Overview of parameters|V4.3.5| docs|Distributed Database

Parameter	Description
mysql_port	The port number for the SQL service protocol.
rpc_port	The port number for remote access.
sql_protocol_min_tls_version	The minimum version of the SSL/TLS protocol for SSL connections to the database.
ssl_client_authentication	Whether to enable the SSL connection feature.
ssl_external_kms_info	The information required for the SSL feature of OceanBase Database. The information is stored in a JSON string that contains at least 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 log archiving.
backup_net_limit	The total bandwidth for cluster backup.
backup_recovery_window	The time window for restoring backup data.
backup_region	The region for backup.
backup_zone	The zone for backup.
log_archive_batch_buffer_limit	The maximum memory usage for log archiving.
log_archive_checkpoint_interval	The interval between checkpoints for cold data log archiving.
restore_concurrency	The maximum number of concurrent threads for restoring tenant data from backup.

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

Parameter name	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 available to the system.
server_cpu_quota_min	Specifies the minimum CPU quota available to the system. The system automatically reserves some CPU cores.
token_reserved_percentage	Specifies the percentage of idle tokens reserved for each tenant in the CPU scheduling of a tenant.
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. When 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 between multiple units of a tenant.

Parameter name	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 large queries.
large_query_threshold	Specifies the query execution time threshold.
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 log of the slow query is printed to the system log.

Parameter	Description
balancer_log_interval	The interval at which the threads of disaster recovery tasks print statistical logs.
balancer_task_timeout	The timeout for background tasks such as load balancing.
balancer_tolerance_percentage	The tolerance for disk imbalance between multiple Units of a tenant in the load balancing strategy. If the imbalance is within the mean ± tolerance range, no balancing action is triggered.
server_balance_critical_disk_waterlevel	The water level for disk space load balancing.
server_balance_disk_tolerance_percent	The tolerance for disk imbalance in the load balancing strategy between nodes.
resource_hard_limit	The oversubscription percentage for CPU resources.
enable_sys_unit_standalone	Whether to enable exclusive node mode for the system tenant.
balancer_emergency_percentage	The load threshold for a Unit. If the load exceeds this threshold, replica migration is allowed, even during major compactions.
balancer_timeout_check_interval	The interval at which to check for timeouts in background tasks such as load balancing.
data_copy_concurrency	The maximum number of concurrent data migration and replication tasks in the system.
tenant_groups	The tenant groups used in the load balancing strategy.
unit_balance_resource_weight	The resource weights used in the Unit balancing strategy. Generally, no manual configuration is required.
resource_soft_limit	Whether to enable Unit balancing.

Parameter	Description
unit_gc_wait_time	The maximum wait time for unit garbage collection. If the wait time exceeds this value, garbage collection is forcibly triggered.
enable_rereplication	Enables or disables automatic migration and replication of log stream replicas.
ls_meta_table_check_interval	Specifies the interval at which the background thread checks 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 failures.
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 interval during which a removed leader cannot be elected again.
enable_auto_leader_switch	Specifies whether to enable automatic leader switching.
enable_smooth_leader_switch	Enables or disables 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 during automatic leader switching.
migrate_concurrency	Specifies the maximum number of concurrent internal data migrations.
rebuild_replica_data_lag_threshold	Specifies the threshold for the gap between the transaction logs of the standby replica and the leader. If the gap exceeds this threshold, replica rebuilding is triggered.
server_data_copy_out_concurrency	Specifies the maximum number of concurrent data migrations from a single node.
server_data_copy_in_concurrency	Specifies the maximum number of concurrent data migrations to 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 threshold of memory occupied by the execution plan cache. If this threshold is exceeded, the cache is automatically evicted.
plan_cache_low_watermark	Specifies the threshold of memory occupied by the execution plan cache. Eviction stops when the value is below this threshold.

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 is executed.
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 on each OBServer node.
auto_refresh_location_cache_rate_limit	Specifies the maximum number of partitions whose location information can be automatically refreshed per second on 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 garbage collecting the partition.
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 the value of this parameter is the same as that of the `net_thread_count` parameter.
auto_leader_switch_interval	Specifies the interval at which the background thread for automatic leader switching is executed.
switchover_process_thread_count	Specifies the size of the thread pool for primary-standby switchover.

Parameter	Description
sync_io_thread_count	The number of threads for synchronous I/O requests.
syslog_io_bandwidth_limit	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	The number of disk I/O threads. It must be an even number.
net_thread_count	The number of network I/O threads.
data_storage_error_tolerance_time	The maximum tolerated time for the data disk to be in the `ERROR` state.
sys_bkgd_io_high_percentage	The maximum percentage of system background I/O.
sys_bkgd_io_low_percentage	The minimum percentage of system background I/O.
user_iort_up_percentage	The threshold for user disk I/O latency. If the user disk I/O latency exceeds this threshold, system background I/O tasks will be throttled.
ob_esi_rpc_port	The communication port between the obesi process and the observer process.
enable_ob_esi_process	Whether to enable the obesi (external storage interface) process.
ob_esi_session_timeout	The timeout for active session resources held by the obesi process.
ob_esi_io_concurrency	The number of concurrent I/O operations for the obesi process.
ob_esi_syslog_level	The current log recording level for the obesi process.
ob_esi_max_syslog_file_count	The maximum number of log files that the obesi process can hold before recycling them.
multiblock_read_gap_size	The maximum capacity for a single I/O aggregation read block cache.
multiblock_read_size	The size of I/O aggregation for data reading.

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 strategy.
local_ip	The IP address of the server where the 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 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 cache of virtual table location information.
location_cache_refresh_rpc_timeout	The timeout period for refreshing the `location_cache` through an RPC call.
location_cache_refresh_sql_timeout	The timeout period for refreshing the `location_cache` through an SQL statement.
location_cache_refresh_min_interval	Sets the minimum interval for location cache refresh requests 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 obtain partition location information from the Root Service.
enable_auto_refresh_location_cache	Sets whether to enable automatic refresh of location cache information.

Parameter name	Description
config_additional_dir	Specifies multiple directories for storing 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 occupied by the disk where the data_dir directory is located (the disk where the data_dir directory is located will be initialized by the OceanBase Database system for data storage).
data_disk_usage_limit_percentage	The maximum percentage of data files that can be written. If this threshold is exceeded, data migration is prohibited.
enable_sql_operator_dump	Specifies whether to allow the intermediate results of SQL processing to be written to disk to release memory.
global_write_halt_residual_memory	The global remaining memory threshold that triggers the suspension of write operations for ordinary tenants (the `sys` tenant is not affected).
leak_mod_to_check	Used for memory leak checks. It is an internal debugging feature.
memory_chunk_cache_size	The size of the 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 size reserved for the KVCache.
memstore_limit_percentage	The percentage of memory used by the MemStore relative to the total available memory for the tenant.
system_memory	The memory size reserved for the tenant with tenant ID `500`.
use_large_pages	Manages the use of large pages for database memory.
datafile_maxsize	The maximum size for automatic disk file expansion.
datafile_next	The increment step for automatic disk file expansion.
storage_meta_cache_priority	Controls the priority of the storage Meta Cache in the KVCache.

Parameter name	Description
px_workers_per_cpu_quota	Specifies the ratio of parallel execution worker threads.
px_task_size	Specifies the size 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 checking data block errors. The unit is days. If the value is 0, no check is performed.
data_storage_warning_tolerance_time	Specifies the tolerance time for the data disk status being 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 a full disk.
schema_history_expire_time	Specifies the expiration time of metadata history data.
datafile_size	Specifies the size of the data file. Generally, you do not need to set this parameter.
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 the execution of DDL operations.
high_priority_net_thread_count	Specifies the number of high-priority network threads. If the value is `0`, 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	Specifies the size of the program function call stack.
tenant_task_queue_size	Specifies the size of the request queue for each tenant.
zone	Specifies the name of the zone where the node is located. This parameter is usually not required.
recyclebin_object_expire_time	Automatically purges expired schema objects in the recycle bin.
default_row_format	Specifies the default row format used when creating tables in MySQL mode.
sys_bkgd_net_percentage	Specifies the percentage of network bandwidth that can be occupied by background system tasks.
schema_history_recycle_interval	Specifies the time interval for the system to execute the `schema` multi-version record recycling task.
enable_asan_for_memory_context	When using ob_asan, specifies whether to allow ObAsanAllocator (default ObAllocator) as the memory context allocator.
ofs_list	Stores the connection URLs of OceanBase File System (OFS), an OceanBase Database-designed distributed storage system, for each zone. It is mainly used to meet the needs of RootService to access files across zones in OFS deployment mode.

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 internal asynchronous task thread pool of the Root Service.
rootservice_list	Displays the list of machines where the Root Service and its replicas are located.
rootservice_ready_check_interval	Specifies the interval between the time when the Root Service starts and the time when the cluster status is checked.
rootservice_memory_limit	Specifies the maximum memory capacity limit of the Root Service.
lease_time	Specifies the heartbeat lease time.
server_check_interval	Specifies the interval for checking the consistency of the Server table.
server_permanent_offline_time	Specifies the threshold for node heartbeat interruption, that is, the time after which a node is considered permanently offline. Data replicas on permanently offline nodes need to be automatically replenished.
ob_event_history_recycle_interval	Controls the interval for recycling historical events.
enable_rootservice_standalone	Specifies whether to allow the system tenant and RootService to exclusively use the OBServer node.
fast_recovery_concurrency	Controls the number of concurrent fast recovery tasks scheduled by the RootService on the OBServer.
wait_leader_batch_count	Specifies the maximum number of partitions that the RootService can send a leader switch command for each batch.

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 name	Description
sql_login_thread_count	Specifies the number of threads for processing SQL login requests.
sql_audit_memory_limit	Specifies 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	Specifies the interval for 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 the 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 during transaction log replay.
trx_2pc_retry_interval	Specifies the time interval for automatic retries after a two-phase commit fails.
standby_fetch_log_bandwidth_limit	Specifies the maximum bandwidth per second that can be occupied in total by all servers in the standby tenant cluster when pulling logs from 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 faulty and a leader switch is triggered.
clog_disk_utilization_threshold	Controls the water level for reusing clog or ilog disk space.
clog_expire_days	Specifies the expiration time of Clog files. If the last modification time of a Clog file is earlier than the current time by more than the expiration time, the file will be 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 threshold for transaction log synchronization time. A WARN log is generated 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 strategy for writing transaction logs during transaction commit.
ignore_replay_checksum_error	Specifies whether to ignore checksum errors 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 file reads.
trx_force_kill_threshold	Specifies the maximum waiting time for killing a transaction due to freezing or switchover.

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

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

Parameter	Description
enable_tcp_keepalive	Enables or disables the keepalive mechanism for client connections.
tcp_keepidle	Specifies the interval in seconds after which a keepalive probe is sent to a client connection that has been idle for the specified period.
tcp_keepintvl	Specifies the interval in seconds between consecutive keepalive probes for a client connection.
tcp_keepcnt	Specifies the maximum number of retries before closing an inactive client connection.

Parameter name	Description
alert_log_level	Specifies the level of the alert log.
enable_record_trace_log	Specifies whether to record trace logs.
enable_async_syslog	Specifies whether to enable asynchronous writing of system logs.
enable_syslog_recycle	Specifies whether to enable the option to record old logs before OBServer node startup. This option, when used with `max_syslog_file_count`, determines whether the recycling logic considers old log files.
enable_syslog_wf	Specifies whether to print system logs at the WARN level or higher to a separate log file.
max_string_print_length	Specifies the maximum length of a single line of system log.
max_syslog_file_count	Specifies the maximum number of log files that can be retained before recycling.
syslog_level	Specifies the level of the system log.
trace_log_sampling_interval	Specifies the interval for periodically printing trace log information.
diag_syslog_per_error_limit	Specifies the maximum number of DIAG system logs allowed per second per error code. Logs exceeding this threshold will not 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 name	Description
default_compress_func	Specifies the default compression algorithm for table data, which can also be specified when creating a table.
default_compress	Specifies the default compression strategy used when creating a table in Oracle 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 the automatic global freeze feature.
micro_block_merge_verify_level	Specifies the verification level for macroblocks during compaction.
row_compaction_update_limit	Specifies the number of modifications that trigger in-memory row data compaction.
enable_global_freeze_trigger	Specifies whether to enable automatic global freeze triggering.
enable_merge_by_turn	Specifies whether to enable the round-robin merge strategy.
enable_manual_merge	Specifies whether to enable manual compaction.
global_major_freeze_residual_memory	Specifies the threshold for residual memory to trigger a global freeze. That is, a global freeze is triggered when the residual memory is less than this percentage.
minor_deferred_gc_time	Specifies the interval between the end of a compaction and the start of SSTable garbage collection.
zone_merge_concurrency	Specifies the 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 of zones for round-robin compaction. 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 freezes that trigger a compaction.
minor_merge_concurrency	Specifies the number of threads for compaction.
minor_warm_up_duration_time	Specifies the preheating time for generating new dump files.
row_purge_thread_count	Specifies the maximum number of threads for in-memory row data compaction.

Parameter name	Description
arbitration_degradation_policy	Specifies the auto-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 created by user tenants. Note For OceanBase Database V4.3.5, this parameter is available starting with V4.3.5 BP3.

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

Parameter name	Description
enable_monotonic_weak_read	Specifies whether to enable monotonic 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 re-read `query_response_time_range_base`.
query_response_time_range_base	Specifies the interval for collecting time parameters in the `information_schema.QUERY_RESPONSE_TIME` view.

Parameter	Description
unit_gc_wait_time	The maximum wait time for unit garbage collection. If the wait time exceeds the maximum, garbage collection is forced.
balancer_idle_time	The time interval for waking up idle threads of background tasks such as load balancing.
enable_rebalance	Specifies whether to enable automatic load balancing.
enable_transfer	Specifies whether to allow data transfer within a tenant. This parameter is invalid when the `enable_rebalance` parameter is disabled.
partition_balance_schedule_interval	The interval for partition balancing scheduling.

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

Parameter	Description
recover_table_concurrency	The maximum number of tables that can be restored in parallel during the cross-tenant table import phase of table-level restore.
recover_table_dop	The maximum number of tables that can be restored in parallel during the cross-tenant table 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 a tenant. The default value is `OFF`.
auto_split_tablet_size	The threshold for triggering automatic partitioning after the automatic partitioning feature is enabled for a tenant. The default value is 128 MB.
global_index_auto_split_policy	Specifies whether to enable automatic partitioning for new global indexes. The default value is `DISTRIBUTED`.

Parameter	Description
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 number of worker threads for high-priority high-availability tasks.
ha_mid_thread_score	Specifies the number of worker threads for medium-priority high-availability tasks.
ha_low_thread_score	Specifies the number of worker threads for low-priority high-availability tasks.
ob_compaction_schedule_interval	Specifies the interval between compaction schedules.
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 tablets to be scheduled in each batch during compaction scheduling.
tenant_sql_login_thread_count	Specifies the number of threads for MySQL tenant login, that is, 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 tenants, that is, the number of `sql_nio_server` threads. The default value of 0 indicates that the value of `unit_min_cpu` is used.

Parameter	Description
default_storage_cache_policy	Specifies the default cache strategy.
enable_manual_storage_cache_policy	Specifies whether to enable the user-defined hot cache strategy.
suspend_storage_cache_task	Specifies whether to suspend background cache tasks.
enable_adaptive_plan_cache	Specifies whether to enable adaptive plan cache.
result_cache_max_size	Specifies the maximum memory that can be used by the `result cache` module.
result_cache_max_result	Specifies 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 eviction threshold for `result cache`.
ob_deterministic_udf_cache_max_size	Specifies the maximum 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 the tenant.
compatible	Controls the compatibility behavior of related features in the tenant. This parameter cannot be set.

Parameter name	Description
ob_proxy_readonly_transaction_routing_policy	Specifies whether to route transactions based on read-only statements.

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

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

Parameter name	Description
temporary_file_max_disk_size	Specifies the maximum disk space that a single node of the tenant can occupy for temporary files.

Parameter	Description
enable_kv_ttl	Specifies whether to enable the TTL background task. This parameter applies only to periodic TTL tasks. User control commands are not affected by this parameter. Notice: The TTL feature is applicable only to OceanBase Database Key-Value (KV) scenarios. If you use this feature in SQL scenarios, unexpected data deletion may occur.
kv_ttl_duty_duration	Specifies the time period during which the TTL task is triggered. The TTL task is triggered once during this time period.
kv_group_commit_batch_size	Specifies the size of batch operations executed in the group commit of OBKV.
kv_group_commit_rw_mode	Specifies the mode for group commit.
kv_hbase_client_scanner_timeout_period	Specifies the timeout period for OBKV-HBase streaming queries.
kv_ttl_history_recycle_interval	Specifies the period for which the history records of the TTL task are retained.
ttl_thread_score	Specifies the number of worker threads used by the TTL task.

Parameter	Description
plsql_code_type	Specifies the compilation type of PL/SQL code.
plsql_debug	Specifies whether to compile the code into a debug version.
plsql_optimize_level	Specifies the compilation optimization level.
plsql_v2_compatibility	Specifies whether to enable the feature that allows the compilation and persistence of stored procedure DDL statements.
package_state_sync_max_size	Specifies the maximum length of a package state (package state management) that can be serialized.

Parameter	Description
default_load_mode	Specifies the data import mode in data import scenarios.
direct_load_allow_fallback	Specifies whether to fall back to normal import when direct load is not supported in a specified direct load scenario.

Parameter	Description
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 by a single session.
ob_ssl_invited_common_names	Records the list of application identities running in the current tenant. These 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 batched multi-statement execution optimization.
job_queue_processes	Specifies the maximum number of concurrent tasks that can be run in each tenant. This is to prevent tasks from occupying tenant resources.
default_auto_increment_mode	Specifies the default auto-increment mode.
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 tables in the Extended ROWID mode.
dump_data_dictionary_to_log_interval	Specifies the interval for persisting 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 to be vectorized in one batch by the columnar engine.
approx_count_distinct_precision	Specifies the precision of the result returned by the `approx_count_distinct` function.
enable_ps_parameterize	Specifies whether to enable or disable parameterization for PS statements during parsing.
default_skip_index_level	Specifies the mechanism for generating Skip Indexes in incremental SSTables for the tenant.

Parameter name	Description
log_disk_utilization_limit_threshold	Specifies the threshold for the log disk utilization limit of a tenant. When the log disk usage exceeds the total log disk space multiplied by this value, log writes are no longer allowed.
log_disk_utilization_threshold	Specifies the log disk utilization threshold of a tenant. When the log disk usage exceeds the total log disk space multiplied by this value, 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 fetching logs from a standby database. This parameter controls the log transmission service of the standby database to detect that a server of the primary database is unavailable and switch to another server.
log_disk_throttling_percentage	Specifies the percentage of non-recoverable log disk space that triggers log write throttling.
log_transport_compress_all	Specifies whether to compress logs during 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 persisting transaction logs.
enable_clog_persistence_compress	Specifies whether to enable compression for persisting transaction logs.

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

Parameter name	Description
enable_lock_priority	Lock priority switch.

Parameter name	Description
log_disk_throttling_maximum_duration	Specifies the maximum available time after log throttling is triggered.
ls_gc_delay_time	Specifies the time for delaying the deletion of tenant log streams.
standby_db_preferred_upstream_log_region	Specifies the preferred region for synchronizing upstream logs to a standby tenant.
archive_lag_target	Specifies the time for delaying the archiving of tenant logs.

Parameter	Description
enable_mlog_auto_maintenance	Specifies whether to enable the automatic management of materialized view logs. Note For V4.3.5, this parameter is available starting with V4.3.5 BP4.
mlog_trim_interval	Specifies the scheduling cycle of the background automatic trimming task of materialized view logs (mlogs). Note For V4.3.5, this parameter is available starting with V4.3.5 BP4.
enable_mv_binlog_minimal_mode	Specifies whether to enable the `minimal` mode for materialized views. Note For V4.3.5, this parameter is available starting with V4.3.5 BP5.

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 spillage during SQL execution.
ob_encoding_granularity	Specifies the maximum number of rows in a microblock encoding.

Parameter name	Description
default_progressive_merge_num	Specifies the default number of progressive major compactions when a table is created.
major_freeze_duty_time	Specifies the time when major compactions and freezes are triggered daily.
major_compact_trigger	Specifies the number of major compactions that trigger a major freeze.
minor_compact_trigger	Specifies the number of SSTables that trigger a minor compaction.
undo_retention	Specifies the range of multi-version data to be retained, in seconds. During a minor compaction, the system recycles the multi-version data.
merger_check_interval	Specifies the scheduling interval of the major compaction status check thread.
freeze_trigger_percentage	Specifies the memory usage threshold of a tenant that triggers a global freeze.
max_kept_major_version_number	Specifies the number of major compaction versions to be retained.
merge_stat_sampling_ratio	Specifies the sampling rate of column statistics during a major compaction.
merge_thread_count	Specifies the number of threads for daily major compactions.
merger_completion_percentage	Specifies the percentage of replicas that are considered as completed for a major compaction.
merger_switch_leader_duration_time	Specifies the time interval for batch leader switching during daily major compactions.
merger_warm_up_duration_time	Specifies the warm-up time for the new baseline data during a major compaction.

Parameter name	Description
arbitration_timeout	Specifies the timeout period for automatic downgrade.

Parameter name	Description
sql_work_area	Specifies the tenant workspace memory.
max_stale_time_for_weak_consistency	Specifies the maximum number of versions that can be read in a weak-consistency read.

Overview of parameters

Cluster-level parameters

Security

Backup and restore

cgroup

CPU related

Read/write/query related

Load balancing

Replica-related parameters

Cache-related

Partitioning

Background execution threads

I/O-related

Cluster-related parameters

Bandwidth-related parameters

Location Cache-related parameters

Directory paths

Memory-related

PX-related parameters

Others

Root Service related

RPC authentication

SQL

Transaction and transaction log

Lock

Debug-related

TCP-related

System log-related

Compression algorithm-related

Dumps and major compactions

Arbitration service

Resource isolation

Tenant-level parameters

Security

Storage

Note

CPU

Read/write/query

Load balancing

Replica

Backup and restore

Partition

Background execution threads

Cache

IO related

Compatibility related

Note

Routing related

LOB data related

Memory space related

Disk space related

OBKV

PL

Direct load

Other

Transaction and transaction log related

Data type related

Lock related

System log related

Materialized views

Note

Note

Note

User login

Note

Compression algorithms

Parameters related to major compactions

Parameters related to arbitration

Parameters not supported