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https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-replication-auto-sync.html
It is possible to automate much of the process described in the previous section (see Section 25.7.9, “NDB Cluster Backups With NDB Cluster Replication”). The following Perl script reset-replica.pl serves as an example of how you can do this.
https://dev.mysql.com/doc/refman/8.4/en/partitioning.html
See Section 28.3.21, “The INFORMATION_SCHEMA PARTITIONS Table”, for more information; for some examples of queries against this table, see Section 26.2.7, “How MySQL Partitioning Handles NULL”. Note Table partitioning differs from ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-connection-tables.html
The Performance Schema also counts internal threads and threads for user sessions that failed to authenticate, using rows with USER and HOST column values of NULL. When a client connects to the MySQL server, it does so under a particular user name ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-consumer-filtering.html
Conversely, you can get detailed statements in events_statements_current without digests (the DIGEST and DIGEST_TEXT columns are NULL in this case). To enable or disable a consumer, set its ENABLED value to YES or NO. If you disable a consumer, the ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-hosts-table.html
This is NULL for an internal thread, or for a user session that failed to authenticate. The hosts table contains a row for each host from which clients have connected to the MySQL server. For each host name, the table counts the current and total ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-performance-timers-table.html
For an explanation of how event timing occurs, see Section 29.4.1, “Performance Schema Event Timing”. For a cycle timer, the frequency is generally related to the CPU speed. For example, on a system with a 2.4GHz processor, the CYCLE may be ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-queries.html
Pre-filtering limits which event information is collected and is independent of any particular user. By contrast, post-filtering is performed by individual users through the use of queries with appropriate WHERE clauses that restrict what event ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-replication-applier-status-table.html
This table shows the current general transaction execution status on the replica. The table provides information about general aspects of transaction applier status that are not specific to any thread involved. Thread-specific status information is ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-restrictions.html
If the values in this table for a given timer name are NULL, that timer is not supported on your platform. The Performance Schema avoids using mutexes to collect or produce data, so there are no guarantees of consistency and results can sometimes ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-rwlock-instances-table.html
WRITE_LOCKED_BY_THREAD_ID When a thread currently has an rwlock locked in exclusive (write) mode, WRITE_LOCKED_BY_THREAD_ID is the THREAD_ID of the locking thread, otherwise it is NULL. The rwlock_instances table lists all the rwlock (read write ...