ProxySQL查看所有的全局变量及更新操作
mysql> select * from global_variables;+----------------------------------------------------------------------+--------------------------------------------+| variable_name | variable_value |+----------------------------------------------------------------------+--------------------------------------------+| admin-stats_credentials | stats:stats || admin-stats_mysql_connections | 60 || admin-stats_mysql_connection_pool | 60 || admin-stats_mysql_query_cache | 60 || admin-stats_mysql_query_digest_to_disk | 0 || admin-stats_system_cpu | 60 || admin-stats_system_memory | 60 || admin-telnet_admin_ifaces | (null) || admin-telnet_stats_ifaces | (null) || admin-refresh_interval | 2000 || admin-read_only | false || admin-hash_passwords | true || admin-vacuum_stats | true || admin-version | 2.4.1-1-g1ea371d || admin-cluster_mysql_variables_diffs_before_sync | 3 || admin-cluster_admin_variables_diffs_before_sync | 3 || admin-cluster_ldap_variables_diffs_before_sync | 3 || admin-cluster_mysql_variables_save_to_disk | true || admin-cluster_admin_variables_save_to_disk | true || admin-cluster_ldap_variables_save_to_disk | true || admin-checksum_mysql_query_rules | true || admin-checksum_mysql_servers | true || admin-checksum_mysql_users | true || admin-checksum_mysql_variables | true || admin-checksum_admin_variables | true || admin-checksum_ldap_variables | true || admin-restapi_enabled | false || admin-restapi_port | 6070 || admin-web_enabled | true || admin-web_port | 6080 || admin-web_verbosity | 0 || admin-prometheus_memory_metrics_interval | 61 || admin-admin_credentials | admin:admin;cluster_20X:123456 || admin-mysql_ifaces | 0.0.0.0:6032 || admin-cluster_username | cluster_20X || admin-cluster_password | 123456 || admin-cluster_check_interval_ms | 200 || admin-cluster_check_status_frequency | 100 || admin-cluster_mysql_query_rules_save_to_disk | true || admin-cluster_mysql_servers_save_to_disk | true || admin-cluster_mysql_users_save_to_disk | true || admin-cluster_proxysql_servers_save_to_disk | true || admin-cluster_mysql_query_rules_diffs_before_sync | 3 || admin-cluster_mysql_servers_diffs_before_sync | 3 || admin-cluster_mysql_users_diffs_before_sync | 3 || admin-cluster_proxysql_servers_diffs_before_sync | 3 || mysql-default_charset | utf8 || mysql-default_collation_connection | utf8_general_ci || mysql-shun_on_failures | 5 || mysql-shun_recovery_time_sec | 10 || mysql-unshun_algorithm | 0 || mysql-query_retries_on_failure | 1 || mysql-client_host_cache_size | 0 || mysql-client_host_error_counts | 0 || mysql-connect_retries_delay | 1 || mysql-connection_delay_multiplex_ms | 0 || mysql-connection_max_age_ms | 0 || mysql-connect_timeout_client | 10000 || mysql-connect_timeout_server_max | 10000 || mysql-enable_client_deprecate_eof | true || mysql-enable_server_deprecate_eof | true || mysql-enable_load_data_local_infile | false || mysql-eventslog_filename | || mysql-eventslog_filesize | 104857600 || mysql-eventslog_default_log | 0 || mysql-eventslog_format | 1 || mysql-auditlog_filename | || mysql-auditlog_filesize | 104857600 || mysql-handle_unknown_charset | 1 || mysql-free_connections_pct | 10 || mysql-connection_warming | false || mysql-session_idle_ms | 1 || mysql-have_ssl | false || mysql-log_mysql_warnings_enabled | false || mysql-monitor_enabled | true || mysql-monitor_connect_timeout | 600 || mysql-monitor_ping_max_failures | 3 || mysql-monitor_ping_timeout | 1000 || mysql-monitor_read_only_max_timeout_count | 3 || mysql-monitor_replication_lag_group_by_host | false || mysql-monitor_replication_lag_interval | 10000 || mysql-monitor_replication_lag_timeout | 1000 || mysql-monitor_replication_lag_count | 1 || mysql-monitor_groupreplication_healthcheck_interval | 5000 || mysql-monitor_groupreplication_healthcheck_timeout | 800 || mysql-monitor_groupreplication_healthcheck_max_timeout_count | 3 || mysql-monitor_groupreplication_max_transactions_behind_count | 3 || mysql-monitor_groupreplication_max_transactions_behind_for_read_only | 1 || mysql-monitor_galera_healthcheck_interval | 5000 || mysql-monitor_galera_healthcheck_timeout | 800 || mysql-monitor_galera_healthcheck_max_timeout_count | 3 || mysql-monitor_replication_lag_use_percona_heartbeat | || mysql-monitor_query_interval | 60000 || mysql-monitor_query_timeout | 100 || mysql-monitor_slave_lag_when_null | 60 || mysql-monitor_threads_min | 8 || mysql-monitor_threads_max | 128 || mysql-monitor_threads_queue_maxsize | 128 || mysql-monitor_wait_timeout | true || mysql-monitor_writer_is_also_reader | true || mysql-max_allowed_packet | 67108864 || mysql-tcp_keepalive_time | 0 || mysql-use_tcp_keepalive | false || mysql-automatic_detect_sqli | false || mysql-firewall_whitelist_enabled | false || mysql-firewall_whitelist_errormsg | Firewall blocked this query || mysql-throttle_connections_per_sec_to_hostgroup | 1000000 || mysql-max_transaction_idle_time | 14400000 || mysql-max_transaction_time | 14400000 || mysql-multiplexing | true || mysql-log_unhealthy_connections | true || mysql-enforce_autocommit_on_reads | false || mysql-autocommit_false_not_reusable | false || mysql-autocommit_false_is_transaction | false || mysql-verbose_query_error | false || mysql-hostgroup_manager_verbose | 1 || mysql-binlog_reader_connect_retry_msec | 3000 || mysql-threshold_query_length | 524288 || mysql-threshold_resultset_size | 4194304 || mysql-query_digests_max_digest_length | 2048 || mysql-query_digests_max_query_length | 65000 || mysql-query_digests_grouping_limit | 3 || mysql-query_digests_groups_grouping_limit | 0 || mysql-wait_timeout | 28800000 || mysql-throttle_max_bytes_per_second_to_client | 0 || mysql-throttle_ratio_server_to_client | 0 || mysql-max_stmts_per_connection | 20 || mysql-max_stmts_cache | 10000 || mysql-mirror_max_concurrency | 16 || mysql-mirror_max_queue_length | 32000 || mysql-default_max_latency_ms | 1000 || mysql-query_processor_iterations | 0 || mysql-query_processor_regex | 1 || mysql-set_query_lock_on_hostgroup | 0 || mysql-reset_connection_algorithm | 2 || mysql-auto_increment_delay_multiplex | 5 || mysql-auto_increment_delay_multiplex_timeout_ms | 10000 || mysql-long_query_time | 1000 || mysql-query_cache_size_MB | 256 || mysql-poll_timeout_on_failure | 100 || mysql-keep_multiplexing_variables | tx_isolation,transaction_isolation,version || mysql-kill_backend_connection_when_disconnect | true || mysql-client_session_track_gtid | true || mysql-session_idle_show_processlist | true || mysql-show_processlist_extended | 0 || mysql-query_digests | true || mysql-query_digests_lowercase | false || mysql-query_digests_replace_null | false || mysql-query_digests_no_digits | false || mysql-query_digests_normalize_digest_text | false || mysql-query_digests_track_hostname | false || mysql-query_digests_keep_comment | false || mysql-servers_stats | true || mysql-default_reconnect | true || mysql-ssl_p2s_ca | || mysql-ssl_p2s_capath | || mysql-ssl_p2s_cert | || mysql-ssl_p2s_key | || mysql-ssl_p2s_cipher | || mysql-ssl_p2s_crl | || mysql-ssl_p2s_crlpath | || mysql-init_connect | || mysql-ldap_user_variable | || mysql-add_ldap_user_comment | || mysql-default_tx_isolation | READ-COMMITTED || mysql-default_session_track_gtids | OFF || mysql-connpoll_reset_queue_length | 50 || mysql-min_num_servers_lantency_awareness | 1000 || mysql-aurora_max_lag_ms_only_read_from_replicas | 2 || mysql-stats_time_backend_query | false || mysql-stats_time_query_processor | false || mysql-query_cache_stores_empty_result | true || mysql-threads | 4 || mysql-max_connections | 2048 || mysql-default_query_delay | 0 || mysql-default_query_timeout | 36000000 || mysql-have_compress | true || mysql-poll_timeout | 2000 || mysql-interfaces | 0.0.0.0:6033 || mysql-default_schema | information_schema || mysql-stacksize | 1048576 || mysql-server_version | 5.7.22 || mysql-connect_timeout_server | 3000 || mysql-monitor_username | proxysql || mysql-monitor_password | iD!^^EjU#Yxr5$p || mysql-monitor_history | 600000 || mysql-monitor_connect_interval | 60000 || mysql-monitor_ping_interval | 10000 || mysql-monitor_read_only_interval | 1500 || mysql-monitor_read_only_timeout | 500 || mysql-ping_interval_server_msec | 120000 || mysql-ping_timeout_server | 500 || mysql-commands_stats | true || mysql-sessions_sort | true || mysql-connect_retries_on_failure | 10 || mysql-server_capabilities | 569899 |+----------------------------------------------------------------------+--------------------------------------------+196 rows in set (0.00 sec)
update global_variables set variable_value=100 where variable_name='mysql-monitor_ping_timeout';load mysql variables to runtime; # 上一个一句中mysql-monitor_ping_timeout是mysql开头，因此要保存的是mysql有关的save mysql variables to disk;
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