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https://dev.mysql.com/doc/refman/8.4/en/performance-schema-log-status-table.html
The log_status table provides information that enables an online backup tool to copy the required log files without locking those resources for the duration of the copy process. When the log_status table is queried, the server blocks logging and ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-metadata-locks-table.html
Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, functions, triggers, scheduled events), tablespaces, user locks acquired with the GET_LOCK() function (see Section 14.14, “Locking Functions”), and ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-socket-instances-table.html
The socket_instances table provides a real-time snapshot of the active connections to the MySQL server. The table contains one row per TCP/IP or Unix socket file connection. Information available in this table provides a real-time snapshot of the ...row *************************** EVENT_NAME: wait/io/socket/sql/server_unix_socket OBJECT_INSTANCE_BEGIN: 4316619408 THREAD_ID: 1 SOCKET_ID: 16 IP: PORT: 0 STATE: ACTIVE *************************** ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-tp-thread-state-table.html
The tp_thread_state table has one row per thread created by the thread pool to handle connections. The tp_thread_state table has these columns: TP_GROUP_ID The thread group ID. TP_GROUP_ID and TP_THREAD_NUMBER together provide a unique key within ...PROCESS_COUNT The 10ms interval in which the statement that uses this thread is currently ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-wait-tables.html
These tables store wait events: events_waits_current: The current wait event for each thread. There are also summary tables that aggregate information about wait events; see Section 29.12.20.1, “Wait Event Summary Tables”. For more information ... The Performance Schema instruments waits, which are events that take ...
https://dev.mysql.com/doc/refman/8.4/en/repair-table-optimization.html
REPAIR TABLE for MyISAM tables is similar to using myisamchk for repair operations, and some of the same performance optimizations apply: myisamchk has variables that control memory allocation. For REPAIR TABLE, the same principle applies, but ...
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/backup-history-table-update.html
Rename the original mysql.backup_history table to mysql.backup_history_old, and the mysql.backup_history_new table to mysql.backup_history. Note If you are working with a multiprimary Group Replication setting, make sure these privileges are granted ...
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/backup-sbt-history-table-update.html
Rename the original mysql.backup_sbt_history table to mysql.backup_sbt_history_old, and the mysql.backup_sbt_history_new table to mysql.backup_sbt_history. Note If you are working with a multiprimary Group Replication setting, make sure these ...
https://dev.mysql.com/doc/mysqld-version-reference/en/information-schema-tables.html
The following table shows all INFORMATION_SCHEMA tables available in MySQL Server. An item has a row in the table if it ever existed in any series shown in the table. Introduced: The version or versions in which the item was introduced. Deprecated: ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-replication-applier-status-by-coordinator-table.html
For a multithreaded replica, the replica uses multiple worker threads and a coordinator thread to manage them, and this table shows the status of the coordinator thread. For a multithreaded replica, the replication_applier_status_by_worker table ...