Dynamically modifiable parameters|V4.0.0|OceanBase Database Proxy| docs|Distributed Database

The following table describes ODP parameters that take effect immediately after modification.

Parameter	Default value	Value range	Description
`proxy_info_check_interval`	60s	[1s, 1h]	The time interval at which ODP checks for configuration updates.
`cache_cleaner_clean_interval`	20s	[1s, 1d]	The time interval at which the cache cleaner cleans the cache.
`server_state_refresh_interval`	20s	(10ms, 1h]	The time interval at which the process status of OceanBase Database is refreshed.
`metadb_server_state_refresh_interval`	60s	[10ms, 1h]	The time interval at which the MetaDB is refreshed.
`config_server_refresh_interval`	60s	[10s, 1d]	The time interval at which the config server is refreshed.
`idc_list_refresh_interval`	2h	[10s, 1d]	The time interval at which the IDC information is refreshed.
`stat_dump_interval`	6000s	[0s, 1d]	The time interval at which the global statistics dumping task is executed.
`stat_table_sync_interval`	60s	[0s,1d]	The time interval at which the global statistics on internal tables are updated.
`cluster_count_high_water_mark`	256	[2, 102400]	The maximum size of resources that can be created in the cluster.
`cluster_expire_time`	1d	[0, +∞)	The idle timeout period of the cluster metadata.
`fetch_proxy_bin_random_time`	300s	[1s, 1h]	The maximum wait time before ODP can fetch new binary files in a hot upgrade.
`hot_upgrade_rollback_timeout`	24h	[1s, 30d]	The default wait time to execute a rollback after a hot upgrade.
`hot_upgrade_failure_retries`	5	[1, 20]	The number of retries allowed after a hot upgrade failed.
`fetch_proxy_bin_timeout`	120s	[1s, 1200s]	The timeout period for fetching new binary files in a hot upgrade.
`delay_exit_time`	100ms	[100ms, 500ms]	The amount of time by which an ODP exit is delayed.
`log_file_percentage`	80	[0, 100]	The percentage threshold of ODP logs. Log files are cleaned up when the threshold is exceeded.
`log_cleanup_interval`	1m	[5s, 30d]	The time interval at which the cleanup task is executed.
`log_dir_size_threshold`	64GB	[256MB, 1T]	The size threshold of ODP logs. Log files are cleaned up when the threshold is exceeded.
`max_log_file_size`	256MB	[1MB, 1G]	The maximum size of a log file.
`long_async_task_timeout`	60s	[1s, 1h]	The timeout period of long asynchronous tasks.
`short_async_task_timeout`	5s	[1s, 1h]	The timeout period of short asynchronous tasks.
`client_max_connections`	8192	[0, +∞]	The maximum number of client connections supported by ODP.
`observer_query_timeout_delta`	20s	[1s, 30s]	The `ob_query_timeout` incremental value for the OceanBase Database process.
`enable_cluster_checkout`	true	/	Specifies whether to verify the cluster name.
`enable_client_ip_checkout`	true	/	Specifies whether to verify the IP address of the client.
`connect_observer_max_retries`	3	[2, 5]	The maximum number of retries allowed when ODP connects to OceanBase Database.
`net_config_poll_timeout`	1ms	[0, +∞)	The timeout period for network events.
`default_inactivity_timeout`	180000s	[1s, 30d]	The default timeout period for TCP connections.
`sock_send_buffer_size_out`	0	[0, 8MB]	The send buffer size of the socket.
`sock_recv_buffer_size_out`	0	[0, 8MB]	The receive buffer size of the socket.
`sock_option_flag_out`	3	[0, +∞]	The socket flag.
`sock_packet_mark_out`	0	[0, +∞]	The socket mark.
`sock_packet_tos_out`	0	[0, +∞]	The socket TOS.
`server_tcp_init_cwnd`	0	[0, 64]	The initial congestion window specified when a TCP connection to the OBServer was created.
`server_tcp_keepidle`	5	[0, 7200]	The TCP keepalive idle time for the connection between ODP and OceanBase Database.
`server_tcp_keepintvl`	5	[0, 75]	The TCP keepalive interval for the connection between ODP and OceanBase Database.
`server_tcp_keepcnt`	5	[0, 9]	The TCP keepalive probe count for the connection between ODP and OceanBase Database.
`server_tcp_user_timeout`	0	[0, 20]	The TCP user timeout period for the connection between ODP and OceanBase Database.
`client_sock_option_flag_out`	2	[0, +∞)	The socket flag between ODP and the client.
`client_tcp_keepidle`	5	[0, 7200]	The TCP keepalive time for the connection between ODP and the client.
`client_tcp_keepintvl`	5	[0, 75]	The TCP keepalive interval for the connection between ODP and the client.
`client_tcp_keepcnt`	5	[0, 9]	Specifies the TCP keepalive probe count for the connection between ODP and the client.
`client_tcp_user_timeout`	0	[0, 20]	The TCP user timeout period for the connection between ODP and the client.
`proxy_mem_limited`	2G	[100MB, 100G]	The maximum memory usage during the ODP runtime. ODP automatically exits when the limit is exceeded.
`routing_cache_mem_limited`	128M	[1KB, 100G]	The maximum memory usage for the routing cache of PL/SQL queries.
`enable_flow_control`	true	/	Specifies whether to enable throttling in the tunnel.
`flow_high_water_mark`	64k	[0, 16MB]	The traffic upper limit that triggers tunnel throttling.
`flow_low_water_mark`	64k	[0, 16MB]	The lower limit for tunnel throttling.
`flow_consumer_reenable_threshold`	256	[0, 131072]	The tunnel throttling threshold on the number of data forwards.
`flow_event_queue_threshold`	5	[0, 20]	The tunnel throttling threshold on the number of tasks in the worker thread queue.
`tunnel_request_size_threshold`	8KB	(0, 16MB]	Specifies the threshold of requests received by ODP. When the size of client requests exceeds this threshold, ODP uses the tunnel to forward them and does not parse them.
`request_buffer_length`	4KB	[1KB, 16MB]	The size of the request buffer.
`default_buffer_water_mark`	32KB	[4B, 64KB]	The default buffer high-water mark.
`enable_trans_detail_stats`	true	/	Specifies whether to enable collection of transaction status statistics.
`enable_sync_all_stats`	true	/	Specifies whether to synchronize all statistics.
`enable_report_session_stats`	false	/	Specifies whether to enable the reporting of session-level statistics to internal tables.
`enable_strict_stat_time`	true	/	Specifies whether to enable the strict statistic time.
`enable_trace_stats`	false	/	Specifies whether to enable MySQL tracing.
`slow_transaction_time_threshold`	1s	[0s, 30d]	The transaction execution time threshold. When the execution time exceeds the threshold, an alert is registered in the log.
`slow_proxy_process_time_threshold`	2 ms	[0s, 30d]	The execution time threshold of the ODP pre-execution request. When the execution time exceeds the threshold, an alert is registered in the log.
`query_digest_time_threshold`	100ms	[0s, 30d]	The time threshold for query execution. When the execution of a query takes a longer time than this threshold, a record is logged in `obproxy_digest.log`.
`slow_query_time_threshold`	500ms	[0s, 30d]	The execution time threshold of slow queries. When the execution time exceeds the threshold, a log record is registered in the `obproxy_slow.log` file.
`ignore_local_config`	true	/	Specifies whether to ignore the local configuration file.
`congestion_failure_threshold`	5	[0, +∞)	The threshold to blacklist a faulty OBServer. If the number of OBServer errors within the period specified by `congestion_fail_window` exceeds the threshold, ODP adds the server to the blacklist.
`min_keep_congestion_interval`	20s	[1s, 1d]	The minimum wait time to unblacklist an OBServer.
`congestion_fail_window`	120s	[1s, 1h]	The statistical period for collecting OBServer errors. This parameter is used in conjunction with `confesson_failure_threshold`.
`congestion_retry_interval`	20s	[1s, 1h]	The time interval to retry the blacklisted OBServers that are alive but disabled.
`min_congested_connect_timeout`	100ms	[1ms, 1h]	The minimum timeout period for retrying the blacklisted OBServers that are alive but disabled.
`enable_congestion`	true	/	Specifies whether to enable the blacklist.
`enable_bad_route_reject`	false	/	Specifies whether to reject requests that cannot be routed when the blacklist is enabled.
`enable_partition_table_route`	true	/	Specifies whether to enable routing for partitioned tables.
`enable_reroute`	false	/	Specifies whether to enable rerouting.
`enable_pl_route`	true	/	Specifies whether to enable Procedural Language (PL) routing.
`syslog_level`	INFO	DEBUG, TRACE, INFO, WARN, USER_ERR, ERROR	The log level.
`monitor_log_level`	INFO	DEBUG, TRACE, INFO, WARN, USER_ERR, ERROR	The monitoring log level.
`xflush_log_level`	INFO	DEBUG, TRACE, INFO, WARN, USER_ERR, ERROR	The xflush log level.
`enable_async_log`	true	/	Specifies whether to enable the asynchronous logs.