MySQL 8.0 OCP (1Z0-908) 考点精析-安装与配置考点1：设置系统变量
【MySQL】控制MySQL优化器行为方法之optimizer_switch系统变量
【MySQL】MySQL系统变量（system variables）列表（mysqld --verbose --help的结果例）
【MySQL】MySQL系统变量（system variables）列表（SHOW VARIABLES 的结果例）
MySQL 8.0 OCP (1Z0-908) 考点精析-备份与恢复考点1：MySQL Enterprise Backup概要
MySQL 8.0 OCP (1Z0-908) 考点精析-性能优化考点1：sys.statement_analysis视图
MySQL 8.0 OCP (1Z0-908) 考点精析-性能优化考点2：系统变量的确认
MySQL 8.0 OCP (1Z0-908) 考点精析-性能优化考点3：EXPLAIN ANALYZE
MySQL 8.0 OCP (1Z0-908) 考点精析-性能优化考点4：慢速查询日志（slow query log）
MySQL 8.0 OCP (1Z0-908) 考点精析-性能优化考点5：表连接算法（join algorithm）
MySQL 8.0 OCP (1Z0-908) 考点精析-性能优化考点6：MySQL Enterprise Monitor之Query Analyzer
MySQL 8.0 OCP (1Z0-908) 考点精析-架构考点1：二进制日志文件（Binary log）
MySQL 8.0 OCP (1Z0-908) 考点精析-架构考点5：数据字典(Data Dictionary)
MySQL 8.0 OCP (1Z0-908) 考点精析-架构考点6：InnoDB Tablespaces之系统表空间（System Tablespace）
MySQL 8.0 InnoDB Tablespaces之File-per-table tablespaces（单独表空间）
MySQL 8.0 InnoDB Tablespaces之General Tablespaces（通用表空间/一般表空间）
【MySQL】在数据目录之外创建InnoDB 表（Creating Tables Externally）
MySQL 8.0 InnoDB Tablespaces之Temporary Tablespaces（临时表空间）
MySQL 8.0 InnoDB 架构之 日志缓冲区（Log Buffer）和重做日志（Redo Log）
MySQL 8.0 架构 之错误日志文件（Error Log）（1）
MySQL提供了许多状态变量用于监视数据库相关的动作信息，可以使用SHOW [GLOBAL | SESSION] STATUS语句查看这些变量信息。
下面是MySQL 8.0 状态变量信息（show status的结果例）。
例：
mysql> select version();
+-------------------------+
| version() |
+-------------------------+
| 8.0.35-0ubuntu0.22.04.1 |
+-------------------------+
1 row in set (0.00 sec)
mysql>
mysql> show status;
+-------------------------------------------------------+-----------------------------------------------+
| Variable_name | Value |
+-------------------------------------------------------+-----------------------------------------------+
| Aborted_clients | 0 |
| Aborted_connects | 2 |
| Acl_cache_items_count | 0 |
| Binlog_cache_disk_use | 0 |
| Binlog_cache_use | 12 |
| Binlog_stmt_cache_disk_use | 0 |
| Binlog_stmt_cache_use | 0 |
| Bytes_received | 295 |
| Bytes_sent | 226 |
| Caching_sha2_password_rsa_public_key | -----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtV9pQFfRgnehmEpaus5+
FHb6ZzZW8akQcn3gW8FC4wrpbO7tn/d0Fs9tF4dgHUN6eFJb8YvbD4ApBsttsGQt
fSTGLH1cHGb9DVrzNNssdmVxAAUCSLrOYkqOK1iC1zafKG2wOjkts7CWVEQ5J8ol
e80ET+pc+rRimL2OgOrUhyeB8W5tqpT69RwhZEM0SS1FVoVnJE2iCl32X4nt0Njv
cjXp1XbkSftjRpm8oUlH3wej+9jGGtRV5uBG7+NVUQt20hKvEb8F9NLFv4z9wnTG
oEMUlJOFUn5/yxvmgyMyKcYSaMav13+CqvzC5CzCafVAkNh+V/egylJ3EDDa6Jl6
qQIDAQAB
-----END PUBLIC KEY-----
|
| Com_admin_commands | 0 |
| Com_assign_to_keycache | 0 |
| Com_alter_db | 0 |
| Com_alter_event | 0 |
| Com_alter_function | 0 |
| Com_alter_instance | 0 |
| Com_alter_procedure | 0 |
| Com_alter_resource_group | 0 |
| Com_alter_server | 0 |
| Com_alter_table | 0 |
| Com_alter_tablespace | 0 |
| Com_alter_user | 0 |
| Com_alter_user_default_role | 0 |
| Com_analyze | 0 |
| Com_begin | 0 |
| Com_binlog | 0 |
| Com_call_procedure | 0 |
| Com_change_db | 0 |
| Com_change_master | 0 |
| Com_change_repl_filter | 0 |
| Com_change_replication_source | 0 |
| Com_check | 0 |
| Com_checksum | 0 |
| Com_clone | 0 |
| Com_commit | 0 |
| Com_create_db | 0 |
| Com_create_event | 0 |
| Com_create_function | 0 |
| Com_create_index | 0 |
| Com_create_procedure | 0 |
| Com_create_role | 0 |
| Com_create_server | 0 |
| Com_create_table | 0 |
| Com_create_resource_group | 0 |
| Com_create_trigger | 0 |
| Com_create_udf | 0 |
| Com_create_user | 0 |
| Com_create_view | 0 |
| Com_create_spatial_reference_system | 0 |
| Com_dealloc_sql | 0 |
| Com_delete | 0 |
| Com_delete_multi | 0 |
| Com_do | 0 |
| Com_drop_db | 0 |
| Com_drop_event | 0 |
| Com_drop_function | 0 |
| Com_drop_index | 0 |
| Com_drop_procedure | 0 |
| Com_drop_resource_group | 0 |
| Com_drop_role | 0 |
| Com_drop_server | 0 |
| Com_drop_spatial_reference_system | 0 |
| Com_drop_table | 0 |
| Com_drop_trigger | 0 |
| Com_drop_user | 0 |
| Com_drop_view | 0 |
| Com_empty_query | 0 |
| Com_execute_sql | 0 |
| Com_explain_other | 0 |
| Com_flush | 0 |
| Com_get_diagnostics | 0 |
| Com_grant | 0 |
| Com_grant_roles | 0 |
| Com_ha_close | 0 |
| Com_ha_open | 0 |
| Com_ha_read | 0 |
| Com_help | 0 |
| Com_import | 0 |
| Com_insert | 0 |
| Com_insert_select | 0 |
| Com_install_component | 0 |
| Com_install_plugin | 0 |
| Com_kill | 0 |
| Com_load | 0 |
| Com_lock_instance | 0 |
| Com_lock_tables | 0 |
| Com_optimize | 0 |
| Com_preload_keys | 0 |
| Com_prepare_sql | 0 |
| Com_purge | 0 |
| Com_purge_before_date | 0 |
| Com_release_savepoint | 0 |
| Com_rename_table | 0 |
| Com_rename_user | 0 |
| Com_repair | 0 |
| Com_replace | 0 |
| Com_replace_select | 0 |
| Com_reset | 0 |
| Com_resignal | 0 |
| Com_restart | 0 |
| Com_revoke | 0 |
| Com_revoke_all | 0 |
| Com_revoke_roles | 0 |
| Com_rollback | 0 |
| Com_rollback_to_savepoint | 0 |
| Com_savepoint | 0 |
| Com_select | 1 |
| Com_set_option | 0 |
| Com_set_password | 0 |
| Com_set_resource_group | 0 |
| Com_set_role | 0 |
| Com_signal | 0 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 0 |
| Com_show_charsets | 0 |
| Com_show_collations | 0 |
| Com_show_create_db | 0 |
| Com_show_create_event | 0 |
| Com_show_create_func | 0 |
| Com_show_create_proc | 0 |
| Com_show_create_table | 0 |
| Com_show_create_trigger | 0 |
| Com_show_databases | 0 |
| Com_show_engine_logs | 0 |
| Com_show_engine_mutex | 0 |
| Com_show_engine_status | 0 |
| Com_show_events | 0 |
| Com_show_errors | 0 |
| Com_show_fields | 0 |
| Com_show_function_code | 0 |
| Com_show_function_status | 0 |
| Com_show_grants | 0 |
| Com_show_keys | 0 |
| Com_show_master_status | 0 |
| Com_show_open_tables | 0 |
| Com_show_plugins | 0 |
| Com_show_privileges | 0 |
| Com_show_procedure_code | 0 |
| Com_show_procedure_status | 0 |
| Com_show_processlist | 0 |
| Com_show_profile | 0 |
| Com_show_profiles | 0 |
| Com_show_relaylog_events | 0 |
| Com_show_replicas | 0 |
| Com_show_slave_hosts | 0 |
| Com_show_replica_status | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 1 |
| Com_show_storage_engines | 0 |
| Com_show_table_status | 0 |
| Com_show_tables | 0 |
| Com_show_triggers | 0 |
| Com_show_variables | 0 |
| Com_show_warnings | 0 |
| Com_show_create_user | 0 |
| Com_shutdown | 0 |
| Com_replica_start | 0 |
| Com_slave_start | 0 |
| Com_replica_stop | 0 |
| Com_slave_stop | 0 |
| Com_group_replication_start | 0 |
| Com_group_replication_stop | 0 |
| Com_stmt_execute | 0 |
| Com_stmt_close | 0 |
| Com_stmt_fetch | 0 |
| Com_stmt_prepare | 0 |
| Com_stmt_reset | 0 |
| Com_stmt_send_long_data | 0 |
| Com_truncate | 0 |
| Com_uninstall_component | 0 |
| Com_uninstall_plugin | 0 |
| Com_unlock_instance | 0 |
| Com_unlock_tables | 0 |
| Com_update | 0 |
| Com_update_multi | 0 |
| Com_xa_commit | 0 |
| Com_xa_end | 0 |
| Com_xa_prepare | 0 |
| Com_xa_recover | 0 |
| Com_xa_rollback | 0 |
| Com_xa_start | 0 |
| Com_stmt_reprepare | 0 |
| Compression | OFF |
| Compression_algorithm | |
| Compression_level | 0 |
| Connection_errors_accept | 0 |
| Connection_errors_internal | 0 |
| Connection_errors_max_connections | 0 |
| Connection_errors_peer_address | 0 |
| Connection_errors_select | 0 |
| Connection_errors_tcpwrap | 0 |
| Connections | 25 |
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 5 |
| Created_tmp_tables | 0 |
| Current_tls_ca | ca.pem |
| Current_tls_capath | |
| Current_tls_cert | server-cert.pem|
| Current_tls_cipher | |
| Current_tls_ciphersuites | |
| Current_tls_crl | |
| Current_tls_crlpath | |
| Current_tls_key | server-key.pem |
| Current_tls_version | TLSv1.2,TLSv1.3|
| Delayed_errors | 0 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Error_log_buffered_bytes | 17144 |
| Error_log_buffered_events | 114 |
| Error_log_expired_events | 0 |
| Error_log_latest_write | 1703926836878871|
| Flush_commands | 3 |
| Global_connection_memory | 0 |
| Handler_commit | 0 |
| Handler_delete | 0 |
| Handler_discover | 0 |
| Handler_external_lock | 0 |
| Handler_mrr_init | 0 |
| Handler_prepare | 0 |
| Handler_read_first | 0 |
| Handler_read_key | 0 |
| Handler_read_last | 0 |
| Handler_read_next | 0 |
| Handler_read_prev | 0 |
| Handler_read_rnd | 0 |
| Handler_read_rnd_next | 0 |
| Handler_rollback | 0 |
| Handler_savepoint | 0 |
| Handler_savepoint_rollback | 0 |
| Handler_update | 0 |
| Handler_write | 0 |
| Innodb_buffer_pool_dump_status | Dumping of buffer pool not started |
| Innodb_buffer_pool_load_status | Buffer pool(s) load completed at 231228 11:28:14 |
| Innodb_buffer_pool_resize_status | |
| Innodb_buffer_pool_resize_status_code | 0 |
| Innodb_buffer_pool_resize_status_progress | 0 |
| Innodb_buffer_pool_pages_data | 1430 |
| Innodb_buffer_pool_bytes_data | 23429120 |
| Innodb_buffer_pool_pages_dirty | 0 |
| Innodb_buffer_pool_bytes_dirty | 0 |
| Innodb_buffer_pool_pages_flushed | 1295 |
| Innodb_buffer_pool_pages_free | 6749 |
| Innodb_buffer_pool_pages_misc | 13 |
| Innodb_buffer_pool_pages_total | 8192 |
| Innodb_buffer_pool_read_ahead_rnd | 0 |
| Innodb_buffer_pool_read_ahead | 0 |
| Innodb_buffer_pool_read_ahead_evicted | 0 |
| Innodb_buffer_pool_read_requests | 65355 |
| Innodb_buffer_pool_reads | 1219 |
| Innodb_buffer_pool_wait_free | 0 |
| Innodb_buffer_pool_write_requests | 6687 |
| Innodb_data_fsyncs | 1520 |
| Innodb_data_pending_fsyncs | 0 |
| Innodb_data_pending_reads | 0 |
| Innodb_data_pending_writes | 0 |
| Innodb_data_read | 20040704 |
| Innodb_data_reads | 1338 |
| Innodb_data_writes | 2595 |
| Innodb_data_written | 24901120 |
| Innodb_dblwr_pages_written | 1146 |
| Innodb_dblwr_writes | 314 |
| Innodb_redo_log_read_only | OFF |
| Innodb_redo_log_uuid | 1075899837 |
| Innodb_redo_log_checkpoint_lsn | 486673283 |
| Innodb_redo_log_current_lsn | 486673283 |
| Innodb_redo_log_flushed_to_disk_lsn | 486673283 |
| Innodb_redo_log_logical_size | 512 |
| Innodb_redo_log_physical_size | 3276800 |
| Innodb_redo_log_capacity_resized | 104857600 |
| Innodb_redo_log_resize_status | OK |
| Innodb_log_waits | 0 |
| Innodb_log_write_requests | 3703 |
| Innodb_log_writes | 652 |
| Innodb_os_log_fsyncs | 415 |
| Innodb_os_log_pending_fsyncs | 0 |
| Innodb_os_log_pending_writes | 0 |
| Innodb_os_log_written | 1599488 |
| Innodb_page_size | 16384 |
| Innodb_pages_created | 329 |
| Innodb_pages_read | 1218 |
| Innodb_pages_written | 1406 |
| Innodb_redo_log_enabled | ON |
| Innodb_row_lock_current_waits | 0 |
| Innodb_row_lock_time | 0 |
| Innodb_row_lock_time_avg | 0 |
| Innodb_row_lock_time_max | 0 |
| Innodb_row_lock_waits | 0 |
| Innodb_rows_deleted | 0 |
| Innodb_rows_inserted | 0 |
| Innodb_rows_read | 0 |
| Innodb_rows_updated | 0 |
| Innodb_system_rows_deleted | 65 |
| Innodb_system_rows_inserted | 152 |
| Innodb_system_rows_read | 12883 |
| Innodb_system_rows_updated | 459 |
| Innodb_sampled_pages_read | 0 |
| Innodb_sampled_pages_skipped | 0 |
| Innodb_num_open_files | 69 |
| Innodb_truncated_status_writes | 0 |
| Innodb_undo_tablespaces_total | 3 |
| Innodb_undo_tablespaces_implicit | 2 |
| Innodb_undo_tablespaces_explicit | 1 |
| Innodb_undo_tablespaces_active | 3 |
| Key_blocks_not_flushed | 0 |
| Key_blocks_unused | 13396 |
| Key_blocks_used | 0 |
| Key_read_requests | 0 |
| Key_reads | 0 |
| Key_write_requests | 0 |
| Key_writes | 0 |
| Last_query_cost | 0.000000 |
| Last_query_partial_plans | 0 |
| Locked_connects | 0 |
| Max_execution_time_exceeded | 0 |
| Max_execution_time_set | 0 |
| Max_execution_time_set_failed | 0 |
| Max_used_connections | 3 |
| Max_used_connections_time | 2023-12-30 00:00:28 |
| Mysqlx_aborted_clients | 0 |
| Mysqlx_address | 127.0.0.1 |
| Mysqlx_bytes_received | 0 |
| Mysqlx_bytes_received_compressed_payload | 0 |
| Mysqlx_bytes_received_uncompressed_frame | 0 |
| Mysqlx_bytes_sent | 0 |
| Mysqlx_bytes_sent_compressed_payload | 0 |
| Mysqlx_bytes_sent_uncompressed_frame | 0 |
| Mysqlx_compression_algorithm | |
| Mysqlx_compression_level | |
| Mysqlx_connection_accept_errors | 0 |
| Mysqlx_connection_errors | 0 |
| Mysqlx_connections_accepted | 0 |
| Mysqlx_connections_closed | 0 |
| Mysqlx_connections_rejected | 0 |
| Mysqlx_crud_create_view | 0 |
| Mysqlx_crud_delete | 0 |
| Mysqlx_crud_drop_view | 0 |
| Mysqlx_crud_find | 0 |
| Mysqlx_crud_insert | 0 |
| Mysqlx_crud_modify_view | 0 |
| Mysqlx_crud_update | 0 |
| Mysqlx_cursor_close | 0 |
| Mysqlx_cursor_fetch | 0 |
| Mysqlx_cursor_open | 0 |
| Mysqlx_errors_sent | 0 |
| Mysqlx_errors_unknown_message_type | 0 |
| Mysqlx_expect_close | 0 |
| Mysqlx_expect_open | 0 |
| Mysqlx_init_error | 0 |
| Mysqlx_messages_sent | 0 |
| Mysqlx_notice_global_sent | 0 |
| Mysqlx_notice_other_sent | 0 |
| Mysqlx_notice_warning_sent | 0 |
| Mysqlx_notified_by_group_replication | 0 |
| Mysqlx_port | 33060 |
| Mysqlx_prep_deallocate | 0 |
| Mysqlx_prep_execute | 0 |
| Mysqlx_prep_prepare | 0 |
| Mysqlx_rows_sent | 0 |
| Mysqlx_sessions | 0 |
| Mysqlx_sessions_accepted | 0 |
| Mysqlx_sessions_closed | 0 |
| Mysqlx_sessions_fatal_error | 0 |
| Mysqlx_sessions_killed | 0 |
| Mysqlx_sessions_rejected | 0 |
| Mysqlx_socket | /var/run/mysqld/mysqlx.sock |
| Mysqlx_ssl_accepts | 0 |
| Mysqlx_ssl_active | |
| Mysqlx_ssl_cipher | |
| Mysqlx_ssl_cipher_list | |
| Mysqlx_ssl_ctx_verify_depth | 18446744073709551615 |
| Mysqlx_ssl_ctx_verify_mode | 5 |
| Mysqlx_ssl_finished_accepts | 0 |
| Mysqlx_ssl_server_not_after | Mar 23 00:59:48 2033 GMT |
| Mysqlx_ssl_server_not_before | Mar 26 00:59:48 2023 GMT |
| Mysqlx_ssl_verify_depth | |
| Mysqlx_ssl_verify_mode | |
| Mysqlx_ssl_version | |
| Mysqlx_stmt_create_collection | 0 |
| Mysqlx_stmt_create_collection_index | 0 |
| Mysqlx_stmt_disable_notices | 0 |
| Mysqlx_stmt_drop_collection | 0 |
| Mysqlx_stmt_drop_collection_index | 0 |
| Mysqlx_stmt_enable_notices | 0 |
| Mysqlx_stmt_ensure_collection | 0 |
| Mysqlx_stmt_execute_mysqlx | 0 |
| Mysqlx_stmt_execute_sql | 0 |
| Mysqlx_stmt_execute_xplugin | 0 |
| Mysqlx_stmt_get_collection_options | 0 |
| Mysqlx_stmt_kill_client | 0 |
| Mysqlx_stmt_list_clients | 0 |
| Mysqlx_stmt_list_notices | 0 |
| Mysqlx_stmt_list_objects | 0 |
| Mysqlx_stmt_modify_collection_options | 0 |
| Mysqlx_stmt_ping | 0 |
| Mysqlx_worker_threads | 2 |
| Mysqlx_worker_threads_active | 0 |
| Not_flushed_delayed_rows | 0 |
| Ongoing_anonymous_transaction_count | 0 |
| Open_files | 6 |
| Open_streams | 0 |
| Open_table_definitions | 176 |
| Open_tables | 325 |
| Opened_files | 6 |
| Opened_table_definitions | 0 |
| Opened_tables | 0 |
| Performance_schema_accounts_lost | 0 |
| Performance_schema_cond_classes_lost | 0 |
| Performance_schema_cond_instances_lost | 0 |
| Performance_schema_digest_lost | 0 |
| Performance_schema_file_classes_lost | 0 |
| Performance_schema_file_handles_lost | 0 |
| Performance_schema_file_instances_lost | 0 |
| Performance_schema_hosts_lost | 0 |
| Performance_schema_index_stat_lost | 0 |
| Performance_schema_locker_lost | 0 |
| Performance_schema_memory_classes_lost | 0 |
| Performance_schema_metadata_lock_lost | 0 |
| Performance_schema_mutex_classes_lost | 0 |
| Performance_schema_mutex_instances_lost | 0 |
| Performance_schema_nested_statement_lost | 0 |
| Performance_schema_prepared_statements_lost | 0 |
| Performance_schema_program_lost | 0 |
| Performance_schema_rwlock_classes_lost | 0 |
| Performance_schema_rwlock_instances_lost | 0 |
| Performance_schema_session_connect_attrs_longest_seen | 117 |
| Performance_schema_session_connect_attrs_lost | 0 |
| Performance_schema_socket_classes_lost | 0 |
| Performance_schema_socket_instances_lost | 0 |
| Performance_schema_stage_classes_lost | 0 |
| Performance_schema_statement_classes_lost | 0 |
| Performance_schema_table_handles_lost | 0 |
| Performance_schema_table_instances_lost | 0 |
| Performance_schema_table_lock_stat_lost | 0 |
| Performance_schema_thread_classes_lost | 0 |
| Performance_schema_thread_instances_lost | 0 |
| Performance_schema_users_lost | 0 |
| Prepared_stmt_count | 0 |
| Queries | 269 |
| Questions | 2 |
| Replica_open_temp_tables | 0 |
| Resource_group_supported | ON |
| Rsa_public_key | -----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtV9pQFfRgnehmEpaus5+
FHb6ZzZW8akQcn3gW8FC4wrpbO7tn/d0Fs9tF4dgHUN6eFJb8YvbD4ApBsttsGQt
fSTGLH1cHGb9DVrzNNssdmVxAAUCSLrOYkqOK1iC1zafKG2wOjkts7CWVEQ5J8ol
e80ET+pc+rRimL2OgOrUhyeB8W5tqpT69RwhZEM0SS1FVoVnJE2iCl32X4nt0Njv
cjXp1XbkSftjRpm8oUlH3wej+9jGGtRV5uBG7+NVUQt20hKvEb8F9NLFv4z9wnTG
oEMUlJOFUn5/yxvmgyMyKcYSaMav13+CqvzC5CzCafVAkNh+V/egylJ3EDDa6Jl6
qQIDAQAB
-----END PUBLIC KEY-----
|
| Secondary_engine_execution_count | 0 |
| Select_full_join | 0 |
| Select_full_range_join | 0 |
| Select_range | 0 |
| Select_range_check | 0 |
| Select_scan | 0 |
| Slave_open_temp_tables | 0 |
| Slow_launch_threads | 0 |
| Slow_queries | 0 |
| Sort_merge_passes | 0 |
| Sort_range | 0 |
| Sort_rows | 0 |
| Sort_scan | 0 |
| Ssl_accept_renegotiates | 0 |
| Ssl_accepts | 0 |
| Ssl_callback_cache_hits | 0 |
| Ssl_cipher | |
| Ssl_cipher_list | |
| Ssl_client_connects | 0 |
| Ssl_connect_renegotiates | 0 |
| Ssl_ctx_verify_depth | 18446744073709551615 |
| Ssl_ctx_verify_mode | 5 |
| Ssl_default_timeout | 0 |
| Ssl_finished_accepts | 0 |
| Ssl_finished_connects | 0 |
| Ssl_server_not_after | Mar 23 00:59:48 2033 GMT |
| Ssl_server_not_before | Mar 26 00:59:48 2023 GMT |
| Ssl_session_cache_hits | 0 |
| Ssl_session_cache_misses | 0 |
| Ssl_session_cache_mode | SERVER |
| Ssl_session_cache_overflows | 0 |
| Ssl_session_cache_size | 128 |
| Ssl_session_cache_timeout | 300 |
| Ssl_session_cache_timeouts | 0 |
| Ssl_sessions_reused | 0 |
| Ssl_used_session_cache_entries | 0 |
| Ssl_verify_depth | 0 |
| Ssl_verify_mode | 0 |
| Ssl_version | |
| Table_locks_immediate | 52 |
| Table_locks_waited | 0 |
| Table_open_cache_hits | 0 |
| Table_open_cache_misses | 0 |
| Table_open_cache_overflows | 0 |
| Tc_log_max_pages_used | 0 |
| Tc_log_page_size | 0 |
| Tc_log_page_waits | 0 |
| Telemetry_traces_supported | ON |
| Threads_cached | 2 |
| Threads_connected | 1 |
| Threads_created | 3 |
| Threads_running | 2 |
| Tls_library_version | OpenSSL 3.0.2 15 Mar 2022 |
| Uptime | 192758 |
| Uptime_since_flush_status | 192758 |
+-------------------------------------------------------+-----------------------------------------------+
497 rows in set (0.00 sec)
mysql>
关于各个状态变量的含义可以参考如下官方文档的解释。
5.1.10 Server Status Variables
https://dev.mysql.com/doc/refman/8.0/en/server-status-variables.html
5.1.10 Server Status Variables
https://dev.mysql.com/doc/refman/8.0/en/server-status-variables.html
5.1.6 Server Status Variable Reference
https://dev.mysql.com/doc/refman/8.0/en/server-status-variable-reference.html
13.7.7.37 SHOW STATUS Statement
https://dev.mysql.com/doc/refman/8.0/en/show-status.html