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Start on Cloud

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

DEPLOY YOUR WAY

OceanBase Cloud

The best way to deploy and scale OceanBase

OceanBase Enterprise

Run and manage OceanBase on your infra

TRY OPEN SOURCE

OceanBase Community Edition

The free, open-source distributed database

OceanBase seekdb

Open source AI native search database

Customer Stories

Real-world success stories from enterprises across diverse industries.

View All
BY USE CASES

Mission-Critical Transactions

Global & Multicloud Application

Elastic Scaling for Peak Traffic

Real-time Analytics

Active Geo-redundancy

Database Consolidation

Comprehensive knowledge hub for OceanBase.

Blog

Live Demos

Training & Certification

Documentation

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

View All
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QUICK START
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OceanBase Database

SQL - V3.2.4Enterprise Edition

  • Documentation Revision History
  • Document Overview
  • Get Started
    • What is OceanBase Database
      • Overview
      • Concepts
      • Compatibility with Oracle
        • Overview
        • SQL data types
        • Built-in functions
        • System views
      • Compatibility with MySQL
      • Management tools
      • Version rules
      • Limitations
    • Deploy OceanBase Database
      • Deployment introduction
      • Deployment process
      • Preparations
        • Prepare servers
        • Server configurations
        • Prepare installation packages
      • HA solution for OceanBase clusters
      • Deploy through the GUI
        • Configure the deployment environment
          • Deploy OAT
          • Verify deployment
          • Configure the clock source
          • Upload installation packages
          • Add a server
          • Initialize a server
        • Deploy OCP
          • Overview
          • Add an OCP configuration file
          • Deploy OCP
          • Verify deployment
        • Deploy the OceanBase cluster
          • (Optional) Configure DNS
          • Add an OBServer to the OCP resource pool
          • Create an OceanBase cluster
        • Deploy ODP
          • Overview
          • Deploy ODP
        • Create an OceanBase tenant
          • View resources available for a business tenant
          • Create a tenant
          • Verify deployment
        • Deploy OMS
          • Overview
          • Add an OMS configuration file
          • Deploy OMS
          • Verify deployment
        • Deploy ODC
          • Overview
          • Add an ODC configuration file
          • Deploy ODC
          • Verify deployment
      • Deploy through the CLI
        • Configure the deployment environment
          • Install oat-cli
          • Use oat-cli to configure the deployment environment
          • Configure the clock source
          • Upload installation packages
          • Configure host information
          • Check the environment before deployment
        • Deploy OCP
          • Overview
          • Generate a configuration file
          • Start deployment
          • Verify deployment
        • Deploy the OceanBase cluster
          • Deploy a single-replica OceanBase cluster
          • Deploy a three-replica OceanBase cluster
        • Deploy ODP
          • Deploy ODP by using the CLI
        • Create an OceanBase tenant
          • View resources available for a business tenant
          • Create a tenant
          • Verify deployment
        • Deploy OMS
          • Overview
          • Modify the configuration file
          • Start deployment
          • Verify deployment
        • Deploy ODC
          • Overview
          • Modify the configuration file
          • Start deployment
          • Verify deployment
    • Data migration
      • Overview
      • Migrate data by using OMS
        • Migrate data by using OMS
        • Migrate data from a MySQL database to a MySQL tenant of OceanBase Database by using OMS
        • Migrate data from a MySQL tenant of OceanBase Database to a MySQL database by using OMS
        • Migrate data from an Oracle database to a MySQL tenant of OceanBase Database by using OMS
        • Migrate data from an Oracle database to an Oracle tenant of OceanBase Database by using OMS
        • Migrate data from an Oracle tenant of OceanBase Database to an Oracle database by using OMS
        • Migrate data from a DB2 LUW database to a MySQL tenant of OceanBase Database by using OMS
        • Migrate data from a DB2 LUW database to an Oracle tenant of OceanBase Database by using OMS
        • Migrate data from a MySQL tenant of OceanBase Database to a DB2 LUW database by using OMS
        • Migrate data from an Oracle tenant of OceanBase Database to a DB2 LUW database by using OMS
        • Migrate data from a TiDB database to a MySQL tenant of OceanBase Database by using OMS
        • Migrate data between MySQL tenants of OceanBase Database by using OMS
        • Use OMS to migrate data between Oracle tenants of OceanBase Database
      • Migrate data by using OBLOADER & OBDUMPER
        • Import data by using OBLOADER
        • Export data by using OBDUMPER
      • Migrate data by using SQL scripts
      • Migrate data by using mysqldump
      • Migrate data by using DataX
      • Migrate data by using the OUTFILE statement
    • Database connections and routing
      • Overview
      • Manage ODP
        • ODP management 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 an ODP
        • ODP startup parameters
      • Database connections
        • Connect to OceanBase Database from OBClient
        • Connect to OceanBase Database from a MySQL client
        • Connect to OceanBase Database through ODC
      • Physical connections
      • Logical connections
        • Query all sessions
        • Query the details of a session
        • Query the metrics of a session
        • Query session variables
        • Terminate a session
      • Driver management
        • Overview
        • OB-ODBC
        • OBCI
        • OceanBase Connector/C
        • OceanBase Connector/J
      • Routing management
        • Table-based routing of ODP
        • SQL parser
        • LDC-based routing
        • ODP routing strategies
          • Read/Write splitting
          • Follower-first read
          • Blocklist mechanism
    • Cluster and multi-tenant management
      • Manage clusters
        • Create a cluster
        • Manage clusters
        • Manage cluster parameters
          • Overview
          • Query cluster-level parameters
          • Modify cluster-level parameters
        • Manage zones in a cluster
          • Overview of zone management
          • Add or delete a zone
          • Add or delete an encrypted zone
          • Start or stop a zone
          • Modify the configurations of a zone
          • Restart a zone
          • Isolate a failed zone
        • Manage OBServer nodes
          • Add an OBServer node
          • View OBServer node status
          • Stop or start an OBServer node
          • Restart an OBServer node
          • Isolate a failed OBServer node
          • Delete an OBServer node
          • Replace an OBServer node
        • View cluster information
        • Overview of cluster tenant management
        • Monitor cluster performance
        • Cluster performance report
        • View resource information of a cluster
      • Configuration management
        • Overview of configuration management
        • Set parameters
        • Set variables
        • Configure general parameters
        • Examples of parameter configuration in a production environment
        • Recommended minimum resource configuration
      • Resource management
        • Overview
        • Create a resource unit
        • Manage resource units
          • View configurations of a resource unit
          • Modify configurations of a resource unit
          • Drop a resource unit
        • Create a resource pool
        • Manage resource pools
          • Allocate a resource pool to a tenant
          • Modify a resource pool
          • Merge resource pools
          • Split a resource pool
          • Remove a resource pool from a tenant
          • Delete a resource pool
        • Query resource allocation
      • Tenant management
        • Overview of tenant management
        • Create a tenant
        • Copy a tenant
        • Manage tenants
          • Query tenant information
          • Modify a tenant
          • Rename a tenant
          • Drop a tenant
        • Manage users and privileges
          • Users and privileges
            • Overview
            • sys tenant
            • Oracle tenants
            • MySQL tenants
          • Oracle mode
            • Create a user
            • Set password complexity
            • Logon failure handling policies
            • View user privileges
            • Modify user privileges
            • Change the password of a user
            • Lock or unlock a user
            • Drop a user
            • Manage roles
              • Overview
              • Create a role
              • Assign a role to another role
              • Assign a role to a user
              • Specify valid or invalid roles for a user
              • View roles
              • Modify a role
              • Revoke a role
              • Drop a role
          • MySQL mode
            • Create a user
            • Set password complexity
            • Handle logon failures
            • View user privileges
            • Modify user privileges
            • Change the password of a user
            • Lock and unlock a user
            • Drop a user
        • Set and view the tenant allowlist
        • View the topology of a tenant
        • View the resource configurations of a tenant
        • Modify the resource configurations of a tenant
        • View the performance metrics of a tenant
        • View tenant sessions
        • Terminate a tenant session
        • Manage tenant parameters
          • Overview
          • Query tenant-level parameters
          • Modify tenant-level parameters
        • Manage tenant variables
      • Manage data storage
        • 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
          • Manually initiate a major compaction
          • Manually control a major compaction
          • View major compaction information
            • View the major compaction process
            • View disk usage during a major compaction
          • Major compaction timeouts and errors
          • Modify major compaction settings
        • Data compression
          • Overview
          • Data encoding and compression
      • Manage memory
        • 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
        • Query memory usage information
        • FAQ
      • Manage processes
        • Overview
        • Multi-tenant threads of OceanBase Database
        • FAQ about multi-tenant threads
        • Background threads of OceanBase Database
      • Manage logs
        • Log overview
        • Log generation levels
          • Log generation levels
          • Set a log generation level
        • Log file size and quantity management
          • Use the log file splitting feature
          • Control the number of log files
        • Query logs
          • Query the log of an SQL request
          • Query the log of a previous SQL request by using the SQL Trace feature
    • Database object management
      • Oracle mode
        • Manage tables
          • Overview
          • Create a table
          • Define column constraints
          • Query table definition
          • Modify a table
          • Empty a table
          • Drop a table
        • Manage table groups
          • Overview
          • Statements for table group management
        • Manage indexes
          • Overview
          • Create indexes
          • Query indexes
          • Drop an index
        • Manage views
        • Manage sequences
        • Manage synonyms
        • Manage triggers
          • Overview
          • Create a DML trigger
          • Create an INSTEAD OF trigger
          • Modify and drop a trigger
          • Disable or enable a trigger
          • Query trigger information
        • Manage directory objects
        • Manage DBLinks
      • MySQL mode
        • Manage databases
          • Create a database
          • View databases
          • Modify a database
          • Drop a database
        • Manage tables
          • Overview
          • Create a table
          • Define an auto-increment column
          • Define column constraints
          • Query table definition
          • Modify a table
          • Empty a table
          • Drop a table
        • Manage table groups
          • Overview
          • Statements for table group management
        • Manage indexes
          • Overview
          • Create indexes
          • Query indexes
          • Drop an index
        • Manage views
        • Manage sequences
        • Manage triggers
          • Overview
          • Create a DML trigger
          • Query trigger information
          • Drop a trigger
    • Distributed storage management
      • Overview of data distribution
      • Manage partitions
        • Oracle mode
          • Overview of partitions
          • Create a partitioned table
          • Manage a partitioned table
          • Create a subpartitioned table
          • Manage a subpartitioned table
          • Partition pruning
          • Query data in specified partitions
          • Create an index for a partitioned table
            • Overview of indexes
            • Local indexes
            • Global indexes
          • Create a partitioned table group
          • Add a partitioned table to a table group
          • Manage a partitioned table group
          • Create a subpartitioned table group
          • Add a subpartitioned table to a table group
          • Manage a subpartitioned table group
        • MySQL mode
          • Overview of partitions
          • Create a partitioned table
          • Manage a partitioned table
          • Create a subpartitioned table
          • Manage a subpartitioned table
          • Partition pruning
          • Query data in specified partitions
          • Create an index for a partitioned table
            • Overview of indexes
            • Local indexes
            • Global indexes
          • Create a partitioned table group
          • Add a partitioned table to a table group
          • Manage a partitioned table group
          • Create a subpartitioned table group
          • Add a subpartitioned table to a table group
          • Manage a subpartitioned table group
      • Manage replicas
        • Overview
        • Create a replica
        • Edit a tenant replica in a zone
        • Delete a tenant replica from a zone
      • Manage locality
        • Overview
        • Modify table locality
        • Modify tenant locality
      • Load balancing
        • Overview of load balancing
        • Manage automatic load balancing
        • Manually manage load balancing
          • Manually migrate and switch partition replicas
          • Set load balancing by using table groups
          • Set load balancing by primary zone
    • Performance tuning
      • Overview
      • Performance tools
        • System tools
          • General tool Top
          • CPU tools
          • Memory tools
          • Disk I/O tools
          • Network tools
        • Internal tables
          • gv$sysstat
          • gv$sql_audit
          • __all_virtual_trans_stat
        • Logs
          • slow trans
          • tenant dump
          • Slow queries
        • OCP
          • Monitoring and alerts
          • SQL diagnostics
          • Performance report
          • ASH report
          • Transaction diagnostics
          • Deadlock detection
      • System tuning
        • OS parameter tuning
        • Database parameter tuning
          • CPU parameters
          • I/O parameters
          • Memory-related parameters
          • Network transmission parameters
        • ODP parameter tuning
          • CPU parameters
          • Network transmission parameters
          • Route parameters on nodes
      • Business model tuning
        • Load balancing
        • SQL diagnostics
        • Distributed transactions
      • SQL tuning guide
        • Execution process of SQL queries
        • SQL execution plan
          • Introduction to SQL execution plans
          • Execution plan operators
            • TABLE SCAN
            • TABLE LOOKUP
            • 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
        • Distributed execution plan
          • Perform distributed execution and parallel queries
          • Generate a distributed plan
          • Schedule distributed execution plans
          • Manage distributed execution plans
          • Execute parallel queries
          • Perform parameter tuning for a parallel query
          • Parallel DML
        • SQL tuning
          • Overview
          • General procedure of SQL tuning
          • Monitor the SQL execution performance
            • gv$sql_audit
            • SQL Trace
            • Plan cache views
            • Examples of SQL performance analysis
              • 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 specified period
              • Analyze queries related to distributed plans
              • Check whether the RPC execution count of a distributed subplan is balanced across servers in a cluster
          • Optimizer statistics
            • Overview of statistics
            • Statistics collection methods
              • Overview
              • Histograms
              • Manual statistics collection
              • Automatic statistics collection
            • Statistics management
              • Overview
              • Deletion
              • Setting
              • Import and export
              • Locking and unlocking
              • History management
              • Statistics preference management
            • 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 algorithms
              • Overview
              • Join algorithms
              • Join order
          • Manage execution plans
            • Optimizer hints
            • Plan binding
            • SQL plan management
        • Glossary
        • General issues in SQL tuning
      • Performance diagnostics
        • Monitor and diagnose the cluster performance
        • Tenant performance diagnostics
        • Monitor ODP performance
        • Monitor host performance
      • Case analysis
      • Performance test (MySQL mode)
        • Sysbench OLTP
        • BenchMarkSQL
        • TPC-H
      • Performance test (Oracle mode)
        • BenchMarkSQL
        • TPC-H
    • Data high availability
      • Flashback
        • Objects supported by the recycle bin
        • Recycle bin for databases, tables, and indexes
        • Recycle bin for tenants
        • Flash back objects from the recycle bin
        • Restore point
        • Use a flashback query to query data of multiple versions
      • Manage physical backup and restore
        • Introduction to physical backup and restore
        • Deploy NFS
        • Data backup for a cluster
          • Perform a backup by using commands
            • Preparations for backup
            • Initiate a log backup
            • Initiate a data backup
          • Perform a backup for a cluster in OCP
          • Backup of a specified path for a tenant
          • Enable backup for clusters based on log splitting
          • Check the backup progress
          • Stop a backup
          • Automatically clear backup data for clusters
          • Manually clear backup data for clusters
          • Stop backup data clearing for clusters
        • Back up data backups
          • Overview
          • Perform a secondary backup for a cluster by using commands
            • Preparations for secondary backup
            • Initiate a secondary log backup
            • Initiate a secondary data backup
          • Perform a secondary backup for clusters in OCP
          • Perform a secondary backup for tenants
          • View the progress of secondary data backup tasks
          • Stop a secondary backup
          • Automatically clear secondary backup data for clusters
          • Manually clear secondary backup data
          • Stop clearing secondary backup data
        • Update access_id and access_key for OSS in the backup destination during backup
        • Verify data
          • Overview
          • Verify backup data in a cluster
          • Verify backup data in a specified path in a cluster
          • Verify backup data in a specified path across clusters
          • View data verification results
        • Restore data
          • Preparations for restore
          • Perform full restore
          • Restore a specified table
          • Restore secondary backup data
          • View the restore progress and results
          • Cancel restore
        • Routine maintenance
          • Query backup parameters
          • Force stop all backup-related tasks
          • Set backup_zone
      • Primary/Standby cluster management
        • Overview
        • Considerations and limitations
        • Deploy the primary and standby clusters
          • Configuration requirements
          • Deploy a primary cluster
          • Check the configurations of the primary cluster
          • Deploy standby clusters in OCP
        • Tenant management
        • Log transfer service
          • Overview
          • Set the log transfer parameter for a standby cluster
          • Configure log compression
        • Protection mode
          • Overview
          • Protection modes and protection levels
          • Switch to another protection mode
        • Role switching
          • Preparations for a switchover
          • Perform a switchover in a command-line tool
          • Perform a switchover in OCP
          • Perform a failover in a command-line tool
            • Preparations for a failover
            • Perform a lossless failover
            • Connect the original primary cluster after a lossless failover
            • Connect other standby clusters after a lossless failover
            • Perform a lossy failover
            • Restore other clusters after a lossy failover
            • Correct the data after a failover
          • Perform a failover in OCP
        • Standby cluster read service
        • Delete a standby cluster
        • Standby cluster disconnection
          • Preparations for disconnection
          • Disconnect a standby cluster
        • Troubleshooting
          • Failover errors
          • Switchover errors
          • Protection mode switching errors
          • Tenant creation for a standby cluster got stuck
          • Data synchronization enablement errors
          • Standby cluster disconnection errors
    • Database security
      • Data storage encryption
        • Overview
        • MySQL mode
          • Enable storage encryption for a new table
          • Enable storage encryption for an existing table
          • Decrypt a table
        • Oracle mode
          • Enable storage encryption for a new table
          • Enable storage encryption for an existing table
          • Decrypt a table
      • Data transmission encryption
        • Overview
        • Transmission encryption of OBServer nodes
        • Transmission encryption of ODPs
      • RPC connection authentication
      • Set row-level access control
      • Audit databases
        • Overview
        • Enable audit
        • Audit user logon operations
        • Audit user operations
        • Audit specified database objects
    • O&M management
      • O&M overview
        • Overview
        • Monitoring
          • View status monitoring information
          • View performance monitoring information
          • Perform SQL diagnostics
        • Alerts
          • Alert configuration
          • Manage alert subscriptions
          • Perform alert management
          • Manage alert items
      • Database upgrade
        • Overview
        • Perform an upgrade
        • Perform a major compaction
        • Check upgrade results
      • Scale-in and scale-out
        • Overview
        • Cluster-level scale-in and scale-out
          • Scale-out
            • Add zones to a cluster
            • Add OBServer nodes to zones
          • Scale-in
            • Delete zones from a cluster
            • Delete OBServer nodes from zones
        • Scale-in and scale-out of tenant resources
          • Modify unit_config
          • Modify UNIT_NUM
      • Resource isolation
        • cgroup-based resource isolation
          • Enable cgroups-based CPU isolation between tenant worker threads
          • Clear cgroup configurations
      • Routine inspections
        • Overview
        • Check the cluster status
        • Check cluster parameters
        • Check the host status
        • Check tenant resource usage
        • Check cluster resource usage
        • Check the OBServer node status
        • Check the NTP offset
        • Check data backup
        • Check the ODP connection status
      • Troubleshooting
        • Overview
        • Issue analysis
          • View alerts
          • View logs
          • View error codes
          • Query views
        • Troubleshoot OBServer node restart failures
        • Troubleshoot unexpected exit of an observer process
        • Troubleshoot bootstrap failures
        • Troubleshoot database connection issues
        • Troubleshoot clock synchronization issues
        • Troubleshoot the absence of a leader
        • Troubleshoot replica migration issues
        • Troubleshoot exhausted tenant MemStore memory
        • Tenant memory overrun
        • Troubleshoot major compaction exceptions
        • Overloaded OBServer nodes
        • Troubleshoot row lock contention
        • Troubleshoot transaction errors
      • Emergency response
        • Overview
        • Analysis, diagnosis, and decision-making process
        • Common emergency response
          • Exceptions caused by hardware
            • Node failures
            • Network jitter
            • ODP faults
            • Other exceptions related to hardware and network
          • Exceptions caused by capacity changes
            • Exceptions of SQL queries
            • High disk I/O on an OBServer node
            • Overloaded NIC on an OBServer node
            • Full occupation of tenant memory
            • Full usage of ODP threads
            • Full usage of OBServer clog disk
            • Full usage of the OBServer data disk
            • Accumulated request queue of a tenant
          • Other cluster exceptions
            • Blocked tenant minor compaction
            • Blocked cluster major compaction
            • sys tenant or RootService exceptions
            • Insufficiency or leakage of system memory
            • Slow query of the queuing table
    • System references
      • System parameters
        • Overview
        • Summary of system parameters
        • Cluster-level parameters
          • all_cluster_list
          • auto_broadcast_location_cache_rate_limit
          • auto_delete_expired_backup
          • auto_leader_switch_interval
          • auto_refresh_location_cache_rate_limit
          • autoinc_cache_refresh_interval
          • backup_backup_archive_log_batch_count
          • backup_backup_archivelog_retry_interval
          • backup_backup_dest
          • backup_backupset_batch_count
          • backup_backup_dest_option
          • backup_backupset_retry_interval
          • backup_concurrency
          • backup_dest
          • backup_dest_option
          • backup_log_archive_option
          • backup_net_limit
          • backup_recovery_window
          • backup_region
          • backup_zone
          • balance_blacklist_failure_threshold
          • balance_blacklist_retry_interval
          • balancer_emergency_percentage
          • balancer_idle_time
          • balancer_log_interval
          • balancer_task_timeout
          • balancer_timeout_check_interval
          • balancer_tolerance_percentage
          • bf_cache_miss_count_threshold
          • bf_cache_priority
          • builtin_db_data_verify_cycle
          • cache_wash_threshold
          • clog_cache_priority
          • clog_disk_usage_limit_percentage
          • clog_disk_utilization_threshold
          • clog_expire_days
          • clog_sync_time_warn_threshold
          • clog_transport_compress_all
          • clog_transport_compress_func
          • cluster
          • cluster_id
          • config_additional_dir
          • cpu_count
          • cpu_quota_concurrency
          • cpu_reserved
          • data_copy_concurrency
          • data_dir
          • data_disk_usage_limit_percentage
          • data_storage_error_tolerance_time
          • data_storage_warning_tolerance_time
          • datafile_disk_percentage
          • datafile_size
          • dead_socket_detection_timeout
          • debug_sync_timeout
          • default_compress
          • default_compress_func
          • default_row_format
          • default_transport_compress_func
          • devname
          • disk_io_thread_count
          • dtl_buffer_size
          • election_blacklist_interval
          • election_cpu_quota
          • enable_async_syslog
          • enable_auto_leader_switch
          • enable_auto_refresh_location_cache
          • enable_ddl
          • enable_election_group
          • enable_global_freeze_trigger
          • enable_log_archive
          • enable_major_freeze
          • enable_manual_merge
          • enable_merge_by_turn
          • enable_ob_ratelimit
          • enable_one_phase_commit
          • enable_perf_event
          • enable_pg
          • enable_rebalance
          • enable_record_trace_id
          • enable_record_trace_log
          • enable_rereplication
          • enable_rich_error_msg
          • enable_rootservice_standalone
          • enable_separate_sys_clog
          • enable_smooth_leader_switch
          • enable_sql_audit
          • enable_sql_operator_dump
          • enable_sys_unit_standalone
          • enable_syslog_recycle
          • enable_syslog_wf
          • enable_tcp_keepalive
          • enable_unit_balance_resource_weight
          • enable_upgrade_mode
          • fast_recovery_concurrency
          • flush_log_at_trx_commit
          • force_refresh_location_cache_interval
          • force_refresh_location_cache_threshold
          • freeze_trigger_percentage
          • fuse_row_cache_priority
          • gc_wait_archive
          • get_leader_candidate_rpc_timeout
          • global_index_build_single_replica_timeout
          • global_major_freeze_residual_memory
          • global_write_halt_residual_memory
          • high_priority_net_thread_count
          • ignore_replay_checksum_error
          • ignore_replica_checksum_error
          • ilog_index_expire_time
          • index_cache_priority
          • index_clog_cache_priority
          • index_info_block_cache_priority
          • internal_sql_execute_timeout
          • large_query_threshold
          • large_query_worker_percentage
          • leak_mod_to_check
          • lease_time
          • location_cache_cpu_quota
          • location_cache_expire_time
          • location_cache_priority
          • 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
          • log_archive_concurrency
          • log_restore_concurrency
          • major_compact_trigger
          • major_freeze_duty_time
          • 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_check_interval
          • 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_compact_trigger
          • minor_deferred_gc_time
          • minor_freeze_times
          • minor_merge_concurrency
          • minor_warm_up_duration_time
          • multiblock_read_gap_size
          • multiblock_read_size
          • mysql_port
          • net_thread_count
          • ob_event_history_recycle_interval
          • ob_ratelimit_stat_period
          • obconfig_url
          • ofs_list
          • partition_table_check_interval
          • partition_table_scan_batch_count
          • plan_cache_evict_interval
          • plan_cache_high_watermark
          • plan_cache_low_watermark
          • px_task_size
          • px_workers_per_cpu_quota
          • rebuild_replica_data_lag_threshold
          • recyclebin_object_expire_time
          • replica_safe_remove_time
          • resource_hard_limit
          • resource_soft_limit
          • restore_concurrency
          • rootservice_async_task_queue_size
          • rootservice_async_task_thread_count
          • rootservice_list
          • rootservice_memory_limit
          • rootservice_ready_check_interval
          • row_compaction_update_limit
          • row_purge_thread_count
          • 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_data_copy_in_concurrency
          • server_data_copy_out_concurrency
          • server_permanent_offline_time
          • server_temporary_offline_time
          • sql_audit_memory_limit
          • sql_audit_queue_size
          • ssl_client_authentication
          • ssl_external_kms_info
          • stack_size
          • switchover_process_thread_count
          • sys_bkgd_io_high_percentage
          • sys_bkgd_io_low_percentage
          • sys_bkgd_migration_change_member_list_timeout
          • sys_bkgd_migration_retry_num
          • sys_bkgd_net_percentage
          • sys_cpu_limit_trigger
          • syslog_io_bandwidth_limit
          • syslog_level
          • system_cpu_quota
          • system_memory
          • system_trace_level
          • tableapi_transport_compress_func
          • tablet_size
          • tcp_keepcnt
          • tcp_keepidle
          • tcp_keepintvl
          • tenant_cpu_variation_per_server
          • tenant_groups
          • tenant_task_queue_size
          • token_reserved_percentage
          • trace_log_sampling_interval
          • trace_log_slow_query_watermark
          • trx_2pc_retry_interval
          • trx_force_kill_threshold
          • trx_try_wait_lock_timeout
          • unit_balance_resource_weight
          • use_large_pages
          • user_block_cache_priority
          • user_iort_up_percentage
          • user_row_cache_priority
          • user_tab_col_stat_cache_priority
          • virtual_table_location_cache_expire_time
          • wait_leader_batch_count
          • weak_read_version_refresh_interval
          • workers_per_cpu_quota
          • zone
          • zone_merge_concurrency
          • zone_merge_order
          • zone_merge_timeout
          • ob_esi_rpc_port
          • enable_ob_esi_process
          • ob_esi_session_timeout
          • ob_esi_io_concurrency
          • ob_esi_memory_limit
          • ob_esi_syslog_level
          • ob_esi_max_syslog_file_count
          • sql_login_thread_count
          • diag_syslog_per_error_limit
          • enable_cgroup
          • rpc_client_authentication_method
          • rpc_server_authentication_method
          • max_trx_part_size
        • 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
          • default_progressive_merge_num
          • enable_clog_persistence_compress
          • enable_early_lock_release
          • enable_monotonic_weak_read
          • external_kms_info
          • enable_sql_extension
          • job_queue_processes
          • max_stale_time_for_weak_consistency
          • ob_enable_batched_multi_statement
          • ob_proxy_readonly_transaction_routing_policy
          • ob_ssl_invited_common_names
          • open_cursors
          • plsql_ccflags
          • plsql_code_type
          • plsql_debug
          • plsql_optimize_level
          • plsql_v2_compatibility
          • plsql_warnings
          • sql_work_area
          • tde_method
          • writing_throttling_maximum_duration
          • writing_throttling_trigger_percentage
          • workarea_size_policy
          • ob_query_switch_leader_retry_timeout
      • System variables (MySQL mode)
        • Overview
        • System variable summary
        • 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
        • 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
        • interactive_timeout
        • is_result_accurate
        • last_insert_id
        • license
        • lower_case_table_names
        • max_allowed_packet
        • 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_language
        • 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_capability_flag
        • ob_compatibility_mode
        • ob_create_table_strict_mode
        • ob_default_replica_num
        • ob_early_lock_release
        • ob_enable_aggregation_pushdown
        • ob_enable_blk_nestedloop_join
        • ob_enable_hash_group_by
        • ob_enable_index_direct_select
        • ob_enable_jit
        • ob_enable_plan_cache
        • ob_enable_sql_audit
        • ob_enable_trace_log
        • ob_enable_transformation
        • ob_enable_transmission_checksum
        • ob_enable_truncate_flashback
        • ob_global_debug_sync
        • ob_last_schema_version
        • ob_log_level
        • ob_max_parallel_degree
        • ob_org_cluster_id
        • 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_proxy_partition_hit
        • ob_proxy_set_trx_executed
        • ob_query_timeout
        • ob_read_consistency
        • ob_reserved_meta_memory_percentage
        • ob_route_policy
        • ob_safe_weak_read_snapshot
        • ob_sql_audit_percentage
        • ob_sql_work_area_percentage
        • ob_stmt_parallel_degree
        • ob_tcp_invited_nodes
        • ob_temp_tablespace_size_percentage
        • ob_timestamp_service
        • ob_trace_info
        • 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
        • timestamp
        • tracefile_identifier
        • transaction_isolation
        • transaction_read_only
        • tx_isolation
        • tx_read_only
        • undo_retention
        • 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
        • binlog_format
        • binlog_checksum
        • binlog_rows_query_log_events
        • log_bin
        • server_id
        • default_storage_engine
        • max_connections
        • event_scheduler
        • cte_max_recursion_depth
        • regexp_stack_limit
        • regexp_time_limit
      • System variables (Oracle mode)
        • Overview
        • System variable summary
        • 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
        • 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
        • interactive_timeout
        • is_result_accurate
        • last_insert_id
        • license
        • lower_case_table_names
        • max_allowed_packet
        • 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_language
        • 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_capability_flag
        • ob_compatibility_mode
        • ob_create_table_strict_mode
        • ob_default_replica_num
        • ob_early_lock_release
        • ob_enable_aggregation_pushdown
        • ob_enable_blk_nestedloop_join
        • ob_enable_hash_group_by
        • ob_enable_index_direct_select
        • ob_enable_jit
        • ob_enable_plan_cache
        • ob_enable_sql_audit
        • ob_enable_trace_log
        • ob_enable_transformation
        • ob_enable_transmission_checksum
        • ob_enable_truncate_flashback
        • ob_global_debug_sync
        • ob_last_schema_version
        • ob_log_level
        • ob_max_parallel_degree
        • ob_org_cluster_id
        • 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_proxy_partition_hit
        • ob_proxy_set_trx_executed
        • ob_query_timeout
        • ob_read_consistency
        • ob_reserved_meta_memory_percentage
        • ob_route_policy
        • ob_safe_weak_read_snapshot
        • ob_sql_audit_percentage
        • ob_sql_work_area_percentage
        • ob_stmt_parallel_degree
        • ob_tcp_invited_nodes
        • ob_temp_tablespace_size_percentage
        • ob_timestamp_service
        • ob_trace_info
        • 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_quote_show_create
        • sql_select_limit
        • sql_throttle_current_priority
        • sql_throttle_network
        • sql_throttle_priority
        • sql_throttle_rt
        • sql_warnings
        • system_time_zone
        • sql_safe_updates
        • time_zone
        • timestamp
        • tracefile_identifier
        • transaction_isolation
        • transaction_read_only
        • tx_isolation
        • tx_read_only
        • undo_retention
        • 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
        • event_scheduler
      • System views (MySQL mode)
        • Overview
        • Dictionary views
          • Overview
          • mysql.help_topic
          • mysql.help_category
          • mysql.help_keyword
          • mysql.help_relation
          • mysql.db
          • mysql.proc
          • mysql.time_zone
          • mysql.time_zone_name
          • mysql.time_zone_transition
          • mysql.time_zone_transition_type
          • mysql.user
          • information_schema.CHARACTER_SETS
          • information_schema.CHECK_CONSTRAINTS
          • information_schema.COLLATIONS
          • information_schema.COLLATION_CHARACTER_SET_APPLICABILITY
          • information_schema.COLUMNS
          • information_schema.DBA_OUTLINES
          • 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.SCHEMATA
          • information_schema.SCHEMA_PRIVILEGES
          • 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.USER_RECYCLEBIN
          • information_schema.VIEWS
          • information_schema.CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS
          • oceanbase.CDB_OB_BACKUP_ARCHIVELOG_SUMMARY
          • oceanbase.CDB_OB_BACKUP_JOB_DETAILS
          • oceanbase.CDB_OB_BACKUP_SET_DETAILS
          • oceanbase.CDB_OB_BACKUP_PROGRESS
          • oceanbase.CDB_OB_BACKUP_SET_EXPIRED
          • oceanbase.CDB_OB_BACKUP_ARCHIVELOG_PROGRESS
          • oceanbase.CDB_OB_BACKUP_CLEAN_HISTORY
          • oceanbase.CDB_OB_BACKUP_TASK_CLEAN_HISTORY
          • oceanbase.CDB_OB_RESTORE_PROGRESS
          • oceanbase.CDB_OB_RESTORE_HISTORY
          • oceanbase.CDB_CKPT_HISTORY
          • oceanbase.CDB_OB_BACKUP_VALIDATION_JOB
          • oceanbase.CDB_OB_BACKUP_VALIDATION_JOB_HISTORY
          • oceanbase.CDB_OB_TENANT_BACKUP_VALIDATION_TASK
          • oceanbase.CDB_OB_BACKUP_VALIDATION_TASK_HISTORY
          • oceanbase.CDB_OB_BACKUP_BACKUP_ARCHIVELOG_SUMMARY
          • oceanbase.CDB_OB_BACKUP_BACKUPSET_TASK_HISTORY
          • oceanbase.CDB_OB_BACKUP_BACKUPSET_TASK
          • oceanbase.CDB_OB_BACKUP_BACKUPSET_JOB_HISTORY
          • oceanbase.CDB_OB_BACKUP_BACKUPSET_JOB
          • oceanbase.CDB_OB_BACKUP_SET_OBSOLETE
          • oceanbase.CDB_OB_BACKUP_ARCHIVELOG
          • oceanbase.CDB_OB_BACKUP_BACKUP_ARCHIVELOG
          • oceanbase.CDB_OB_BACKUP_BACKUPPIECE_JOB
          • oceanbase.CDB_OB_BACKUP_BACKUPPIECE_JOB_HISTORY
          • oceanbase.CDB_OB_BACKUP_BACKUPPIECE_TASK
          • oceanbase.CDB_OB_BACKUP_BACKUPPIECE_TASK_HISTORY
          • oceanbase.CDB_OB_BACKUP_PIECE_FILES
          • oceanbase.CDB_OB_BACKUP_SET_FILES
          • information_schema.ST_GEOMETRY_COLUMNS
          • information_schema.ST_SPATIAL_REFERENCE_SYSTEMS
          • oceanbase.DBA_RSRC_PLANS
          • oceanbase.DBA_RSRC_PLAN_DIRECTIVES
          • oceanbase.DBA_RSRC_GROUP_MAPPINGS
          • oceanbase.DBA_RSRC_CONSUMER_GROUPS
        • Performance views
          • Overview
          • gv$plan_cache_stat
          • gv$plan_cache_plan_stat
          • gv$session_event
          • gv$session_wait
          • gv$session_wait_history
          • gv$system_event
          • gv$sesstat
          • gv$sysstat
          • gv$sql_audit
          • gv$latch
          • gv$memory
          • gv$memstore
          • gv$memstore_info
          • gv$plan_cache_plan_explain
          • gv$obrpc_outgoing
          • gv$obrpc_incoming
          • gv$sql
          • gv$sql_plan_monitor
          • gv$outline
          • gv$concurrent_limit_sql
          • gv$sql_plan_statistics
          • gv$server_memstore
          • gv$unit_load_balance_event_history
          • gv$tenant
          • gv$database
          • gv$table
          • gv$unit
          • gv$partition
          • gv$lock_wait_stat
          • gv$session_longops
          • gv$tenant_memstore_allocator_info
          • gv$minor_merge_info
          • gv$tenant_px_worker_stat
          • gv$partition_audit
          • gv$ps_stat
          • gv$ps_item_info
          • gv$sql_workarea
          • gv$sql_workarea_histogram
          • gv$ob_sql_workarea_memory_info
          • gv$server_schema_info
          • gv$merge_info
          • gv$lock
          • gv$sstable
          • gv$ob_trans_table_status
          • gv$tenant_memory_info
          • v$statname
          • v$event_name
          • v$session_event
          • v$session_wait
          • v$session_wait_history
          • v$sesstat
          • v$sysstat
          • v$system_event
          • v$memory
          • v$memstore
          • v$memstore_info
          • v$plan_cache_stat
          • v$plan_cache_plan_stat
          • v$plan_cache_plan_explain
          • v$sql_audit
          • v$obrpc_outgoing
          • v$obrpc_incoming
          • v$sql
          • v$sql_plan_monitor
          • v$sql_plan_statistics
          • v$unit
          • v$partition
          • v$lock_wait_stat
          • v$session_longops
          • v$latch
          • v$tenant_memstore_allocator_info
          • v$tenant_px_worker_stat
          • v$partition_audit
          • v$ob_cluster
          • v$ob_standby_status
          • v$ob_cluster_stats
          • v$ob_cluster_event_history
          • v$ps_stat
          • v$ps_item_info
          • v$sql_workarea
          • v$sql_workarea_active
          • v$sql_workarea_histogram
          • v$ob_sql_workarea_memory_info
          • v$ob_timestamp_service
          • v$server_schema_info
          • v$merge_info
          • v$lock
          • v$sql_monitor_statname
          • v$restore_point
          • v$ob_cluster_failover_info
          • v$encrypted_tables
          • v$encrypted_tablespaces
          • v$sstable
          • v$ob_trans_table_status
          • v$ob_all_clusters
          • v$tenant_memory_info
          • GV$OB_DTL_INTERM_RESULT_MONITOR
          • V$OB_DTL_INTERM_RESULT_MONITOR
          • V$RSRC_PLAN
      • System views (Oracle mode)
        • Overview
        • Dictionary views
          • Overview
          • ALL_ALL_TABLES
          • ALL_ARGUMENTS
          • ALL_COL_COMMENTS
          • ALL_COLL_TYPES
          • ALL_COL_PRIVS
          • ALL_CONSTRAINTS
          • ALL_CONS_COLUMNS
          • ALL_DEF_AUDIT_OPTS
          • ALL_DEPENDENCIES
          • ALL_DIRECTORIES
          • ALL_ERRORS
          • ALL_INDEXES
          • ALL_IND_COLUMNS
          • ALL_IND_EXPRESSIONS
          • ALL_IND_PARTITIONS
          • ALL_IND_SUBPARTITIONS
          • ALL_METHOD_PARAMS
          • ALL_OBJECTS
          • ALL_PART_COL_STATISTICS
          • ALL_PART_HISTOGRAMS
          • ALL_PART_INDEXES
          • ALL_PART_KEY_COLUMNS
          • ALL_PART_TABLES
          • ALL_PROCEDURES
          • ALL_PROFILES
          • ALL_SCHEDULER_JOB_ARGS
          • ALL_SCHEDULER_PROGRAM_ARGS
          • ALL_SEQUENCES
          • ALL_SOURCE
          • ALL_SUBPART_COL_STATISTICS
          • ALL_SUBPART_HISTOGRAMS
          • ALL_SUBPARTITION_TEMPLATES
          • ALL_SUBPART_KEY_COLUMNS
          • ALL_SYNONYMS
          • ALL_TABLES
          • ALL_TAB_COL_STATISTICS
          • ALL_TAB_COLS
          • ALL_TAB_COLUMNS
          • ALL_TAB_COMMENTS
          • ALL_TAB_HISTOGRAMS
          • ALL_TAB_PARTITIONS
          • ALL_TAB_PRIVS
          • ALL_TAB_STATISTICS
          • ALL_TAB_STATS_HISTORY
          • ALL_TAB_SUBPARTITIONS
          • ALL_TRIGGERS
          • ALL_TYPES
          • ALL_TYPE_ATTRS
          • ALL_TYPE_METHODS
          • ALL_USERS
          • ALL_VIEWS
          • AUDIT_ACTIONS
          • DBA_ALL_TABLES
          • DBA_ARGUMENTS
          • DBA_AUDIT_EXISTS
          • DBA_AUDIT_OBJECT
          • DBA_AUDIT_SESSION
          • DBA_AUDIT_STATEMENT
          • DBA_AUDIT_TRAIL
          • DBA_COLL_TYPES
          • DBA_COL_COMMENTS
          • DBA_COL_PRIVS
          • DBA_CONSTRAINTS
          • DBA_CONS_COLUMNS
          • DBA_ERRORS
          • DBA_INDEXES
          • DBA_IND_COLUMNS
          • DBA_IND_EXPRESSIONS
          • DBA_IND_PARTITIONS
          • DBA_IND_SUBPARTITIONS
          • DBA_METHOD_PARAMS
          • DBA_OBJECTS
          • DBA_OBJ_AUDIT_OPTS
          • DBA_PART_INDEXES
          • DBA_PART_KEY_COLUMNS
          • DBA_PART_TABLES
          • DBA_PROCEDURES
          • DBA_PROFILES
          • DBA_ROLES
          • DBA_ROLE_PRIVS
          • DBA_SCHEDULER_JOB_ARGS
          • DBA_SCHEDULER_JOBS
          • DBA_SCHEDULER_PROGRAM
          • DBA_SCHEDULER_PROGRAM_ARGS
          • DBA_SEGMENTS
          • DBA_SEQUENCES
          • DBA_SOURCE
          • DBA_STMT_AUDIT_OPTS
          • DBA_SUBPARTITION_TEMPLATES
          • DBA_SUBPART_KEY_COLUMNS
          • DBA_SYNONYMS
          • DBA_SYS_PRIVS
          • DBA_TABLES
          • DBA_TABLESPACES
          • DBA_TAB_COLS
          • DBA_TAB_COLUMNS
          • DBA_TAB_COMMENTS
          • DBA_TAB_PARTITIONS
          • DBA_TAB_PRIVS
          • DBA_TAB_STATS_HISTORY
          • DBA_TAB_SUBPARTITIONS
          • DBA_TRIGGERS
          • DBA_TYPES
          • DBA_TYPE_ATTRS
          • DBA_TYPE_METHODS
          • DBA_USERS
          • DBA_VIEWS
          • DBA_JOBS_RUNNING
          • DBA_JOBS
          • DBA_RECYCLEBIN
          • DBA_DEPENDENCIES
          • DBA_RSRC_CONSUMER_GROUPS
          • DBA_RSRC_GROUP_MAPPINGS
          • DBA_RSRC_PLANS
          • DBA_RSRC_PLAN_DIRECTIVES
          • DBA_DIRECTORIES
          • DBA_PART_COL_STATISTICS
          • DBA_PART_HISTOGRAMS
          • DBA_SUBPART_COL_STATISTICS
          • DBA_SUBPART_HISTOGRAMS
          • DBA_TAB_COL_STATISTICS
          • DBA_TAB_HISTOGRAMS
          • DBA_TAB_STATISTICS
          • DICT
          • DICTIONARY
          • NLS_DATABASE_PARAMETERS
          • NLS_INSTANCE_PARAMETERS
          • NLS_SESSION_PARAMETERS
          • ROLE_ROLE_PRIVS
          • ROLE_SYS_PRIVS
          • ROLE_TAB_PRIVS
          • STMT_AUDIT_OPTION_MAP
          • TENANT_VIRTUAL_GLOBAL_VARIABLE
          • TENANT_VIRTUAL_SESSION_VARIABLE
          • USER_ALL_TABLES
          • USER_ARGUMENTS
          • USER_AUDIT_OBJECT
          • USER_AUDIT_SESSION
          • USER_AUDIT_STATEMENT
          • USER_AUDIT_TRAIL
          • USER_COLL_TYPES
          • USER_COL_COMMENTS
          • USER_COL_PRIVS
          • USER_CONSTRAINTS
          • USER_CONS_COLUMNS
          • USER_ERRORS
          • USER_INDEXES
          • USER_IND_COLUMNS
          • USER_IND_EXPRESSIONS
          • USER_IND_PARTITIONS
          • USER_IND_SUBPARTITIONS
          • USER_OBJECTS
          • USER_PART_INDEXES
          • USER_PART_KEY_COLUMNS
          • USER_PART_TABLES
          • USER_PROCEDURES
          • USER_PROFILES
          • USER_ROLE_PRIVS
          • USER_SEGMENTS
          • USER_SEQUENCES
          • USER_SOURCE
          • USER_SUBPARTITION_TEMPLATES
          • USER_SUBPART_KEY_COLUMNS
          • USER_SYNONYMS
          • USER_SYS_PRIVS
          • USER_TAB_STATS_HISTORY
          • USER_TAB_SUBPARTITIONS
          • USER_TRIGGERS
          • USER_TABLES
          • USER_TABLESPACES
          • USER_TAB_COLS
          • USER_TAB_COLUMNS
          • USER_TAB_COMMENTS
          • USER_TAB_PARTITIONS
          • USER_TAB_PRIVS
          • USER_TYPES
          • USER_TYPE_ATTRS
          • USER_TYPE_METHODS
          • USER_JOBS
          • USER_VIEWS
          • USER_RECYCLEBIN
          • USER_DEPENDENCIES
          • USER_PART_COL_STATISTICS
          • USER_PART_HISTOGRAMS
          • USER_SUBPART_COL_STATISTICS
          • USER_SUBPART_HISTOGRAMS
          • USER_TAB_COL_STATISTICS
          • USER_TAB_HISTOGRAMS
          • USER_TAB_STATISTICS
          • DBA_CONTEXT
        • Performance views
          • Overview
          • GV$CONCURRENT_LIMIT_SQL
          • GV$DBLINK
          • GV$GLOBAL_TRANSACTION
          • GV$INSTANCE
          • GV$LOCK
          • GV$MEMORY
          • GV$MEMSTORE
          • GV$MEMSTORE_INFO
          • GV$OB_SQL_WORKAREA_MEMORY_INFO
          • GV$OPEN_CURSOR
          • GV$OUTLINE
          • GV$PLAN_CACHE_PLAN_EXPLAIN
          • GV$PLAN_CACHE_PLAN_STAT
          • GV$PLAN_CACHE_STAT
          • GV$PS_ITEM_INFO
          • GV$PS_STAT
          • GV$SERVER_MEMSTORE
          • GV$SESSION_WAIT
          • GV$SESSION_WAIT_HISTORY
          • GV$SESSTAT
          • GV$SQL_AUDIT
          • GV$SQL_WORKAREA
          • GV$SQL_WORKAREA_ACTIVE
          • GV$SQL_WORKAREA_HISTOGRAM
          • GV$SYSSTAT
          • GV$SYSTEM_EVENT
          • GV$SSTABLE
          • GV$TENANT_MEMORY_INFO
          • V$DBLINK
          • V$ENCRYPTED_TABLES
          • V$ENCRYPTED_TABLESPACES
          • V$GLOBAL_TRANSACTION
          • V$INSTANCE
          • V$LOCK
          • V$MEMORY
          • V$MEMSTORE
          • V$MEMSTORE_INFO
          • V$NLS_PARAMETERS
          • V$OB_SQL_WORKAREA_MEMORY_INFO
          • V$OPEN_CURSOR
          • V$PLAN_CACHE_PLAN_EXPLAIN
          • V$PLAN_CACHE_PLAN_STAT
          • V$PLAN_CACHE_STAT
          • V$PS_ITEM_INFO
          • V$PS_STAT
          • V$RESTORE_POINT
          • V$RSRC_PLAN
          • V$SESSION_WAIT
          • V$SESSION_WAIT_HISTORY
          • V$SESSTAT
          • V$SQL_AUDIT
          • V$SQL_MONITOR_STATNAME
          • V$SQL_WORKAREA
          • V$SQL_WORKAREA_ACTIVE
          • V$SQL_WORKAREA_HISTOGRAM
          • V$SSTABLE
          • V$SYSSTAT
          • V$SYSTEM_EVENT
          • V$TIMEZONE_NAMES
          • V$TENANT_MEMORY_INFO
          • V$VERSION
          • GV$OB_DTL_INTERM_RESULT_MONITOR
          • V$OB_DTL_INTERM_RESULT_MONITOR
          • V$GLOBALCONTEXT
      • Error codes (MySQL mode)
        • Overview
        • 0001 to 3999
        • 4000 to 4499
        • 4500 to 4999
        • 5000 to 5999
        • 6000 to 6999
        • 7000 to 7999
        • 8000 to 8999
        • 9000 to 9499
        • 9500 to 9999
        • 22998, 30926, 38104, and 38105
      • Error codes (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
      • Reserved keywords (MySQL mode)
      • Reserved keywords (Oracle mode)
  • Develop
    • Developer guide (MySQL mode)
      • Connect to OceanBase Database
        • Overview
        • Connect to an OceanBase Database tenant by using a MySQL client
        • Connect to an OceanBase Database tenant by using OBClient
        • Connect to OceanBase Database by using ODC
      • Application development
        • Java
          • Java APIs
          • Connect Java applications to OceanBase Database
        • Python applications
        • Connect C applications to OceanBase Database
      • Create and manage database objects
        • About DDL statements
        • View the currently connected database
        • Change the password of a user
        • Data type
          • Common data types
          • Unsupported data types
        • Create database objects by using ODC
          • Create a table in ODC
          • Create a view in ODC
          • Create a function in ODC
          • Create a stored procedure in ODC
        • Create and manage tables
          • About tables
          • Create a table
          • About auto-increment columns
          • About types of column constraints
          • About table structure modification
          • About table clearing
          • About table dropping
          • Flash back a dropped table
          • About table privileges
        • Create and manage partition tables
          • About partitioned tables
          • Create a partitioned table
          • Manage a partitioned table
          • Create a subpartitioned table
          • Manage a subpartitioned table
          • Partition routing
          • Indexes on partitioned tables
          • Suggestions on using partitioned tables
        • Create and manage indexes
          • Overview
          • Create an index
          • Drop an index
        • Create and manage table groups
          • Overview
          • Create table groups
            • Create a non-partitioned table group
            • Create a subpartitioned table group
          • Specify a table group when creating a table
          • View information about a table group
          • Add a table to a table group
          • Drop a table group
        • Create and manage views
          • About views
          • Create a view
          • Modify a view
          • Drop a view
        • Create and manage sequences
          • About sequences
          • Create a sequence
          • Modify a sequence
          • Drop a sequence
        • Create and manage triggers
          • About triggers
          • Create a trigger
          • Drop a trigger
      • Query
        • Overview of queries
        • Run queries in ODC
        • Single-table queries
        • WHERE queries
        • ORDER BY queries
        • GROUP BY queries
        • Use the LIMIT clause in queries
        • Multi-table join queries
          • Multi-table join queries
          • INNER JOIN queries
          • OUTER JOIN queries
          • Subqueries
        • Use operators and functions in a query
          • Use arithmetic operators in queries
          • Use numerical functions in queries
          • Use string concatenation functions in queries
          • Use string functions in queries
          • Use date and time 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
        • Execution plan
          • View an execution plan
          • Understand an execution plan
        • Use SQL hints in queries
        • Variables of query timeout
      • DML statements and transactions
        • DML statements
          • About DML statements
          • About the INSERT statement
          • UPDATE statements
          • About the DELETE statement
          • About the REPLACE INTO statement
        • Transactions
          • About transaction control statements
          • Start a transaction
          • Transaction savepoints
          • Commit a transaction
          • Roll back a transaction
          • About transaction timeout
    • Developer guide (Oracle mode)
      • Connect to OceanBase Database
        • Overview
        • Connect to an OceanBase Database tenant by using OBClient
        • Connect to OceanBase Database by using ODC
      • Application development
        • Java
          • OceanBase Connector/J
          • Java APIs
          • Connect Java applications to OceanBase Database
        • Python
          • OceanBase Connector/J in Python
          • Python APIs
          • Connect Python applications to OceanBase Database
        • C
          • OBCI
          • OBCI APIs
          • Connect C applications to OceanBase Database
      • Create and manage database objects
        • DDL statements
        • View the currently connected database
        • Change the password of a user
        • Create database objects by Using ODC
          • Create tables, views, functions, and stored procedures in ODC
          • Create a trigger in ODC
          • Create a sequence in ODC
          • Create a program package in ODC
          • Create a synonym in ODC
          • Create a type in ODC
        • Data type
          • Data types
          • Unsupported data types
        • Create and manage tables
          • Overview
          • Create a table
          • Define an auto-increment column by using the SEQUENCE keyword
          • Types of column constraints
          • Modify the structure of a table
          • Clear a table
          • Drop a table
          • Flash back a dropped table
          • Table privileges
        • Create and manage partition tables
          • Overview
          • Create a partitioned table
          • Manage a partitioned table
          • Create a subpartitioned table
          • Manage a subpartitioned table
          • Partition routing
          • Indexing on partitioned tables
          • Recommendations for using partitioned tables
        • Create and manage indexes
          • Drop an index
          • Overview
          • Create an index
        • Create and manage table groups
          • Overview
          • Create table groups
            • Create a non-partitioned table group
            • Create a subpartitioned table group
          • Specify a table group when creating a table
          • View information about a table group
          • Add a table to a table group
          • Drop a table group
        • Create and manage views
          • About views
          • Create a view
          • Modify a view
          • Drop a view
        • Create and manage sequences
          • Overview
          • Create a sequence
          • Modify a sequence
          • Drop a sequence
        • Create and manage synonyms
          • Overview
          • Create a synonym
          • Drop a synonym
        • Create and manage triggers
          • Overview
          • Create a trigger
          • Modify a trigger
          • Drop a trigger
          • Enable or disable a trigger
      • Query
        • About queries
        • Run queries in ODC
        • Single-table queries
        • Conditional queries
        • ORDER BY queries
        • GROUP BY queries
        • Use Row_Limiting_Clause in queries
        • Multi-table join queries
          • Multi-table join queries
          • INNER JOIN queries
          • OUTER JOIN queries
          • Subqueries
        • Use operators and functions in a query
          • Use arithmetic operators in queries
          • Use numerical functions in queries
          • Use string connectors 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
        • Execution plan
          • View execution plans of queries
          • Understand execution plans
        • Use SQL hints in queries
        • About query timeout variables
      • DML statements and transactions
        • DML statements
          • About DML statements
          • About the INSERT statement
          • About the UPDATE statement
          • About the MERGE statement
          • About the DELETE statement
        • Transactions
          • About transaction control statements
          • Start a transaction
          • Transaction savepoints
          • Commit a transaction
          • Roll back a transaction
          • About transaction timeout
    • Data migration
      • About data migration and synchronization
      • Migrate data by using OMS
      • Export and import data by using ODC
        • Overview
        • Export and import file formats
        • Batch export and import
        • Single table export and import
      • Migrate data by using SQL scripts
        • Common SQL scripts for data migration
        • Export data by using OUTFILE statements
        • Export data by using the LOAD DATA statement
      • Migrate data by using mysqldump
      • Migrate data by using OBLOADER & OBDUMPER
        • Import data by using OBLOADER
        • Export data by using OBDUMPER
      • Migrate data by using DataX
        • DataX
        • Examples of using DataX in OceanBase Database
    • Design conventions and constraints
      • Object naming conventions
        • Overview
        • Tenant naming conventions
        • User naming conventions
        • Table naming conventions
        • Field naming conventions
        • Other naming conventions
      • Object structure conventions
        • Field design
        • Table structure design
        • Partitioned table design
        • Index design
        • Other structural designs
      • Character set specifications
      • Database connection specifications
      • Best practices for database design
        • Configuration example (database connection pool)
          • Overview of database connection pool configuration
          • Example of configuring a Tomcat connection pool
          • Example of configuring a C3P0 connection pool
          • Example of configuring a Proxool connection pool
          • Example of configuring a HiKariCP connection pool
          • Example of configuring a DBCP connection pool
          • CommonPool configuration example
          • Example of configuring a JDBC connection pool
        • Development framework connection example
          • SpringBoot connection example
          • SpringBatch connection example
          • SpringJDBC connection example
          • SpringJPA connection example
          • Hibernate connection example
          • MyBatis connection example
        • Use of table comments
        • ORM conventions
        • Exception handling
    • SQL syntax
      • System tenant
        • Overview
        • ALTER SYSTEM
          • BACKUP
          • BALANCE TASK
          • BOOTSTRAP
          • CANCEL MIGRATE UNIT
          • CHANGE TENANT
          • CLUSTER
          • CONVERT
          • DELETE BACKUPSET
          • DELETE OBSOLETE BACKUP
          • FAILOVER
          • FLUSH PLAN CACHE
          • JOB
          • MERGE
          • MIGRATE UNIT
          • PARAMETER
          • REFRESH
          • REPLICA
          • RESTORE
          • ROOTSERVICE
          • SERVER
          • SET STANDBY CLUSTER
          • SWITCHOVER
          • THROTTLE
          • UPGRADE
          • VALIDATE
          • ZONE
        • ALTER RESOURCE POOL
        • 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)
        • Elements
          • Data type
            • Overview
            • Numeric data types
              • Overview
              • Integer data types
              • Fixed-point data types
              • Floating-point data types
              • Bit value data type
            • Date and time data types
              • Overview
              • DATE, DATETIME, and TIMESTAMP types
              • TIME type
              • YEAR type
            • Character data types
              • Overview
              • CHAR and VARCHAR
              • BINARY and VARBINARY
            • BLOB and TEXT data types
              • Overview
              • BLOB types
              • TEXT types
            • ENUM data type
            • SET data 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 sets and collations
            • 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
            • Date and time functions
              • ADDDATE
              • CONVERT_TZ
              • CURDATE
              • CURRENT_DATE
              • CURRENT_TIME
              • CURRENT_TIMESTAMP
              • CURTIME
              • DATE
              • DATE_ADD
              • DATE_FORMAT
              • DATE_SUB
              • DATEDIFF
              • DAYOFMONTH
              • DAYOFWEEK
              • DAYOFYEAR
              • EXTRACT
              • FROM_DAYS
              • FROM_UNIXTIME
              • GET_FORMAT
              • HOUR
              • LAST_DAY
              • LOCALTIME
              • LOCALTIMESTAMP
              • MAKEDATE
              • MAKETIME
              • MICROSECOND
              • MINUTE
              • MONTH
              • MONTHNAME
              • NOW
              • PERIOD_ADD
              • PERIOD_DIFF
              • QUARTER
              • SEC_TO_TIME
              • SECOND
              • STR_TO_DATE
              • SUBDATE
              • SUBTIME
              • SYSDATE
              • TIME
              • TIME_FORMAT
              • TIME_TO_SEC
              • TIME_TO_USEC
              • TIMEDIFF
              • TIMESTAMP
              • TIMESTAMPADD
              • TIMESTAMPDIFF
              • TO_DAYS
              • TO_SECONDS
              • UNIX_TIMESTAMP
              • USEC_TO_TIME
              • UTC_DATE
              • UTC_TIME
              • UTC_TIMESTAMP
              • WEEK
              • WEEKDAY
              • WEEKOFYEAR
              • YEARWEEK
              • YEAR
              • DAY
            • String functions
              • ASCII
              • BIN
              • BIT_LENGTH
              • CHAR
              • CHAR_LENGTH
              • CONCAT
              • CONCAT_WS
              • EXPORT_SET
              • ELT
              • FIELD
              • FIND_IN_SET
              • FORMAT
              • HEX
              • INSERT
              • INSTR
              • INT2IP
              • IP2INT
              • LCASE
              • LEFT
              • LENGTH
              • LOCATE
              • LOWER
              • LPAD
              • LTRIM
              • MAKE_SET
              • MID
              • OCT
              • 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
            • Conversion functions
              • CAST
              • CONVERT
            • Mathematical functions
              • ABS
              • ACOS
              • ASIN
              • ATAN
              • ATAN2
              • BIT_COUNT
              • CEIL
              • CEILING
              • CONV
              • COS
              • COT
              • CRC32
              • DEGREES
              • EXP
              • FLOOR
              • LN
              • LOG
              • LOG10
              • LOG2
              • MOD
              • NEG
              • PI
              • POW
              • POWER
              • RADIANS
              • RAND
              • ROUND
              • SIGN
              • SIN
              • SQRT
              • TAN
              • TRUNCATE
            • Comparison functions
              • GREATEST
              • INTERVAL
              • ISNULL
              • LEAST
            • Process control functions
              • 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
          • Analytic functions
            • APPROX_COUNT_DISTINCT
            • AVG
            • 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
            • MD5
          • Information functions
            • BENCHMARK
            • CHARSET
            • COERCIBILITY
            • COLLATION
            • CONNECTION_ID
            • CURRENT_USER
            • DATABASE
            • FOUND_ROWS
            • LAST_INSERT_ID
            • SCHEMA
            • ROW_COUNT
            • SESSION_USER
            • SYSTEM_USER
            • USER
            • VERSION
            • OB_VERSION
          • JSON functions
            • Functions that create JSON values
              • JSON_ARRAY
              • JSON_OBJECT
              • JSON_QUOTE
            • Functions that search JSON values
              • JSON_CONTAINS
              • JSON_CONTAINS_PATH
              • JSON_EXTRACT
              • JSON_KEYS
              • JSON_OVERLAPS
              • JSON_SEARCH
              • JSON_VALUE
              • MEMBER OF
            • Functions that modify JSON values
              • JSON_ARRAY_APPEND
              • JSON_ARRAY_INSERT
              • JSON_INSERT
              • JSON_MERGE
              • JSON_MERGE_PATCH
              • JSON_MERGE_PRESERVE
              • JSON_REMOVE
              • JSON_REPLACE
              • JSON_SET
              • JSON_UNQUOTE
            • Functions that return JSON text attributes
              • JSON_DEPTH
              • JSON_LENGTH
              • JSON_TYPE
              • JSON_VALID
            • JSON utility functions
              • JSON_PRETTY
              • JSON_STORAGE_SIZE
            • JSON aggregate functions
              • JSON_ARRAYAGG
              • JSON_OBJECTAGG
          • Other functions
            • ANY_VALUE
            • COALESCE
            • DEFAULT
            • INET_ATON
            • INET_NTOA
            • INET6_ATON
            • INET6_NTOA
            • IS_IPV4
            • IS_IPV4_COMPAT
            • IS_IPV4_MAPPED
            • IS_IPV6
            • NVL
            • SLEEP
            • UUID
            • UUID_SHORT
            • VALUES
          • Spatial functions
            • Create a geometric function
            • Spatial operation functions
            • Spatial relation functions
            • Geometry property functions
            • Geometric format conversion functions
        • Queries and subqueries
          • Overview
          • Subqueries
          • JOIN
        • SQL statements
          • General syntax
          • CTE
          • ALTER DATABASE
          • ALTER OUTLINE
          • ALTER SEQUENCE
          • ALTER TABLE
          • ALTER TABLEGROUP
          • ALTER USER
          • ALTER VIEW
          • ANALYZE
          • CREATE DATABASE
          • CREATE INDEX
          • CREATE OUTLINE
          • CREATE RESTORE POINT
          • CREATE SEQUENCE
          • CREATE TABLE
          • CREATE TABLEGROUP
          • CREATE USER
          • CREATE VIEW
          • DEALLOCATE PREPARE
          • DELETE
          • DESCRIBE
          • DROP DATABASE
          • DROP INDEX
          • DROP OUTLINE
          • DROP RESTORE POINT
          • DROP TABLE
          • DROP TABLEGROUP
          • DROP SEQUENCE
          • DROP USER
          • DROP VIEW
          • EXECUTE
          • EXPLAIN
          • FLASHBACK
          • GRANT
          • HELP
          • INSERT
          • KILL
          • LOAD DATA
          • OPTIMIZE
          • PREPARE
          • PURGE
          • PURGE RECYCLEBIN
          • RENAME TABLE
          • RENAME USER
          • REPLACE
          • REVOKE
          • SAVEPOINT
          • SCHEMA
          • SELECT
            • SELECT
            • JOIN clause
            • OVER clause
            • UNION clause
          • SELECT INTO
          • SET
          • SET CHARSET
          • SET NAMES
          • SET PASSWORD
          • SET TRANSACTION
          • SHOW
          • TRANSACTION
          • TRUNCATE TABLE
          • UPDATE
          • USE
      • User tenants (Oracles mode)
        • SQL overview
        • Pseudocolumns
          • Overview
          • Hierarchical query pseudocolumns
          • Sequence pseudocolumns
          • ORA_ROWSCN pseudocolumn
          • ROWNUM pseudocolumn
          • ROWID pseudocolumn
        • Elements
          • Built-in data types
            • Overview of built-in data types
            • Character data types
              • Overview of character data types
              • CHAR data type
              • NCHAR data type
              • NVARCHAR2 data type
              • VARCHAR2 data type
              • VARCHAR data type
            • Numeric data types
              • Overview
              • NUMBER data type
              • FLOAT data type
              • Floating-point numbers
              • Precedence of numeric data types
            • Date, time, and interval data types
              • Overview of datetime and interval data types
              • DATE data type
              • TIMESTAMP data type
              • TIMESTAMP WITH TIME ZONE date 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
          • Comparison rules of data types
            • 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 models
            • Overview
            • Number format models
            • Datetime format models
            • RR datetime format element
            • String-to-date conversion rules
          • Null values
            • Overview of nulls
            • Nulls in SQL functions
            • Nulls in comparison conditions
            • Nulls in conditional expressions
          • Comments
            • Overview
            • Comments within SQL statements
            • Comments on schema and nonschema objects
            • Hint
              • Overview of hints
              • Lists of hints
                • 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
            • Database object names and qualifiers
            • Suggestions on schema object names
          • Methods of referencing database objects
            • Overview
            • Reference schema objects
            • Reference objects in a remote database
              • Create database links
              • Reference database links
            • Reference partition tables and indexes
            • Reference an attribute or method of an object type
        • Operators
          • Overview of operators
          • Operator precedence
          • Arithmetic operators
          • Concatenation operator
          • Hierarchical query operators
          • Set operators
          • COLLATE operator
        • Functions
          • Function overview
          • Single-row functions
            • Numeric functions
              • ABS
              • ACOS
              • ASIN
              • ATAN
              • ATAN2
              • BITAND
              • CEIL
              • COS
              • COSH
              • EXP
              • FLOOR
              • LN
              • LOG
              • MOD
              • NANVL
              • POWER
              • REMAINDER
              • ROUND
              • SIGN
              • SIN
              • SINH
              • SQRT
              • TAN
              • TANH
              • TRUNC
              • WIDTH_BUCKET
            • String functions that return strings
              • CHR
              • CONCAT
              • INITCAP
              • LOWER
              • LPAD
              • LTRIM
              • NLS_LOWER
              • 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
            • General comparison functions
              • GREATEST
              • LEAST
            • Conversion functions
              • ASCIISTR
              • CAST
              • CHARTOROWID
              • CONVERT
              • HEXTORAW
              • NUMTODSINTERVAL
              • NUMTOYMINTERVAL
              • RAWTOHEX
              • ROWIDTOCHAR
              • ROWIDTONCHAR
              • 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
            • XML functions
              • XMLAGG
              • XMLATTRIBUTES
              • XMLELEMENT
              • XMLPARSE
          • 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) Functions
            • ROLLUP
            • STDDEV
            • STDDEV_POP
            • STDDEV_SAMP
            • SUM
            • VAR_POP
            • VAR_SAMP
            • VARIANCE
            • WMSYS.WM_CONCAT/WM_CONCAT
          • Analytic 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) Functions
            • 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 of SQL conditions
          • 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 of queries and subqueries
          • Simple query
          • Hierarchical query
          • Compound queries
          • Join queries
          • Subquery
          • DUAL table query
        • SQL statements
          • DDL
            • 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 DIRECTORY
            • CREATE DATABASE LINK
            • CREATE INDEX
            • CREATE KEYSTORE
            • CREATE OUTLINE
            • CREATE PROFILE
            • CREATE RESTORE POINT
            • CREATE ROLE
            • CREATE SEQUENCE
            • CREATE SYNONYM
            • CREATE TABLE
            • CREATE TABLEGROUP
            • CREATE TABLESPACE
            • CREATE USER
            • CREATE VIEW
            • DROP DIRECTORY
            • DROP DATABASE LINK
            • DROP INDEX
            • DROP OUTLINE
            • DROP PROFILE
            • DROP RESTORE POINT
            • DROP ROLE
            • DROP SEQUENCE
            • DROP SYNONYM
            • DROP TABLE
            • DROP TABLEGROUP
            • DROP TABLESPACE
            • DROP USER
            • DROP VIEW
            • RENAME
            • TRUNCATE TABLE
          • DML
            • DELETE
            • INSERT
            • MERGE
            • PURGE
            • SELECT
              • SIMPLE SELECT
              • Set-based SELECT
              • WITH clause
            • UPDATE
          • DCL
            • ANALYZE
            • AUDIT
            • COMMENT
            • COMMIT
            • EXPLAIN
            • FLASHBACK TABLE BEFORE DROP
            • GRANT
            • KILL
            • REVOKE
            • ROLLBACK
            • SAVEPOINT
            • SET NAMES
            • SET PASSWORD
            • SET ROLE
            • SET VARIABLE
            • SHOW
            • SHRINK
            • TRANSACTION
    • PL reference
      • What is PL?
        • Overview
        • Main features of PL
        • PL architecture
      • PL reference (MySQL mode)
        • Syntax of PL stored programs
        • Stored programs
          • Overview
          • Variables in stored programs
          • Stored procedures
          • Stored functions
          • Triggers
          • Access control and account management
          • Limitations on stored programs
        • Cursors
          • Overview
          • Cursor execution process
          • Limitations on server cursors
        • Conditional control statements
          • CASE
          • IF
          • ITERATE
          • LEAVE
          • LOOP
          • REPEAT
          • RETURN
          • WHILE
        • Data manipulation statements
          • CALL
          • DO
        • Data definition statements
          • CREATE FUNCTION
          • CREATE PROCEDURE
          • CREATE TRIGGER
          • DROP FUNCTION
          • DROP PROCEDURE
          • DROP TRIGGER
        • Database management statements
          • SHOW CREATE FUNCTION
          • SHOW CREATE PROCEDURE
          • SHOW CREATE TRIGGER
          • SHOW FUNCTION STATUS
          • SHOW PROCEDURE STATUS
          • SHOW TRIGGERS
        • Dictionary view
          • INFORMATION_SCHEMA PARAMETERS
          • INFORMATION_SCHEMA ROUTINES
          • INFORMATION_SCHEMA TRIGGERS
        • 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 packages
          • 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
            • DELETE_COLUMN_STATS
            • DELETE_TABLE_STATS
            • EXPORT_COLUMN_STATS
            • EXPORT_TABLE_STATS
            • FLUSH_DATABASE_MONITORING_INFO
            • GATHER_TABLE_STATS
            • IMPORT_COLUMN_STATS
            • IMPORT_TABLE_STATS
            • LOCK_PARTITION_STATS
            • LOCK_SCHEMA_STATS
            • LOCK_TABLE_STATS
            • SET_COLUMN_STATS
            • SET_TABLE_STATS
            • UNLOCK_PARTITION_STATS
            • UNLOCK_SCHEMA_STATS
            • UNLOCK_TABLE_STATS
        • Reserved and non-reserved PL keywords
      • PL reference (Oracle mode)
        • Language basics
          • Character sets
          • Lexical units
          • Declaration
          • Reference identifiers
          • Scope and visibility of identifiers
          • Assign values
          • Expressions
          • PL blocks
          • Subprograms
          • Error-reporting functions
        • Data types
          • Overview
          • SQL data types
          • LOB data types
          • BOOLEAN type
          • User-defined subtypes
          • PLS_INTEGER and BINARY_INTEGER
          • Arrays
        • Flow control
          • Overview
          • Conditional control
          • Loop control
          • Sequential control
        • Collections and records
          • Overview
          • Collections
          • Associative arrays
          • Varrays
          • Nested tables
          • Collection constructor function
          • Collection methods
            • Overview of collection methods
            • 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
        • Static SQL
          • Overview
          • Cursors
            • Overview
            • Cursor attributes
            • Implicit cursors
            • Explicit cursors
            • Cursor variables
            • Traverse cursor data by using the FOR loop
            • Modify and drop a cursor
          • Transaction processing and control
          • Autonomous transactions
            • Overview
            • Control autonomous transactions
            • Autonomous triggers
        • Dynamic SQL
          • Overview
          • Execute dynamic SQL statements
          • DBMS_SQL system package
        • Stored procedures and functions
          • Overview
          • Create a stored procedure
          • Create a function
          • Manage stored procedures and functions
          • Privilege control
          • User-defined aggregate functions
            • Overview
            • Interface for user-defined aggregate functions
            • Create user-defined aggregate functions
            • Use user-defined aggregate functions
        • Triggers
          • Overview
          • Create a DML trigger
          • Modify and drop a trigger
          • Disable or enable a trigger
          • Query trigger information
          • INSTEAD OF DML trigger
        • Packages
          • Overview
          • Create a program package
          • Overloaded programs in a package
          • Manage program packages
          • Definition of the PL environment by the STANDARD package
        • 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 packages
          • Overview
          • DBMS_APPLICATION_INFO
            • Overview
            • READ_CLIENT_INFO
            • READ_MODULE
            • SET_ACTION
            • SET_CLIENT_INFO
            • SET_MODULE
          • 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
            • COMPARE
            • COPY
            • CREATETEMPORARY
            • ERASE
            • FREETEMPORARY
            • GETLENGTH
            • ISOPEN
            • INSTR
            • OPEN
            • READ
            • SUBSTR
            • TRIM
            • WRITE
            • WRITEAPPEND
          • DBMS_LOCK
            • Overview
            • SLEEP
          • DBMS_METADATA
            • Overview
            • GET_DDL
          • DBMS_OUTPUT
            • Overview
            • DISABLE
            • ENABLE
            • GET_LINE
            • GET_LINES
            • NEW_LINE
            • PUT
            • PUT_LINE
          • DBMS_PLAN_CACHE
            • Overview
            • PURGE
          • DBMS_RANDOM
            • Overview
            • INITIALIZE
            • NORMAL
            • RANDOM
            • SEED
            • STRING
            • TERMINATE
            • VALUE
          • DBMS_RESOURCE_MANAGER
            • Overview
            • CREATE_CONSUMER_GROUP
            • CREATE_PLAN
            • CREATE_PLAN_DIRECTIVE
            • DELETE_CONSUMER_GROUP
            • DELETE_PLAN
            • DELETE_PLAN_DIRECTIVE
            • SET_CONSUMER_GROUP_MAPPING
            • UPDATE_PLAN_DIRECTIVE
          • DBMS_SCHEDULER
            • Overview
            • CREATE_JOB
            • CREATE_PROGRAM
            • DEFINE_PROGRAM_ARGUMENT
            • DISABLE
            • DROP_JOB
            • DROP_PROGRAM
            • ENABLE
            • GENERATE_JOB_NAME
            • RUN_JOB
            • SET_ATTRIBUTE
            • SET_JOB_ARGUMENT_VALUE
          • DBMS_SESSION
            • Overview
            • CLEAR_ALL_CONTEXT
            • CLEAR_CONTEXT
            • CLEAR_IDENTIFIER
            • 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
            • OPEN_CURSOR
            • PARSE
          • DBMS_STATS
            • Overview
            • DELETE_COLUMN_STATS
            • DELETE_TABLE_STATS
            • EXPORT_COLUMN_STATS
            • EXPORT_TABLE_STATS
            • FLUSH_DATABASE_MONITORING_INFO
            • GATHER_TABLE_STATS
            • IMPORT_COLUMN_STATS
            • IMPORT_TABLE_STATS
            • LOCK_PARTITION_STATS
            • LOCK_SCHEMA_STATS
            • LOCK_TABLE_STATS
            • SET_COLUMN_STATS
            • SET_TABLE_STATS
            • UNLOCK_PARTITION_STATS
            • UNLOCK_SCHEMA_STATS
            • UNLOCK_TABLE_STATS
          • 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_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
          • 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_FILE
            • Overview
            • FCLOSE
            • FFLUSH
            • FOPEN
            • FGETPOS
            • FREMOVE
            • FRENAME
            • FSEEK
            • NEW_LINE
            • GET_LINE
            • PUT
            • PUT_LINE
          • UTL_ENCODE
            • Overview
            • BASE64_DECODE
            • BASE64_ENCODE
          • UTL_I18N
            • Overview
            • RAW_TO_CHAR
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          • UTL_RAW
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Documentation Revision History Document Overview Overview Concepts Compatibility with MySQL Management tools Version rules Limitations Deployment introduction Deployment process HA solution for OceanBase clusters Overview Migrate data by using SQL scripts Migrate data by using mysqldump Migrate data by using DataX Migrate data by using the OUTFILE statement OverviewPhysical connections Overview of data distribution Overview Case analysis RPC connection authentication Set row-level access control Reserved keywords (MySQL mode) Reserved keywords (Oracle mode) About data migration and synchronization Migrate data by using OMS Migrate data by using mysqldump Character set specifications Database connection specifications Limits on writing SQL statementsArchitecture of OceanBase Database Development of OceanBase Database Overview Compatibility modes System tenants User tenants Overview Cluster architecture Overview Client programming languages Overview Multi-level caching Query processing Deployment solutions for disaster recovery Overview Identity authenticationAccess control Data transmission encryption Data storage encryption Monitoring and alerts Security audit Structure of the OBServer installation directoryConfiguration files Logs Appendix: Basic concepts of OceanBase Database 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 OceanBase Database Enterprise Edition V3.1.2 OceanBase Database Enterprise Edition V3.1.1 OceanBase Database Enterprise Edition V2.2.77
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Last Updated:2023-10-24 09:23:03  Updated
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ERROR 4507 (42000): Convert error
ERROR 4512 (HY000): RootServer state error
ERROR 4515 (HY000): No replica is valid
ERROR 4519 (HY000): Iteration was stopped
ERROR 4530 (HY000): Zone info \'%s\' not exist
ERROR 4544 (42000): Root not integrated
ERROR 4547 (HY000): global merge not started
ERROR 4548 (HY000): merge already started
ERROR 4549 (HY000): rootservice already exist
ERROR 4550 (HY000): rootservice is shutdown
ERROR 4551 (HY000): server migrate in denied
ERROR 4552 (HY000): rebalance task can not executing now
ERROR 4554 (HY000): rebalance task not in progress on observer
ERROR 4605 (HY000): Data source timeout
ERROR 4615 (HY000): tablegroup is not empty
ERROR 4620 (HY000): server status is not valid
ERROR 4621 (HY000): wait elect partition leader timeout
ERROR 4622 (HY000): wait all rs online timeout
ERROR 4624 (HY000): machine resource '%s' is not enough to hold a new unit
ERROR 4626 (HY000): resource pool \'%s\' has already been granted to a tenant
ERROR 4628 (HY000): server has already been deleted
ERROR 4629 (HY000): server is not in deleting status
ERROR 4630 (HY000): server not in server white list
ERROR 4631 (HY000): server zone not match
ERROR 4632 (HY000): zone num has reach max zone num
ERROR 4633 (HY000): zone status not match
ERROR 4634 (HY000): resource unit \'%s\' is referenced by some resource pool
ERROR 4636 (HY000): table schema primary zone different with other table in sample tablegroup
ERROR 4637 (HY000): server is not active
ERROR 4638 (HY000): The RootServer is not the master
ERROR 4640 (HY000): The chosen partition servers belong to same zone
ERROR 4641 (HY000): Duplicated zone \'%s\' in zone list %s
ERROR 4646 (HY000): tenant name \'%s\' over max_tenant_name_length %ld
ERROR 4647 (HY000): resource pool list is empty
ERROR 4648 (HY000): resource unit \'%s\' not exist
ERROR 4649 (HY000): resource unit \'%s\' already exist
ERROR 4650 (HY000): resource pool \'%s\' not exist
ERROR 4651 (HY000): resource pool \'%s\' exist
ERROR 4652 (HY000): wait leader switch timeout
ERROR 4653 (HY000): location not exist
ERROR 4654 (HY000): location leader not exist
ERROR 4655 (HY000): zone not active
ERROR 4656 (HY000): resource pool unit num is bigger than zone server count
ERROR 4657 (HY000): resource pool list %s unit servers intersect
ERROR 4659 (HY000) : invalid resource unit, %s\'s min value is %s
ERROR 4660 (HY000): Can not stop server in multiple zones, there are already servers stopped in zone:%s
ERROR 4661 (HY000): Session already exist
ERROR (HY000): Timeout OB_GET_LOCATION_TIME_OUT
ERROR 4666 (HY000): cluster name does not match to \'%s\'
ERROR 4667 (HY000): Please check new zone in zone_merge_order. You can show parameters like 'zone_merge_order'
ERROR 4668 (HY000): The zone is not empty and can not be deleted. You should delete the servers of the zone. There are %ld servers alive and %ld not alive
ERROR 4671 (HY000): full replica num not enough
ERROR 4672 (HY000): replica num not enough
ERROR 4674 (HY000): run job not success yet
ERROR 4675 (HY000): no need to rebuild
ERROR 4676 (HY000): need remove unneed table
ERROR 4677 (HY000): no need to merge
ERROR 4681 (HY000): rpc need reconnect
ERROR 4683 (HY000): src do not allowed migrate
ERROR 4684 (HY000): Too many partitions were defined for this tenant
ERROR 4685 (HY000): active memtable not exist
ERROR 4686 (HY000): Should use leader replica for duplicate table after DML operator
ERROR 4688 (HY000): standby cluster support weak read only
ERROR 4690 (HY000): other primary cluster already exist, can not start as primary
ERROR 4691 (HY000): array binding needs to switch iterator
ERROR 4692 (HY000): standby cluster not empty
ERROR 4693 (HY000): not primary cluster
ERROR 4694 (HY000): check drop column failed
ERROR 4695 (HY000): not standby cluster
ERROR 4696 (HY000): cluster version not compatible
ERROR 4697 (HY000): wait trans table merge finish timeout
ERROR 4698 (HY000): skip renew location by rpc
ERROR 4699 (HY000): renew location by rpc failed
ERROR 4700 (HY000): cluster id does not match
ERROR 4701 (HY000): parameter cannot be modified because specified value is invalid
ERROR 4702 (HY000): %s %.*s already exists
ERROR 4703 (HY000): resource plan %.*s does not exist
ERROR 4704 (HY000): value %ld for %s is outside valid range of 0 to 100
ERROR 4705 (HY000): plan directive %.*s, %.*s does not exist
ERROR 4706 (HY000): plan directive %.*s, %.*s already exists
ERROR 4707 (HY000) : plan directive name '%.*s' not supported.
ERROR 4708 (HY000): Failover is not allowed
ERROR 4709 (HY000): Add cluster not allowed. Actions: %s
ERROR 4710 (HY000): consumer group %.*s does not exist
ERROR 4711 (HY000): cluster is not accessible, cluster_id: %ld
ERROR 4712 (HY000): rebuild global index:'%.*s' failed when drop/truncate partitions
ERROR 4713 (HY000): unique/primary keys in table referenced by enabled foreign keys
ERROR 4719 (HY000): partition has been dropped

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These error codes indicate RootService errors.

ERROR 4507 (42000): Convert error

  • Error code in OceanBase Database: 4507

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

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

ERROR 4512 (HY000): RootServer state error

  • Error code in OceanBase Database: 4512

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

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

ERROR 4515 (HY000): No replica is valid

  • Error code in OceanBase Database: 4515

  • Cause: The replica status is invalid.

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

ERROR 4519 (HY000): Iteration was stopped

  • Error code in OceanBase Database: 4519

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

  • Solution: Troubleshooting is not required.

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

  • Error code in OceanBase Database: 4530

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

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

ERROR 4544 (42000): Root not integrated

  • Error code in OceanBase Database: 4544

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

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

ERROR 4547 (HY000): global merge not started

  • Error code in OceanBase Database: 4547

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

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

ERROR 4548 (HY000): merge already started

  • Error code in OceanBase Database: 4548

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

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

ERROR 4549 (HY000): rootservice already exist

  • Error code in OceanBase Database: 4549

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

  • Solution: Troubleshooting is not required.

ERROR 4550 (HY000): rootservice is shutdown

  • Error code in OceanBase Database: 4550

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

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

ERROR 4551 (HY000): server migrate in denied

  • Error code in OceanBase Database: 4551

  • Cause: An OBServer node may fail to execute a balance task due to full disk usage or excessive partitions. In this case, the OBServer node returns the balance task execution failure with this error code to the RootService.

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

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

  • Error code in OceanBase Database: 4552

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

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

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

  • Error code in OceanBase Database: 4554

  • Cause: The RootService regularly initiates remote procedure calls (RPCs) to the current OBServer node to check whether the initiated balance task exists. If the balance task no longer exists, the RootService identifies that the balance task has ended and returns this error.

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

ERROR 4605 (HY000): Data source timeout

  • Error code in OceanBase Database: 4605

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

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

ERROR 4615 (HY000): tablegroup is not empty

  • Error code in OceanBase Database: 4615

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

    • The specified table group contains tables.

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

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

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

ERROR 4620 (HY000): server status is not valid

  • Error code in OceanBase Database: 4620

  • Cause: One or more OBServer parameters are invalid.

  • Solution: Modify the OBServer parameter settings.

ERROR 4621 (HY000): wait elect partition leader timeout

  • Error code in OceanBase Database: 4621

  • Cause: Leader election timed out.

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

ERROR 4622 (HY000): wait all rs online timeout

  • Error code in OceanBase Database: 4622

  • Cause:

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

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

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

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

  • Error code in OceanBase Database: 4624

  • Cause:

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

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

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

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

  • Error code in OceanBase Database: 4626

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

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

    • Delete the tenant.

    • Remove the resource pool from the tenant.

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

ERROR 4628 (HY000): server has already been deleted

  • Error code in OceanBase Database: 4628

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

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

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

  • Error code in OceanBase Database: 4629

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

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

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

  • Error code in OceanBase Database: 4630

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

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

    • The cluster is in the bootstrapping process.

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

    • The server sends a request to the current cluster.

  • Solution:

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

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

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

ERROR 4631 (HY000): server zone not match

  • Error code in OceanBase Database: 4631

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

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

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

  • Error code in OceanBase Database: 4632

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

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

ERROR 4633 (HY000): zone status not match

  • Error code in OceanBase Database: 4633

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

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

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

  • Error code in OceanBase Database: 4634

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

  • Solution:

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

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

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

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

  • Error code in OceanBase Database: 4636

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

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

ERROR 4637 (HY000): server is not active

  • Error code in OceanBase Database: 4637

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

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

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

  • Error code in OceanBase Database: 4638

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

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

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

  • Error code in OceanBase Database: 4640

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

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

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

  • Error code in OceanBase Database: 4641

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

  • Solution: Remove redundant zones from the zone_list parameter.

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

  • Error code in OceanBase Database: 4646

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

  • Solution: Modify the tenant_name parameter.

ERROR 4647 (HY000): resource pool list is empty

  • Error code in OceanBase Database: 4647

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

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

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

  • Error code in OceanBase Database: 4648

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

  • Solution: Check whether the specified resource pool exists.

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

  • Error code in OceanBase Database: 4649

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

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

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

  • Error code in OceanBase Database: 4650

  • Cause: The specified resource pool does not exist.

  • Solution: Check whether the specified resource pool exists.

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

  • Error code in OceanBase Database: 4651

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

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

ERROR 4652 (HY000): wait leader switch timeout

  • Error code in OceanBase Database: 4652

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

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

ERROR 4653 (HY000): location not exist

  • Error code in OceanBase Database: 4653

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

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

ERROR 4654 (HY000): location leader not exist

  • Error code in OceanBase Database: 4654

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

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

ERROR 4655 (HY000): zone not active

  • Error code in OceanBase Database: 4655

  • Cause: The specified zone is inactive.

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

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

  • Error code in OceanBase Database: 4656

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

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

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

  • Error code in OceanBase Database: 4657

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

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

ERROR 4659 (HY000) : invalid resource unit, %s\'s min value is %s

  • Error code in OceanBase Database: 4659

  • Cause: The specified resource unit specification is invalid.

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

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

  • Error code in OceanBase Database: 4660

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

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

ERROR 4661 (HY000): Session already exist

  • Error code in OceanBase Database: 4661

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

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

ERROR (HY000): Timeout OB_GET_LOCATION_TIME_OUT

  • Error code in OceanBase Database: 4664

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

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

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

  • Error code in OceanBase Database: 4666

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

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

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

  • Error code in OceanBase Database: 4667

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

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

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

  • Error code in OceanBase Database: 4668

  • Cause: The zone to be deleted contains servers.

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

ERROR 4671 (HY000): full replica num not enough

  • Error code in OceanBase Database: 4671

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

  • Solution: Contact OceanBase Technical Support for troubleshooting.

ERROR 4672 (HY000): replica num not enough

  • Error code in OceanBase Database: 4672

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

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

ERROR 4674 (HY000): run job not success yet

  • Error code in OceanBase Database: 4674

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

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

ERROR 4675 (HY000): no need to rebuild

  • Error code in OceanBase Database: 4675

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

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

ERROR 4676 (HY000): need remove unneed table

  • Error code in OceanBase Database: 4676

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

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

ERROR 4677 (HY000): no need to merge

  • Error code in OceanBase Database: 4677

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

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

ERROR 4681 (HY000): rpc need reconnect

  • Error code in OceanBase Database: 4681

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

ERROR 4683 (HY000): src do not allowed migrate

  • Error code in OceanBase Database: 4683

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

  • Solution: Try again.

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

  • Error code in OceanBase Database: 4684

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

  • Solution: Check whether the recycle bin contains partitions.

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

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

ERROR 4685 (HY000): active memtable not exist

  • Error code in OceanBase Database: 4685

  • Cause: No active MemTable exists.

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

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

  • Error code in OceanBase Database: 4686

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

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

ERROR 4688 (HY000): standby cluster support weak read only

  • Error code in OceanBase Database: 4688

  • Cause: A standby cluster supports only weak consistency reads.

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

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

  • Error code in OceanBase Database: 4690

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

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

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

  • Error code in OceanBase Database: 4691

  • Cause: The iterator has stopped.

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

ERROR 4692 (HY000): standby cluster not empty

  • Error code in OceanBase Database: 4692

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

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

ERROR 4693 (HY000): not primary cluster

  • Error code in OceanBase Database: 4693

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

  • Solution: Query the V$OB_CLUSTER view to check the role of the current cluster.

ERROR 4694 (HY000): check drop column failed

  • Error code in OceanBase Database: 4694

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

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

ERROR 4695 (HY000): not standby cluster

  • Error code in OceanBase Database: 4695

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

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

ERROR 4696 (HY000): cluster version not compatible

  • Error code in OceanBase Database: 4696

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

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

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

  • Error code in OceanBase Database: 4697

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

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

ERROR 4698 (HY000): skip renew location by rpc

  • Error code in OceanBase Database: 4698

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

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

ERROR 4699 (HY000): renew location by rpc failed

  • Error code in OceanBase Database: 4699

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

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

ERROR 4700 (HY000): cluster id does not match

  • Error code in OceanBase Database: 4700

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

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

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

  • Error code in OceanBase Database: 4701

  • Cause: The specified parameter value is invalid.

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

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

  • Error code in OceanBase Database: 4702

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

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

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

  • Error code in OceanBase Database: 4703

  • Cause: The specified resource plan does not exist.

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

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

  • Error code in OceanBase Database: 4704

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

  • Solution: Specify a valid value.

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

  • Error code in OceanBase Database: 4705

  • Cause: The specified plan directive does not exist.

  • Solution: Specify a valid plan directive name.

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

  • Error code in OceanBase Database: 4706

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

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

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

  • Error code in OceanBase Database: 4707

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

  • Solution: Specify a valid plan directive name.

ERROR 4708 (HY000): Failover is not allowed

  • Error code in OceanBase Database: 4708

  • Cause: Failovers are not allowed.

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

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

  • Error code in OceanBase Database: 4709

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

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

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

  • Error code in OceanBase Database: 4710

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

  • Solution: Specify a valid user resource group name.

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

  • Error code in OceanBase Database: 4711

  • Cause: The specified cluster is inaccessible.

  • Solution: Check whether the value of cluster_id is valid. If yes, check whether the cluster is accessible and whether the RootService is running properly.

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

  • Error code in OceanBase Database: 4712

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

  • Solution:

    1. Identify the related invalid indexes.

    2. Delete the invalid indexes.

    3. Rebuild indexes.

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

  • Error code in OceanBase Database: 4713

  • Cause: The operation conflicts with a foreign key.

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

ERROR 4719 (HY000): partition has been dropped

  • Error code in OceanBase Database: 4719

  • Cause: The partition was dropped during the migration.

  • Solution: The system automatically retries the partition migration. No manual intervention is required.

What is on this page
ERROR 4507 (42000): Convert error
ERROR 4512 (HY000): RootServer state error
ERROR 4515 (HY000): No replica is valid
ERROR 4519 (HY000): Iteration was stopped
ERROR 4530 (HY000): Zone info \'%s\' not exist
ERROR 4544 (42000): Root not integrated
ERROR 4547 (HY000): global merge not started
ERROR 4548 (HY000): merge already started
ERROR 4549 (HY000): rootservice already exist
ERROR 4550 (HY000): rootservice is shutdown
ERROR 4551 (HY000): server migrate in denied
ERROR 4552 (HY000): rebalance task can not executing now
ERROR 4554 (HY000): rebalance task not in progress on observer
ERROR 4605 (HY000): Data source timeout
ERROR 4615 (HY000): tablegroup is not empty
ERROR 4620 (HY000): server status is not valid
ERROR 4621 (HY000): wait elect partition leader timeout
ERROR 4622 (HY000): wait all rs online timeout
ERROR 4624 (HY000): machine resource '%s' is not enough to hold a new unit
ERROR 4626 (HY000): resource pool \'%s\' has already been granted to a tenant
ERROR 4628 (HY000): server has already been deleted
ERROR 4629 (HY000): server is not in deleting status
ERROR 4630 (HY000): server not in server white list
ERROR 4631 (HY000): server zone not match
ERROR 4632 (HY000): zone num has reach max zone num
ERROR 4633 (HY000): zone status not match
ERROR 4634 (HY000): resource unit \'%s\' is referenced by some resource pool
ERROR 4636 (HY000): table schema primary zone different with other table in sample tablegroup
ERROR 4637 (HY000): server is not active
ERROR 4638 (HY000): The RootServer is not the master
ERROR 4640 (HY000): The chosen partition servers belong to same zone
ERROR 4641 (HY000): Duplicated zone \'%s\' in zone list %s
ERROR 4646 (HY000): tenant name \'%s\' over max_tenant_name_length %ld
ERROR 4647 (HY000): resource pool list is empty
ERROR 4648 (HY000): resource unit \'%s\' not exist
ERROR 4649 (HY000): resource unit \'%s\' already exist
ERROR 4650 (HY000): resource pool \'%s\' not exist
ERROR 4651 (HY000): resource pool \'%s\' exist
ERROR 4652 (HY000): wait leader switch timeout
ERROR 4653 (HY000): location not exist
ERROR 4654 (HY000): location leader not exist
ERROR 4655 (HY000): zone not active
ERROR 4656 (HY000): resource pool unit num is bigger than zone server count
ERROR 4657 (HY000): resource pool list %s unit servers intersect
ERROR 4659 (HY000) : invalid resource unit, %s\'s min value is %s
ERROR 4660 (HY000): Can not stop server in multiple zones, there are already servers stopped in zone:%s
ERROR 4661 (HY000): Session already exist
ERROR (HY000): Timeout OB_GET_LOCATION_TIME_OUT
ERROR 4666 (HY000): cluster name does not match to \'%s\'
ERROR 4667 (HY000): Please check new zone in zone_merge_order. You can show parameters like 'zone_merge_order'
ERROR 4668 (HY000): The zone is not empty and can not be deleted. You should delete the servers of the zone. There are %ld servers alive and %ld not alive
ERROR 4671 (HY000): full replica num not enough
ERROR 4672 (HY000): replica num not enough
ERROR 4674 (HY000): run job not success yet
ERROR 4675 (HY000): no need to rebuild
ERROR 4676 (HY000): need remove unneed table
ERROR 4677 (HY000): no need to merge
ERROR 4681 (HY000): rpc need reconnect
ERROR 4683 (HY000): src do not allowed migrate
ERROR 4684 (HY000): Too many partitions were defined for this tenant
ERROR 4685 (HY000): active memtable not exist
ERROR 4686 (HY000): Should use leader replica for duplicate table after DML operator
ERROR 4688 (HY000): standby cluster support weak read only
ERROR 4690 (HY000): other primary cluster already exist, can not start as primary
ERROR 4691 (HY000): array binding needs to switch iterator
ERROR 4692 (HY000): standby cluster not empty
ERROR 4693 (HY000): not primary cluster
ERROR 4694 (HY000): check drop column failed
ERROR 4695 (HY000): not standby cluster
ERROR 4696 (HY000): cluster version not compatible
ERROR 4697 (HY000): wait trans table merge finish timeout
ERROR 4698 (HY000): skip renew location by rpc
ERROR 4699 (HY000): renew location by rpc failed
ERROR 4700 (HY000): cluster id does not match
ERROR 4701 (HY000): parameter cannot be modified because specified value is invalid
ERROR 4702 (HY000): %s %.*s already exists
ERROR 4703 (HY000): resource plan %.*s does not exist
ERROR 4704 (HY000): value %ld for %s is outside valid range of 0 to 100
ERROR 4705 (HY000): plan directive %.*s, %.*s does not exist
ERROR 4706 (HY000): plan directive %.*s, %.*s already exists
ERROR 4707 (HY000) : plan directive name '%.*s' not supported.
ERROR 4708 (HY000): Failover is not allowed
ERROR 4709 (HY000): Add cluster not allowed. Actions: %s
ERROR 4710 (HY000): consumer group %.*s does not exist
ERROR 4711 (HY000): cluster is not accessible, cluster_id: %ld
ERROR 4712 (HY000): rebuild global index:'%.*s' failed when drop/truncate partitions
ERROR 4713 (HY000): unique/primary keys in table referenced by enabled foreign keys
ERROR 4719 (HY000): partition has been dropped