Overview|V4.4.2| docs|Distributed Database

Parameter	Description
mysql_port	The port number of the SQL service protocol.
rpc_port	The port number of the remote access protocol.
sql_protocol_min_tls_version	The minimum SSL/TLS protocol version for SSL connections to the database.
ssl_client_authentication	Whether to enable SSL connections.
ssl_external_kms_info	The information required for the SSL feature of OceanBase Database to run. This parameter records the related configurations required for different SSL usage scenarios in a JSON string. The JSON string must contain the `ssl_mode` field.
enable_sql_audit	Whether to enable the SQL audit feature.

Parameter	Description
backup_backup_dest	The destination for backup data.
backup_backup_dest_option	The parameters for backup backup.
backup_dest_option	The parameters for backup.
backup_concurrency	The number of concurrent writes to the file system during backup.
backup_dest	The path for baseline backup and log archiving.
backup_log_archive_option	The options for archiving backup logs.
backup_net_limit	The total bandwidth for cluster backup.
backup_recovery_window	The time window for restoring backup data.
backup_region	The region for executing backup.
backup_zone	The zone for executing backup.
log_archive_batch_buffer_limit	The maximum memory usage for log archiving on a single node.
log_archive_checkpoint_interval	The time interval for cold data log archiving checkpoints.
restore_concurrency	The maximum concurrency for restoring tenant data from backup.

Parameter	Description
enable_cgroup	Whether to enable the cgroup feature for OBServer nodes.

Parameter	Description
cpu_count	Specifies the total number of CPU cores. If you set this parameter to 0, the system automatically detects the number of CPU cores.
server_balance_cpu_mem_tolerance_percent	Specifies the tolerance for CPU and memory resource imbalance in the node load balancing strategy.
server_cpu_quota_max	Specifies the maximum CPU quota that the system can use.
server_cpu_quota_min	Specifies the minimum CPU quota that the system can use. The system automatically reserves this quota.
token_reserved_percentage	Specifies the percentage of idle tokens to be reserved for tenants in tenant CPU scheduling.
workers_per_cpu_quota	Specifies the number of worker threads allocated to each CPU quota.
cpu_reserved	Specifies the number of CPU cores reserved for the system. The remaining CPU cores are exclusively used by OceanBase Database.
sys_cpu_limit_trigger	Specifies the CPU utilization threshold. If the CPU utilization exceeds this threshold, the system pauses the execution of background tasks.
system_cpu_quota	Specifies the CPU quota available to the system tenant.
tenant_cpu_variation_per_server	Specifies the allowed deviation in CPU quota scheduling among multiple units of a tenant.

Parameter	Description
weak_read_version_refresh_interval	Specifies the refresh cycle of the weak-consistency read version number, which affects the latency of weak-consistency read data.
large_query_worker_percentage	Specifies the percentage of worker threads reserved for processing large queries.
large_query_threshold	Specifies the threshold for query execution time.
trace_log_slow_query_watermark	Specifies the query execution time threshold. If the query execution time exceeds this threshold, the query is considered a slow query, and the trace logs of slow queries are printed to the system log.

Parameter	Description
balancer_log_interval	Specifies the interval at which the threads of a disaster recovery task print statistical logs.
balancer_task_timeout	Specifies the timeout period for background tasks such as load balancing.
balancer_tolerance_percentage	Specifies the tolerance for disk imbalance among multiple units of a tenant in the load balancing strategy. If the imbalance is within the tolerance range, no load balancing action is triggered.
server_balance_critical_disk_waterlevel	Specifies the water level for disk load balancing.
server_balance_disk_tolerance_percent	Specifies the tolerance for disk imbalance in the load balancing strategy.
resource_hard_limit	Specifies the over-subscription percentage for CPU resources.
enable_sys_unit_standalone	Specifies whether to enable the exclusive node for the system tenant.
balancer_emergency_percentage	Specifies the unit load threshold. When the unit load exceeds this threshold, replicas can be migrated even during major compactions.
balancer_timeout_check_interval	Specifies the interval at which to check for timeouts in background tasks such as load balancing.
data_copy_concurrency	Specifies the maximum number of concurrent data migration and replication tasks.
tenant_groups	Specifies the tenant groups used in the load balancing strategy.
unit_balance_resource_weight	Specifies the resource weights used in the unit load balancing strategy. This parameter is not usually manually configured.
resource_soft_limit	Specifies whether to enable unit load balancing.

Parameter	Description
unit_gc_wait_time	Specifies the maximum wait time for unit garbage collection. If the wait time exceeds this maximum, garbage collection is forced.
enable_rereplication	Specifies whether to enable automatic migration and replication of log stream replicas.
ls_meta_table_check_interval	Specifies the check interval of the background thread for the DBA_OB_LS_LOCATIONS and CDB_OB_LS_LOCATIONS views.
sys_bkgd_migration_change_member_list_timeout	Specifies the timeout for changing the Paxos member group during replica migration.
sys_bkgd_migration_retry_num	Specifies the maximum number of retries for replica migration.
balance_blacklist_failure_threshold	Specifies the threshold for the number of consecutive failures of background tasks such as replica migration. If the number of consecutive failures exceeds this threshold, the task is added to the blacklist.
balance_blacklist_retry_interval	Specifies the retry interval for background tasks such as replica migration after they are added to the blacklist.
election_cpu_quota	Specifies the CPU quota allocated to background tasks related to replica election.
election_blacklist_interval	Specifies the time interval during which a failed leader cannot be selected again.
enable_auto_leader_switch	Specifies whether to enable automatic leader switching.
enable_smooth_leader_switch	Specifies whether to enable smooth leader switching.
global_index_build_single_replica_timeout	Specifies the timeout for building a global index on each replica.
get_leader_candidate_rpc_timeout	Specifies the timeout for internal requests to obtain leader candidates in automatic leader switching.
migrate_concurrency	Specifies the maximum number of concurrent internal data migrations.
rebuild_replica_data_lag_threshold	Specifies the threshold for the transaction log lag between a standby replica and the leader. If the lag exceeds this threshold, replica rebuilding is triggered.
server_data_copy_out_concurrency	Specifies the maximum number of concurrent data migrations out of a single node.
server_data_copy_in_concurrency	Specifies the maximum number of concurrent data migrations into a single node.
replica_safe_remove_time	Specifies the safe retention period for deleted replicas.

Parameter	Description
bf_cache_miss_count_threshold	Specifies the number of macroblock misses that triggers the creation of a Bloom filter cache.
bf_cache_priority	Specifies the priority of the Bloom filter cache.
cache_wash_threshold	Specifies the capacity threshold that triggers cache cleaning.
fuse_row_cache_priority	Specifies the priority of the fused row cache in the cache system.
user_row_cache_priority	Specifies the priority of the baseline data row cache in the cache system.
autoinc_cache_refresh_interval	Specifies the refresh interval of the auto-increment column cache.
plan_cache_evict_interval	Specifies the eviction interval of the execution plan cache.
index_block_cache_priority	Specifies the priority of the metadata index microblock cache.
opt_tab_stat_cache_priority	Specifies the priority of the statistics cache.
tablet_ls_cache_priority	Specifies the priority of the tablet mapping cache.
user_block_cache_priority	Specifies the priority of the data block cache in the cache system.
index_info_block_cache_priority	Specifies the priority of the block index in the cache system.
index_cache_priority	Specifies the priority of the index in the cache system.
user_tab_col_stat_cache_priority	Specifies the priority of the statistics cache in the cache system.
plan_cache_high_watermark	Specifies the memory usage threshold of the execution plan cache. If the memory usage exceeds this threshold, the cache is automatically evicted.
plan_cache_low_watermark	Specifies the memory usage threshold of the execution plan cache. If the memory usage is lower than this threshold, the cache is not evicted.

Parameter	Description
tablet_meta_table_check_interval	Specifies the interval at which the background thread for checking the DBA_OB_TABLET_REPLICAS and CDB_OB_TABLET_REPLICAS views performs checks.
tablet_meta_table_scan_batch_count	Specifies the number of tablets cached in memory by the tablet meta table iterator.
tablet_size	Specifies the size of each tablet during parallel processing (such as major compactions and queries) within a partition.
auto_broadcast_location_cache_rate_limit	Specifies the maximum number of partitions whose location information can be broadcasted per second by each OBServer node.
auto_refresh_location_cache_rate_limit	Specifies the maximum number of partitions whose location cache can be automatically refreshed per second by each OBServer node.
enable_pg	Specifies whether to enable the partition group feature.
gc_wait_archive	Specifies whether to wait for all logs of a partition to be archived before performing partition garbage collection.
partition_table_check_interval	Specifies the interval at which an OBServer node deletes non-existent replicas from a partition table.

Parameter	Description
sql_net_thread_count	Specifies the number of MySQL cluster I/O threads, that is, the number of `global_sql_nio_server` threads. The default value of 0 indicates that this parameter takes the value of the `net_thread_count` parameter.
auto_leader_switch_interval	Specifies the working interval of the background thread for automatic leader switching.
switchover_process_thread_count	Specifies the size of the thread pool for primary-standby database switching.

Parameter	Description
sync_io_thread_count	Specifies the number of threads for synchronous I/O requests.
syslog_io_bandwidth_limit	Specifies the maximum disk I/O bandwidth that can be occupied by system logs. System logs exceeding this bandwidth limit will be discarded.
disk_io_thread_count	Specifies the number of disk I/O threads. The value must be an even number.
net_thread_count	Specifies the number of network I/O threads.
data_storage_error_tolerance_time	Specifies the maximum tolerated time for the data disk to be in the `ERROR` state.
sys_bkgd_io_high_percentage	Specifies the maximum percentage of system background I/O resources that can be occupied.
sys_bkgd_io_low_percentage	Specifies the minimum percentage of system background I/O resources that must be occupied.
user_iort_up_percentage	Specifies the threshold of user disk I/O latency. If the user disk I/O latency exceeds this threshold, the system will throttle background I/O tasks.
ob_esi_rpc_port	Specifies the communication port between the obesi process and the observer process.
enable_ob_esi_process	Specifies whether to enable the obesi (External Storage Interface) process.
ob_esi_session_timeout	Specifies the timeout period for the obesi process to hold active session resources.
ob_esi_io_concurrency	Specifies the number of concurrent I/O operations for the obesi process.
ob_esi_syslog_level	Specifies the current log recording level for the obesi process.
ob_esi_max_syslog_file_count	Specifies the maximum number of log files that the obesi process can accommodate before recycling log files.
multiblock_read_gap_size	Specifies the maximum capacity of the block cache for a single I/O aggregation read.
multiblock_read_size	Specifies the size of I/O aggregation for data reads.

Parameter name	Description
all_server_list	Displays the addresses of all servers in the cluster.
cluster	Sets the name of the OceanBase cluster.
cluster_id	Sets the ID of the OceanBase cluster.
rpc_timeout	Sets the timeout period for internal cluster requests.
all_cluster_list	Displays the list of servers that access the same config_url.
enable_election_group	Sets whether to enable the election group policy.
local_ip	The IP address of the machine on which ObServer is installed.
observer_id	The unique identifier assigned to the OBServer node by the RS in the cluster.
min_observer_version	Displays the lowest application version of the OBServer nodes in the cluster.

Parameter name	Description
enable_ob_ratelimit	Enables rate limiting between regions in RPC connections.
ob_ratelimit_stat_period	Sets the time interval for the OBServer node to calculate and update the maximum bandwidth.

Parameter name	Description
virtual_table_location_cache_expire_time	Sets the expiration time for the location cache of virtual tables.
location_cache_refresh_rpc_timeout	The timeout period for refreshing the `location_cache` via RPC.
location_cache_refresh_sql_timeout	The timeout period for refreshing the `location_cache` via SQL.
location_cache_refresh_min_interval	Sets the minimum interval for refreshing the location cache to prevent excessive refresh requests from causing excessive system pressure.
location_cache_cpu_quota	Sets the CPU quota for the location cache module.
location_fetch_concurrency	Sets the maximum number of concurrent location cache refreshes on a single server.
location_refresh_thread_count	Sets the number of threads for the OBServer node to fetch partition location information from the Root Service.
enable_auto_refresh_location_cache	Sets whether to enable the automatic refresh of location cache information.

Parameter name	Description
config_additional_dir	Specifies multiple directories for storing local configuration files for redundancy.
data_dir	Specifies the directory for storing data such as SSTables.

Parameter	Description
datafile_disk_percentage	The percentage of the total space of the disk where the data_dir is located. OceanBase Database will initialize this disk for storing data.
data_disk_usage_limit_percentage	The maximum percentage of the disk space that can be used for data files. If the usage exceeds this threshold, data migration is prohibited.
enable_sql_operator_dump	Specifies whether to allow intermediate results of SQL processing to be written to disk to release memory.
global_write_halt_residual_memory	The global threshold for remaining memory that triggers a pause in writes for normal tenants (`sys` tenant is unaffected).
leak_mod_to_check	Used for internal debugging to check for memory leaks.
memory_chunk_cache_size	The size of memory blocks cached by the memory allocator.
memory_limit	The total available memory size.
memory_limit_percentage	The percentage of the total available memory size relative to the total memory size.
memory_reserved	The memory reserved for KVCache.
memstore_limit_percentage	The percentage of the tenant's total available memory used by MemStore.
system_memory	The memory reserved for the tenant with ID `500`.
use_large_pages	Manages the use of large pages for database memory.
datafile_maxsize	The maximum size to which disk files can automatically expand.
datafile_next	The incremental step for automatic expansion of disk files.
storage_meta_cache_priority	Controls the priority of storage Meta Cache in KVCache.

Parameter name	Description
px_workers_per_cpu_quota	Specifies the ratio of parallel execution worker threads.
px_task_size	Specifies the amount of data processed by each task of the SQL parallel query engine.
max_px_worker_count	Specifies the maximum number of threads used by the SQL parallel query engine.

Parameter name	Description
builtin_db_data_verify_cycle	Specifies the cycle for data block verification. The unit is days. If the value is 0, no verification is performed.
data_storage_warning_tolerance_time	Specifies the tolerance time for the data disk status to be set to WARNING.
dead_socket_detection_timeout	Specifies the interval for detecting a failed socket.
migration_disable_time	Specifies the duration for which data migration is paused when data migration to a node fails due to reasons such as a full disk.
schema_history_expire_time	Specifies the expiration time for metadata history data.
datafile_size	Specifies the size of the data file. This parameter is usually not set.
devname	Specifies the name of the network interface card (NIC) to which the service process is bound.
enable_perf_event	Specifies whether to enable the collection of performance event information.
enable_record_trace_id	Specifies whether to record the trace ID set by the application.
enable_upgrade_mode	Specifies whether to enable upgrade mode. In upgrade mode, some system background features are paused.
enable_ddl	Specifies whether to allow DDL operations.
high_priority_net_thread_count	Specifies the number of high-priority network threads. A value of `0` indicates that this feature is disabled.
obconfig_url	Specifies the URL address of the OBConfig service.
rpc_port	Specifies the port number for remote access.
stack_size	The size of the program function call stack.
tenant_task_queue_size	The size of the request queue for each tenant.
zone	The name of the zone where the node resides. This parameter is usually not configured.
recyclebin_object_expire_time	The time when the schema objects in the recycle bin are automatically purged.
default_row_format	The default row format used when creating tables in MySQL-compatible mode.
sys_bkgd_net_percentage	The percentage of network bandwidth that can be occupied by background system tasks.
schema_history_recycle_interval	The interval between the execution of `schema` multi-version record recycling tasks.
enable_asan_for_memory_context	When ob_asan is used, this parameter specifies whether to allow ObAsanAllocator (the default ObAllocator) as the memory context allocator.
ofs_list	The connection URLs of OceanBase File System (OFS), which is an OceanBase Database-designed distributed storage system, for each zone. This parameter is mainly used to meet the needs of RootService for cross-zone file access in OFS deployment mode.
async_ps_cursor_max_count	The maximum number of asynchronous PS cursors in a single node.

Parameter name	Description
enable_logservice	Controls the log service mode.
logservice_access_point	Specifies the log service access point.

Parameter name	Description
rootservice_async_task_queue_size	Specifies the size of the internal asynchronous task queue of the Root Service.
rootservice_async_task_thread_count	Specifies the size of the thread pool used for internal asynchronous tasks of the Root Service.
rootservice_list	Displays the list of Root Service nodes and their replicas.
rootservice_ready_check_interval	Specifies the interval between the Root Service startup and the check of the cluster status.
rootservice_memory_limit	Specifies the maximum memory capacity limit of the Root Service.
lease_time	Specifies the lease time of the heartbeat.
server_check_interval	Specifies the interval between server table consistency checks.
server_permanent_offline_time	Specifies the threshold for node heartbeat interruption. After the heartbeat is interrupted for this duration, the node is considered permanently offline, and data replicas on permanently offline nodes need to be automatically replenished.
ob_event_history_recycle_interval	Specifies the interval for recycling historical events.
enable_rootservice_standalone	Specifies whether to dedicate OBServer nodes to the system tenant and RootService.
fast_recovery_concurrency	Specifies the number of concurrent fast recovery tasks scheduled by the RootService on OBServer nodes.
wait_leader_batch_count	Specifies the maximum number of partitions to be switched at a time by the RootService.

Parameter name	Description
rpc_client_authentication_method	Specifies the security authentication method for RPC clients.
rpc_server_authentication_method	Specifies the security authentication method for RPC servers.

Parameter	Description
sql_login_thread_count	The number of threads for processing SQL login requests.
sql_audit_memory_limit	The maximum memory that can be occupied by SQL audit data.
enable_sys_table_ddl	Specifies whether to allow manual creation of system tables.
internal_sql_execute_timeout	The time interval for system internal DML requests.

Parameter	Description
log_disk_size	Specifies the size of the redo log disk.
log_disk_percentage	Specifies the percentage of the total space occupied by redo logs on the disk.
dtl_buffer_size	Specifies the size of the cache used by the SQL data transfer module.
ignore_replay_checksum_error	Specifies whether to ignore checksum errors that occur during transaction log replay.
trx_2pc_retry_interval	Specifies the time interval for automatic retries when two-phase commit fails.
standby_fetch_log_bandwidth_limit	Specifies the maximum bandwidth that can be occupied per second by the total amount of data synchronization traffic from all servers in the standby tenant cluster to the primary tenant.
log_storage_warning_tolerance_time	Specifies the time from when a log disk I/O failure occurs to when the disk is marked as a bad disk.
clog_disk_utilization_threshold	Controls the water level for reusing clog or ilog disk space.
clog_expire_days	Controls the expiration time of Clog files. When the last modification time of a Clog file exceeds the expiration time, the file is deleted.
clog_cache_priority	Specifies the priority of transaction logs in the cache.
clog_disk_usage_limit_percentage	Specifies the maximum percentage of available disk space for transaction logs.
clog_sync_time_warn_threshold	Specifies the transaction log synchronization time threshold for generating a WARN log when the synchronization time exceeds this threshold.
clog_transport_compress_func	Specifies the compression algorithm used for internal transaction log transmission.
enable_one_phase_commit	Specifies whether to enable the one-phase commit optimization feature.
enable_separate_sys_clog	Specifies whether to store system transaction logs separately from user transaction logs.
flush_log_at_trx_commit	Specifies the transaction log writing strategy during transaction commit.
ignore_replay_checksum_error	Specifies whether to ignore checksum errors that occur during transaction log replay.
index_clog_cache_priority	Specifies the priority of transaction log indexes in the cache system.
ilog_index_expire_time	Specifies the maximum time for which an OBServer can provide Ilog files for reading.
trx_force_kill_threshold	Specifies the maximum waiting time when a transaction must be killed due to freezing or switchover.

Parameter	Description
trx_try_wait_lock_timeout	Specifies the maximum wait time for row locks during statement execution.

Parameter name	Description
debug_sync_timeout	Enables the Debug Sync feature and sets its timeout.
enable_rich_error_msg	Specifies whether to add server address, time, trace ID, and other debugging information to client messages.

Parameter name	Description
enable_tcp_keepalive	Enables or disables the keepalive mechanism for client connections.
tcp_keepidle	Specifies the time, in seconds, after which a keepalive probe is sent to a client connection if no data is sent.
tcp_keepintvl	Specifies the time, in seconds, between two consecutive keepalive probes.
tcp_keepcnt	Specifies the maximum number of retries before a non-active connection is closed.

Parameter name	Description
external_table_disk_cache_max_percentage	Specifies the maximum proportion of datafile_size that can be used for disk caching of external tables in SN mode.

Parameter	Description
alert_log_level	Specifies the level of alert logs.
enable_record_trace_log	Specifies whether to record trace logs.
enable_async_syslog	Specifies whether to enable asynchronous system log writing.
enable_syslog_recycle	Specifies whether to record logs generated before the OBServer node starts. This parameter is used in conjunction with `max_syslog_file_count` to determine whether to consider old log files during the recycling process.
enable_syslog_wf	Specifies whether to print system logs of WARN and higher levels to a separate log file.
max_string_print_length	Specifies the maximum length of a single line of system logs.
max_syslog_file_count	Specifies the maximum number of log files that can be retained before recycling.
syslog_level	Specifies the level of system logs.
trace_log_sampling_interval	Specifies the interval at which trace logs are printed periodically.
diag_syslog_per_error_limit	Specifies the maximum number of DIAG system logs that can be printed per second for each error code. If this threshold is exceeded, logs will no longer be printed.
enable_log_archive	Specifies whether to enable the log archiving feature.
system_trace_level	Specifies the log printing level for system trace logs.

Parameter	Description
default_compress_func	Specifies the default compression algorithm for table data. You can also specify a different compression algorithm when creating a table.
default_compress	Specifies the default compression strategy used when creating tables in Oracle-compatible mode.
tableapi_transport_compress_func	Specifies the compression algorithm used for transmitting query results in OBKV-Table.
default_transport_compress_func	Specifies the RPC compression algorithm for the entire cluster.

Parameter name	Description
enable_major_freeze	Specifies whether to enable automatic global freezing.
micro_block_merge_verify_level	Specifies the verification level for macroblocks during major compactions.
row_compaction_update_limit	Specifies the number of modifications required to trigger an in-memory row compaction.
enable_global_freeze_trigger	Specifies whether to enable automatic global freezing.
enable_merge_by_turn	Specifies whether to enable the round-robin merge strategy.
enable_manual_merge	Specifies whether to enable manual compactions.
global_major_freeze_residual_memory	Specifies the threshold for residual memory that triggers a global freeze. In other words, a global freeze is triggered when the residual memory is less than this percentage.
minor_deferred_gc_time	Specifies the interval for delayed garbage collection of SSTables after a minor compaction.
zone_merge_concurrency	Specifies the maximum number of zones that can be merged concurrently. If the value is 0, the system automatically selects the optimal concurrency level based on deployment.
zone_merge_order	Specifies the order for round-robin zone merges. If not specified, the system automatically determines the order.
zone_merge_timeout	Specifies the timeout for merging a single zone.
minor_freeze_times	Specifies the number of minor freezes required to trigger a minor compaction.
minor_merge_concurrency	Specifies the number of concurrent threads for minor compactions.
minor_warm_up_duration_time	Specifies the warm-up time for generating new minor compaction files.
row_purge_thread_count	Specifies the maximum number of worker threads for in-memory row compactions.

Parameter name	Description
arbitration_degradation_policy	Specifies the degradation strategy.
ob_startup_mode	Specifies the startup mode for an OBServer node. This parameter can be modified only during the first startup.

Parameter name	Description
clog_io_isolation_mode	Specifies whether to isolate I/O requests for the clog disk based on whether the clog disk and data disk are independent.
enable_global_background_resource_isolation	Specifies whether to enable global foreground and background resource isolation.
global_background_cpu_quota	Specifies the CPU quota for background tasks when global foreground and background resource isolation is enabled.

Parameter name	Description
sts_credential	Specifies the credentials for accessing the STS service provided by OCP.
external_kms_info	Stores some key management information.
tde_method	Specifies the method for transparent tablespace encryption.
audit_sys_operations	Specifies whether to track the operations of system users.
audit_trail	Specifies whether to enable database auditing.

Parameter name	Description
default_table_organization	Specifies the default table organization mode for tables.
default_table_merge_engine	Specifies the default `merge_engine` for tables in a user tenant.

Parameter name	Description
cpu_quota_concurrency	Specifies the maximum number of concurrent sessions allowed for each CPU quota of a tenant.

Parameter name	Description
enable_monotonic_weak_read	Specifies whether to enable monotonic weak reads.
query_response_time_stats	Specifies whether to enable statistics collection for the `information_schema.QUERY_RESPONSE_TIME` view.
query_response_time_flush	Specifies whether to refresh the `information_schema.QUERY_RESPONSE_TIME` view and read the `query_response_time_range_base` parameter again.
query_response_time_range_base	Specifies the interval for collecting time parameters in the `information_schema.QUERY_RESPONSE_TIME` view.

Parameter	Description
enable_ls_leader_balance	Specifies whether to enable automatic load balancing for log stream leaders.
enable_gts_standalone	Specifies whether to enable the GTS service to occupy a dedicated group of units.
balancer_idle_time	The wake-up interval for background task threads, such as the load balancer, when they are idle.
enable_rebalance	Specifies whether to enable automatic load balancing.
enable_transfer	Specifies whether to allow transfer within a tenant. If the `enable_rebalance` parameter is disabled, this parameter is invalid.
partition_balance_schedule_interval	The interval for partition balance scheduling.
enable_database_sharding_none	Specifies whether to enable automatic aggregation when a user table is created in a database.

Parameter	Description
replica_parallel_migration_mode	The mode for log stream replica parallel migration.
choose_migration_source_policy	The priority policy for selecting the source replica for migration.

Parameter	Description
ls_scale_out_factor	The scaling-out factor for log streams. This parameter specifies the number of log streams per service node.

Parameter	Description
recover_table_concurrency	The maximum number of tables that can be restored in parallel in the cross-tenant data import phase of table-level restore.
recover_table_dop	The maximum number of tables that can be restored in parallel in the cross-tenant data import phase of table-level restore.
log_restore_concurrency	The concurrency level for log restore.
log_archive_concurrency	The concurrency level for log archiving.
backup_data_file_size	The maximum size of a single data backup file.

Parameter	Description
enable_auto_split	Specifies whether to enable automatic partitioning for the tenant.
auto_split_tablet_size	Specifies the threshold for triggering automatic partitioning for the tenant.
global_index_auto_split_policy	Specifies whether to enable automatic partitioning for new global indexes. The default value is `DISTRIBUTED`.

Parameter	Description
attach_shared_sstable_thread_score	Specifies the number of threads available for the tenant to execute shared data reference tasks in shared storage mode.
inc_sstable_upload_thread_score	Specifies the number of threads available for the tenant to execute data sharing tasks in shared storage mode.
ddl_thread_score	Specifies the number of threads used for DDL tasks.
compaction_low_thread_score	Specifies the number of worker threads for low-priority major compactions.
compaction_high_thread_score	Specifies the number of worker threads for high-priority major compactions.
compaction_mid_thread_score	Specifies the number of worker threads for medium-priority major compactions.
ha_high_thread_score	Specifies the current number of worker threads for high-priority high-availability threads.
ha_mid_thread_score	Specifies the current number of worker threads for medium-priority high-availability threads.
ha_low_thread_score	Specifies the current number of worker threads for low-priority high-availability threads.
ob_compaction_schedule_interval	Specifies the time interval for scheduling major compactions.
compaction_dag_cnt_limit	Specifies the maximum number of DAGs in the Compaction DAG queue.
compaction_schedule_tablet_batch_cnt	Specifies the maximum number of partitions to be scheduled in each batch during major compaction scheduling.
tenant_sql_login_thread_count	Specifies the number of threads for MySQL-compatible tenant login, i.e., the number of `mysql_queue` threads. The default value of 0 indicates that the value of `unit_min_cpu` is used.
tenant_sql_net_thread_count	Specifies the number of I/O threads for MySQL-compatible tenants, i.e., the number of `sql_nio_server` threads. The default value of 0 indicates that the value of `unit_min_cpu` is used.

Parameter name	Description
default_storage_cache_policy	Configures the default cache policy.
enable_manual_storage_cache_policy	Enables the user-defined hot cache policy.
suspend_storage_cache_task	Specifies whether to suspend the background cache task.
enable_adaptive_plan_cache	Controls whether to enable the adaptive plan cache feature for a tenant.
result_cache_max_size	Controls the maximum amount of memory that can be used by the `result cache` module.
result_cache_max_result	Controls the maximum proportion of `result_cache_max_size` that can be used by a single `result cache` cache object.
ob_result_cache_evict_percentage	Specifies the memory evict threshold for `result cache`.
ob_deterministic_udf_cache_max_size	Specifies the maximum amount of memory that can be used by the cache pool for all `deterministic` UDFs during statement execution.

Parameter name	Description
io_category_config	Configures the percentage of I/O requests for each category.

Parameter name	Description
enable_sql_extension	Specifies whether to enable the SQL extension feature for a tenant.
compatible	Controls the compatibility behavior of related features for a tenant. This parameter cannot be set.

Parameter name	Description
ob_proxy_readonly_transaction_routing_policy	Controls whether Proxy routing for transactions is affected by read-only statements.

Parameter name	Description
lob_enable_block_cache_threshold	Specifies the threshold for LOB query caching in OUTROW storage.

Parameter name	Description
temporary_file_max_disk_size	Sets the maximum disk space that can be occupied by temporary files on a single node of the tenant.
ob_vector_memory_limit_percentage	Configures the threshold for memory resource usage of the vector index module (unit: percentage).
range_optimizer_max_mem_size	Limits the memory used by the Query Range module.
rpc_memory_limit_percentage	Sets the maximum memory for RPC in the tenant, as a percentage of the total tenant memory.
query_memory_limit_percentage	Specifies the percentage of tenant memory available for a single SQL statement.

Parameter name	Description
temporary_file_max_disk_size	Sets the maximum disk space that can be occupied by temporary files on a single node of the tenant.

Parameter name	Description
enable_kv_ttl	Controls whether to start the TTL background task. This parameter is effective for periodic TTL tasks, but not for user-controlled commands.Notice: The TTL feature is only applicable to OceanBase KV scenarios and is disabled in SQL scenarios to prevent unexpected data deletion.
kv_ttl_duty_duration	Sets the trigger period for daily scheduled TTL tasks. The TTL task will be triggered once during this period.
kv_group_commit_batch_size	Specifies the size of batch operations executed in OBKV group commit.
kv_group_commit_rw_mode	Controls scenarios where group commit is used.
kv_hbase_client_scanner_timeout_period	Sets the timeout period for OBKV-HBase streaming queries.
kv_ttl_history_recycle_interval	Sets the duration for which TTL task history records are retained.
ttl_thread_score	Sets the number of worker threads used by TTL tasks.

Parameter name	Description
plsql_code_type	Specifies the compilation type for PL/SQL code.
plsql_debug	Specifies whether to compile into a debug version.
plsql_optimize_level	Specifies the compilation optimization level.
plsql_v2_compatibility	Controls whether to enable the feature of compiling and persisting DDL operations for stored procedures.
package_state_sync_max_size	Controls the maximum length that can be serialized for a single package state (package state management).
ob_enable_java_udf	Controls whether to enable the Java UDF feature.

Parameter	Description
default_load_mode	Specifies the data import mode in the data import scenario.
direct_load_allow_fallback	Specifies whether to fall back to the normal import mode when a direct load operation encounters a scenario that is not supported by direct load.
load_data_diagnosis_log_compression	Specifies the compression algorithm for diagnostic logs.
load_data_diagnosis_log_max_size	Specifies the size of a diagnostic log file.

Parameter	Description
zone_deploy_mode	Specifies the distribution mode of the tenant across zones.
enable_early_lock_release	Specifies whether to enable the early row lock release feature.
workarea_size_policy	Specifies the strategy for manually or automatically adjusting the size of the SQL workarea.
open_cursors	Specifies the maximum number of cursors that can be opened simultaneously in a single session.
ob_ssl_invited_common_names	Records the list of application identities for the current tenant. The identities are obtained from the `cn` field of the `subject` in the client certificate during SSL mutual authentication.
ob_enable_batched_multi_statement	Specifies whether to enable the batch execution optimization for the batch processing feature.
job_queue_processes	Specifies the maximum number of concurrent tasks that can run on each tenant to prevent tasks from consuming excessive tenant resources.
default_auto_increment_mode	Specifies the default auto-increment mode for auto-increment columns.
ob_query_switch_leader_retry_timeout	Specifies the maximum retry time for a failed query, in microseconds (us).
default_enable_extended_rowid	Specifies whether to create a table in the Extended ROWID mode.
dump_data_dictionary_to_log_interval	Specifies the persistence cycle of the tenant data dictionary.
enable_user_defined_rewrite_rules	Specifies whether to enable user-defined rewrite rules.
storage_rowsets_size	Specifies the number of rows vectorized in one batch for the columnar engine.
approx_count_distinct_precision	Specifies the precision of the result of the `approx_count_distinct` function.
default_skip_index_level	Specifies the mechanism for generating Skip Indexes for incremental SSTables in the tenant.

Parameter	Description
log_disk_utilization_limit_threshold	Specifies the threshold for the utilization of the log disk space of a tenant. When the log disk usage of a tenant exceeds the total log disk space of the tenant multiplied by this threshold, log writes are no longer allowed.
log_disk_utilization_threshold	Specifies the threshold for the utilization of the log disk space of a tenant. When the log disk usage of a tenant exceeds the total log disk space of the tenant multiplied by this threshold, log files are reused.
writing_throttling_maximum_duration	Controls the write speed by controlling the memory allocation progress. That is, specifies the time required to allocate the remaining MemStore memory after write throttling is triggered.
writing_throttling_trigger_percentage	Specifies the threshold for the write speed.
standby_db_fetch_log_rpc_timeout	Specifies the timeout period for the RPC call for log fetching from a standby database, which is used to control the log transmission service of the standby database to detect the unavailability of a server in the primary database and switch to another server.
log_disk_throttling_percentage	Specifies the percentage of the log disk space that cannot be reclaimed when write throttling is triggered.
log_transport_compress_all	Specifies whether to enable compression for log transmission.
log_transport_compress_func	Specifies the compressor for log transmission.
clog_max_unconfirmed_log_count	Specifies the maximum number of unconfirmed logs in the transaction module.
clog_persistence_compress_func	Specifies the compression algorithm for transaction log persistence.
enable_clog_persistence_compress	Specifies whether to enable transaction log persistence compression.

Parameter	Description
json_document_max_depth	Specifies the maximum nesting level allowed in a JSON document.

Parameter	Description
enable_lock_priority	Lock priority switch.

Parameter	Description
external_table_io_hole_size	Specifies the maximum distance (in bytes) between two consecutive IO ranges.
external_table_io_range_size	Specifies the maximum size (in bytes) of a major compaction range.

Parameter	Description
log_disk_throttling_maximum_duration	Specifies the maximum available time for the log disk after write throttling is triggered.
ls_gc_delay_time	Specifies the delay time for log deletion.
standby_db_preferred_upstream_log_region	Specifies the preferred region for log synchronization from the upstream database in a physical standby database scenario.
archive_lag_target	Specifies the delay time for log archiving.

Parameter	Description
enable_mlog_auto_maintenance	Specifies whether to enable the automatic management of materialized view logs.
mlog_trim_interval	Specifies the scheduling cycle of the background automatic trimming task for materialized view logs (mlogs).
enable_mv_binlog_minimal_mode	Specifies whether to enable the `binlog minimal` mode in the incremental refresh scenario of materialized views.

Parameter	Description
connection_control_failed_connections_threshold	Specifies the threshold for failed login attempts.
connection_control_min_connection_delay	Specifies the minimum lock duration after exceeding the threshold for failed login attempts.
connection_control_max_connection_delay	Specifies the maximum lock duration for failed login attempts. The lock duration does not increase after reaching this maximum value.

Parameter	Description
spill_compression_codec	Specifies the compression algorithm type for data disk-offloading compression during SQL execution.
ob_encoding_granularity	Specifies the maximum number of rows in a microblock encoding.

Parameter	Description
mds_minor_compact_trigger	Specifies the number of SSTables that triggers MDS minor compaction.
mds_compaction_mid_thread_score	Specifies the number of DAG (direct acyclic graph) threads for MDS compaction with medium priority.
mds_compaction_high_thread_score	Specifies the number of DAG (direct acyclic graph) threads for MDS compaction with high priority.
default_progressive_merge_num	Specifies the default number of progressive major compactions for a new table.
major_freeze_duty_time	Specifies the time at which the system triggers major compaction and major freeze.
major_compact_trigger	Specifies the number of major freezes that triggers a major compaction.
minor_compact_trigger	Specifies the number of SSTables that triggers minor compaction.
undo_retention	Specifies the range of versions of data to be retained in the system. The unit is seconds. During minor compaction, the system recycles the versions of data in the specified range.
merger_check_interval	Specifies the interval at which the system checks the status of major compaction.
freeze_trigger_percentage	Specifies the memory usage threshold of a tenant that triggers global major freeze.
max_kept_major_version_number	Specifies the number of major freeze versions to be retained.
merge_stat_sampling_ratio	Specifies the sampling ratio of column statistics during major compaction.
merge_thread_count	Specifies the number of threads for daily major compaction.
merger_completion_percentage	Specifies the percentage of replicas to be completed for major compaction. If this threshold is reached, the current major compaction is considered completed.
merger_switch_leader_duration_time	Specifies the interval at which the system switches leaders during daily major compaction.
merger_warm_up_duration_time	Specifies the warm-up time for the new baseline data during major compaction.

Parameter	Description
arbitration_timeout	Specifies the timeout period for automatic downgrade.

Parameter	Description
sql_work_area	Specifies the tenant working memory.
max_stale_time_for_weak_consistency	Specifies the maximum number of versions of data that can be read in a weakly consistent read.

Overview

Cluster-level parameters

Security

Backup and restore

cgroup

Load balancing

Others

Log service

Root Service

RPC authentication

Debugging

TCP

External tables

Dumps and major compactions

Arbitration service

Resource isolation

Tenant-level parameters

Security

Storage

CPU

Read/write/query

Load balancing

Replica

Scaling

Backup and restore

Partitioning

Background execution threads

Note

Other parameters

Materialized views

Note

Compression algorithms

Dump and major compaction

Arbitration service

Unsupported parameters

Overview

Cluster-level parameters

Security

Backup and restore

cgroup

CPU-related

Read/write and query-related

Load balancing

Replica-related

Cache-related parameters

Partition-related parameters

Background thread-related parameters

IO-related

Cluster-related

Bandwidth-related

Location Cache-related

Directory path-related parameters

Memory-related

PX-related parameters

Others

Log service

Root Service

RPC authentication

SQL related

Transaction and transaction log related

Lock related

Debugging

TCP

External tables

System log-related

Compression algorithm-related

Dumps and major compactions

Arbitration service

Resource isolation

Tenant-level parameters

Security

Storage

CPU

Read/write/query

Load balancing

Replica

Scaling

Backup and restore

Partitioning

Background execution threads

Cache-related

I/O-related

Compatibility-related

Note

Routing-related

LOB data-related

Memory space related

Disk space related

OBKV related

PL related

Parameters related to direct load

Other parameters

Transaction and transaction log related

Data type related

Lock related

External table related

System log related

Materialized views

User login

Note

Compression algorithms

Dump and major compaction

Arbitration service

Unsupported parameters