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https://dev.mysql.com/doc/refman/8.4/en/performance-schema-processlist-table.html
The MySQL process list indicates the operations currently being performed by the set of threads executing within the server. For a comparison of this table with other sources, see Sources of Process Information. If you have the PROCESS privilege, ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-replication-applier-filters-table.html
This table shows the replication channel specific filters configured on this replica. Each row provides information on a replication channel's configured type of filter. The replication_applier_filters table has these columns: CHANNEL_NAME The name ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-replication-applier-global-filters-table.html
This table shows the global replication filters configured on this replica. The replication_applier_global_filters table has these columns: FILTER_NAME The type of replication filter that has been configured. FILTER_RULE The rules configured for ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-replication-tables.html
This is similar to the information available from the SHOW REPLICA STATUS statement, but representation in table form is more accessible and has usability benefits: SHOW REPLICA STATUS output is useful for visual inspection, but not so much for ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-threads-table.html
The threads table contains a row for each server thread. Each row contains information about a thread and indicates whether monitoring and historical event logging are enabled for it: mysql> SELECT * FROM performance_schema.threads\G ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-tp-thread-group-state-table.html
The tp_thread_group_state table has one row per thread group in the thread pool. Each row provides information about the current state of a group. The tp_thread_group_state table has these columns: TP_GROUP_ID The thread group ID. There is at most ...
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 ...
https://dev.mysql.com/doc/refman/8.4/en/problems-with-null.html
The concept of the NULL value is a common source of confusion for newcomers to SQL, who often think that NULL is the same thing as an empty string ''. For example, the following statements are completely different: mysql> INSERT INTO my_table ...
https://dev.mysql.com/doc/refman/8.4/en/query-log.html
The general query log is a general record of what mysqld is doing. The server writes information to this log when clients connect or disconnect, and it logs each SQL statement received from clients. The general query log can be very useful when you ...
https://dev.mysql.com/doc/refman/8.4/en/repair-table.html
[QUICK] [EXTENDED] [USE_FRM] REPAIR TABLE repairs a possibly corrupted table, for certain storage engines only. Although normally you should never have to run REPAIR TABLE, if disaster strikes, this statement is very likely to get back all your data ...