is returned when you execute write statements, such as DDL statements.

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

ORA-19010: Cannot insert XML fragments

  • OceanBase error code: 7411
  • SQLSTATE: 42000
  • Cause: The XML file to be inserted is invalid.
  • Solution:
    1. Make sure that the XML data to be inserted is complete and conforms to the XML specifications.
    2. Use the XMLType data type, so that you can store the XML data in a separate XMLType column.

Note

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

ORA-19012: Cannot convert XML fragment to the required datatype

  • OceanBase error code: 7406
  • SQLSTATE: 42000
  • Cause: The XML fragment cannot be converted to the required data type.
  • Solution: Make sure that the data type and XML data are correct.

Note

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

ORA-19025: EXTRACTVALUE cannot extract values of multiple nodes

  • OceanBase error code: 7405
  • SQLSTATE: 42000
  • Cause: The EXTRACTVALUE function cannot extract values from multiple nodes.
  • Solution: Use other functions or redesign the XPath expression for the query.

Note

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

ORA-19026: EXTRACTVALUE can only retrieve value of leaf nodetoo small.

  • OceanBase error code: 7410
  • SQLSTATE: 42000
  • Cause: The EXTRACTVALUE function tried to extract a value from a non-leaf node.
  • Solution: Make sure that the specified XPath expression is correct and points to a leaf node.

Note

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

ORA-19044: character length specified for XMLSerialize is too small.

  • OceanBase error code: 7408
  • SQLSTATE: 42000
  • Cause: The character length specified for the XMLSerialize function is too short.
  • Solution: Check the specified character length and data size, and make sure that all data can be accommodated.

Note

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

ORA-19208: parameter %d of function XMLELEMENT must be aliased

  • OceanBase error code: 7413
  • SQLSTATE: 42000
  • Cause: The Nth parameter of the XMLELEMENT () function does not have an alias.
  • Solution:
    1. Make sure that the attribute syntax of the XMLELEMENT() function is correct and valid.
    2. Make sure that aliases are specified for attribute parameters of the XMLELEMENT () function.

Note

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

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ORA-12401: invalid label string
ORA-12416: policy string not found
ORA-12432: LBAC error: %s
ORA-12444: policy already applied to table
ORA-12447: policy role already exists for policy string
ORA-12461: undefined level string for policy string
ORA-12462: undefined compartment string for policy string
ORA-12463: undefined group string for policy string
ORA-12470: NULL or invalid user label: %s
ORA-12702: invalid NLS parameter string used in SQL function
ORA-12704: COLLATION '%.*s' is not valid for CHARACTER SET '%.*s'
ORA-12704: character set mismatch
ORA-12705: Cannot access NLS data files or invalid environment specified
ORA-12725: unmatched parentheses in regular expression
ORA-12726: unmatched bracket in regular expression
ORA-12727: invalid back reference in regular expression
ORA-12728: invalid range in regular expression
ORA-12729: invalid character class in regular expression
ORA-12731: invalid collation class in regular expression
ORA-12801: error signaled in parallel query server
ORA-12827: insufficient parallel query worker available
ORA-12899: value too large for column '%.*s' at row %ld
ORA-12991: column is referenced in a multi-column constraint
ORA-12991: column \'%.*s\' is referenced in a multi-column constraint \'%.*s\'
ORA-12992: cannot drop parent key column
ORA-13207: incorrect use of the ['%.*s'] operator
ORA-14019: partition bound element must be one of: string, datetime or interval literal, number, or MAXVALUE
ORA-14019: partition bound element must be one of: string, datetime or interval literal, number, or MAXVALUE
ORA-14020: this physical attribute may not be specified for a table partition
ORA-14036: partition bound value too large for column
ORA-14037: partition bound of partition '%.*s' is too high
ORA-14047: ALTER TABLE|INDEX RENAME may not be combined with other operations
ORA-14060: data type or length of a table partitioning column may not be changed
ORA-14074: partition bound must collate higher than that of the last partition
ORA-14082: New partition name %.*s must differ from that of any other partition or subpartition of the object.
ORA-14100: partition extended table name cannot refer to a remote object
ORA-14109: partition-extended object names may only be used with tables and editioning views
ORA-14159: duplicate subpartition name
ORA-14170: cannot specify <(sub)partition-description> clause in CREATE TABLE or CREATE INDEX
ORA-14214: VALUES (<value list>) cannot be used for Range subpartitioned tables
ORA-14217: VALUES (<value list>) clause expected
ORA-14251: Specified subpartition does not exist
ORA-14253: table is not partitioned by composite partition method
ORA-14263: New subpartition name %.*s must differ from that of any other partition or subpartition of the object.
ORA-14265: data type or length of a table subpartitioning column may not be changed
ORA-14300: partitioning key maps to a partition outside maximum permitted number of partitions
ORA-14308: partition bound element must be one of: string, datetime or interval literal, number, or NULL
ORA-14310: VALUES LESS THAN or AT clause cannot be used with List partitioned tables
ORA-14311: Expecting VALUES LESS THAN or AT clause
ORA-14312: invalid time limit specified
ORA-14318: DEFAULT partition must be last partition specified
ORA-14400: inserted partition key does not map to any partition
ORA-14402: updating partition key column would cause a partition change
ORA-14501: object is not partitioned
ORA-14551: cannot perform a DML operation inside a query
ORA-14552: cannot perform a DDL commit or rollback inside a query or DML tips
ORA-14750: Range partitioned table with INTERVAL clause has more than one column
ORA-14751: Invalid data type for partitioning column of an interval partitioned table
ORA-14752: Interval expression is not a constant of the correct type
ORA-14753: Interval cannot be zero
ORA-14757: Table is already a range partitioned table
ORA-14758: Last partition in the range section cannot be dropped
ORA-14759: SET INTERVAL is not legal on this table
ORA-14760: ADD PARTITION is not permitted on Interval partitioned objects
ORA-14761: MAXVALUE partition cannot be specified for Interval partitioned objects
ORA-14767: Cannot specify this interval with existing high bounds
ORA-16000: standby tenant is read only
ORA-19010: Cannot insert XML fragments
ORA-19012: Cannot convert XML fragment to the required datatype
ORA-19025: EXTRACTVALUE cannot extract values of multiple nodes
ORA-19026: EXTRACTVALUE can only retrieve value of leaf nodetoo small.
ORA-19044: character length specified for XMLSerialize is too small.
ORA-19208: parameter %d of function XMLELEMENT must be aliased