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https://dev.mysql.com/doc/refman/8.0/en/parenthesized-query-expressions.html
| TABLE | VALUES order_by_clause: ORDER BY as for SELECT limit_clause: LIMIT as for SELECT into_clause: INTO as for SELECT set_op: UNION | INTERSECT | EXCEPT MySQL 8.0.22 and higher supports parenthesized query expressions according to the preceding ... parenthesized_query_expression: ( query_expression [order_by_clause] [limit_clause] ) [order_by_clause] [limit_clause] [into_clause] query_expression: query_block [set_op query_block [set_op query_block ...]] [order_by_clause] [limit_clause] [into_clause] query_block: SELECT ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-examples.html
The following example provides one methodology that you can use to analyze a repeatable problem, such as investigating a performance bottleneck. To begin, you should have a repeatable use case where performance is deemed “too slow” and needs ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instrument-filtering.html
The setup_instruments table lists the available instruments: mysql> SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments; +---------------------------------------------------+---------+-------+ | NAME | ENABLED | TIMED | ...| ...
https://dev.mysql.com/doc/refman/8.0/en/replication-administration-skip.html
Details of the error and the last successfully applied transaction are recorded in the Performance Schema table replication_applier_status_by_worker. This method of skipping transactions is not suitable when you have enabled GTID assignment on a ...
https://dev.mysql.com/doc/refman/8.0/en/replication-delayed.html
The replication_applier_configuration Performance Schema table contains the DESIRED_DELAY column which shows the delay configured using the SOURCE_DELAY | MASTER_DELAY option. The replication_applier_status Performance Schema table contains the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-views.html
Views are filtered by their own name, not by the tables they refer to. This means that a view can be replicated to the replica even if the view contains a table that would normally be filtered out by replication-ignore-table rules. Care should ...
https://dev.mysql.com/doc/refman/8.0/en/rewriter-query-rewrite-plugin.html
The Rewriter plugin uses a database named query_rewrite containing a table named rewrite_rules. The table provides persistent storage for the rules that the plugin uses to decide whether to rewrite statements. Users communicate with the plugin by ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-prerequisites.html
Before using the sys schema, the prerequisites described in this section must be satisfied. Because the sys schema provides an alternative means of accessing the Performance Schema, the Performance Schema must be enabled for the sys schema to work.
https://dev.mysql.com/doc/refman/8.0/en/unix-signal-response.html
SIGHUP causes the server to reload the grant tables and to flush tables, logs, the thread cache, and the host cache. On Unix and Unix-like systems, a process can be the recipient of signals sent to it by the root system account or the system ...
https://dev.mysql.com/doc/refman/8.0/en/constant-folding-optimization.html
Consider the table created by the following statement: CREATE TABLE t (c TINYINT UNSIGNED NOT NULL); The WHERE condition in the query SELECT * FROM t WHERE c < 256 contains the integral constant 256 which is out of range for a TINYINT UNSIGNED ...