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    - 集群级别配置项
      - alert_log_level
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      - all_server_list
      - auto_broadcast_location_cache_rate_limit
      - auto_leader_switch_interval
      - auto_refresh_location_cache_rate_limit
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      - async_ps_cursor_max_count
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      - balancer_emergency_percentage
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      - balancer_tolerance_percentage
      - bf_cache_miss_count_threshold
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      - clog_cache_priority
      - clog_disk_usage_limit_percentage
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      - clog_transport_compress_func
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      - cpu_count
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      - data_disk_usage_limit_percentage
      - data_disk_write_limit_percentage
      - data_storage_error_tolerance_time
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      - datafile_disk_percentage
      - datafile_maxsize
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      - debug_sync_timeout
      - default_compress
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      - devname
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      - dtl_buffer_size
      - election_blacklist_interval
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      - enable_auto_leader_switch
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      - enable_rootservice_standalone
      - enable_rpc_authentication_bypass
      - enable_separate_sys_clog
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      - enable_sql_audit
      - enable_sql_operator_dump
      - enable_sys_table_ddl
      - enable_sys_unit_standalone
      - enable_syslog_recycle
      - enable_syslog_wf
      - enable_tcp_keepalive
      - enable_upgrade_mode
      - external_table_disk_cache_max_percentage
      - fast_recovery_concurrency
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      - fuse_row_cache_priority
      - gc_wait_archive
      - get_leader_candidate_rpc_timeout
      - global_background_cpu_quota
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      - global_major_freeze_residual_memory
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      - high_priority_net_thread_count
      - ignore_replay_checksum_error
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      - ilog_index_expire_time
      - index_block_cache_priority
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      - index_info_block_cache_priority
      - internal_sql_execute_timeout
      - large_query_threshold
      - large_query_worker_percentage
      - leak_mod_to_check
      - lease_time
      - local_ip
      - 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_disk_percentage
      - log_disk_size
      - logservice_access_point
      - log_storage_warning_trigger_percentage
      - log_storage_warning_tolerance_time
      - ls_meta_table_check_interval
      - max_kept_major_version_number
      - max_px_worker_count
      - max_string_print_length
      - max_syslog_file_count
      - memory_chunk_cache_size
      - memory_limit
      - memory_limit_percentage
      - memory_reserved
      - memstore_limit_percentage
      - merge_stat_sampling_ratio
      - merge_thread_count
      - merger_completion_percentage
      - merger_switch_leader_duration_time
      - merger_warm_up_duration_time
      - micro_block_merge_verify_level
      - migrate_concurrency
      - migration_disable_time
      - min_observer_version
      - minor_deferred_gc_time
      - minor_freeze_times
      - minor_merge_concurrency
      - minor_warm_up_duration_time
      - multiblock_read_gap_size
      - multiblock_read_size
      - mysql_port
      - net_thread_count
      - ob_esi_io_concurrency
      - ob_esi_max_syslog_file_count
      - ob_esi_memory_limit
      - ob_esi_rpc_port
      - ob_esi_session_timeout
      - ob_esi_syslog_level
      - ob_event_history_recycle_interval
      - ob_ratelimit_stat_period
      - ob_startup_mode
      - ob_python_home
      - obconfig_url
      - observer_id
      - ob_storage_s3_url_encode_type
      - ob_enable_java_env
      - ob_enable_utl_tcp
      - ob_java_home
      - ob_java_connector_path
      - ob_java_opts
      - ob_enable_utl_http
      - ofs_list
      - opt_tab_stat_cache_priority
      - partition_table_check_interval
      - 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_client_authentication_method
      - rpc_port
      - rpc_server_authentication_method
      - 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
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      - server_data_copy_in_concurrency
      - server_data_copy_out_concurrency
      - server_permanent_offline_time
      - sql_audit_memory_limit
      - sql_login_thread_count
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      - stack_size
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      - switchover_process_thread_count
      - sync_io_thread_count
      - sys_bkgd_io_high_percentage
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      - sys_bkgd_migration_change_member_list_timeout
      - sys_bkgd_migration_retry_num
      - sys_bkgd_net_percentage
      - sys_cpu_limit_trigger
      - syslog_compress_func
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      - syslog_level
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      - tablet_ls_cache_priority
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      - tablet_size
      - tcp_keepcnt
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      - tenant_cpu_variation_per_server
      - tenant_groups
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      - token_reserved_percentage
      - trace_log_sampling_interval
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      - trx_2pc_retry_interval
      - trx_force_kill_threshold
      - trx_try_wait_lock_timeout
      - unit_balance_resource_weight
      - unit_gc_wait_time
      - 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
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plan_cache_low_watermark

更新时间：2026-03-31 18:26:42

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说明

由于该配置项对应功能并未生效过，该配置项从 V4.2.0 版本开始删除。

功能描述

plan_cache_low_watermark 用于设置执行计划缓存占用内存的阈值，如果低于该阈值时将停止淘汰。

属性说明

属性	描述
参数类型	Capacity
默认值	1500M，默认单位为 MB，配置时需说明单位。
取值范围	[0, plan_cache_high_watermark)
是否重启 OBServer 节点生效	否

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plan_cache_low_watermark - OceanBase 数据库 V4.5.0 | OceanBase 文档中心