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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-build-configuration.html
If you install MySQL over a previous installation that was configured without the Performance Schema (or with an older version of the Performance Schema that has missing or out-of-date tables). One indication of this issue is the presence of ...It ...
https://dev.mysql.com/doc/refman/8.0/en/regexp.html
For example, it can be specified as a string expression or table column. This section discusses the functions and operators available for regular expression matching and illustrates, with examples, some of the special characters and constructs that ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-sql-mode.html
If you are replicating partitioned tables, using different SQL modes on the source and the replica is likely to cause issues. At a minimum, this is likely to cause the distribution of data among partitions to be different in the source's and ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-transaction-inconsistencies.html
A transaction which updates non-transactional tables has applied some but not all of its changes. STOP REPLICA when the ongoing transaction updates transactional tables only, in which case it is rolled back and STOP REPLICA stops immediately. The ...
https://dev.mysql.com/doc/refman/8.0/en/replication-semisync.html
Blocking also occurs after rollbacks that are written to the binary log, which occurs when a transaction that modifies nontransactional tables is rolled back. The rolled-back transaction is logged even though it has no effect for transactional ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-rbr-monitoring.html
When these Performance Schema instrument stages are enabled the events_stages_current table shows stages for applier threads and their progress. For background information, see Section 29.12.5, “Performance Schema Stage Event Tables”. The ...
https://dev.mysql.com/doc/refman/8.0/en/reset-persist.html
RESET PERSIST affects the contents of the Performance Schema persisted_variables table because the table contents correspond to the contents of the mysqld-auto.cnf file. On the other hand, because RESET PERSIST does not change variable values, it ...
https://dev.mysql.com/doc/refman/8.0/en/row-subqueries.html
Scalar or column subqueries return a single value or a column of values. A row subquery is a subquery variant that returns a single row and can thus return more than one column value. If this row has col3 and col4 values equal to the col1 and col2 ...
https://dev.mysql.com/doc/refman/8.0/en/selecting-rows.html
As shown in the preceding section, it is easy to retrieve an entire table. But typically you don't want to see the entire table, particularly when it becomes large. Instead, you're usually more interested in answering a particular question, in ...
https://dev.mysql.com/doc/refman/8.0/en/server-status-variable-reference.html
The following table lists all status variables applicable within mysqld. The last column indicates whether the scope for each variable is Global, Session, or both. Please see the corresponding item descriptions for details on setting and using the ...