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https://dev.mysql.com/doc/refman/9.7/en/multiple-key-caches.html
Note As of MySQL 9.7, the compound-part structured-variable syntax discussed here for referring to multiple MyISAM key caches is deprecated. Shared access to the key cache improves performance but does not eliminate contention among sessions ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-statement-tables.html
Statement events occur at a high level of the event hierarchy. Within the event hierarchy, wait events nest within stage events, which nest within statement events, which nest within transaction events. These tables store statement events: ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-system-variables.html
The Performance Schema automatically sizes the values of several of its parameters at server startup if they are not set explicitly. Performance Schema system variables have the following meanings: performance_schema Command-Line Format ...
https://dev.mysql.com/doc/refman/9.7/en/merge-table-problems.html
The following are known problems with MERGE tables: MERGE child tables are locked through the parent table. If the parent is temporary, it is not locked, and thus the child tables are also not locked; this means that parallel use of the underlying ...
https://dev.mysql.com/doc/refman/9.7/en/show-create-view.html
SHOW CREATE VIEW view_name This statement shows the CREATE VIEW statement that creates the named view. row *************************** View: v Create View: CREATE ALGORITHM=UNDEFINED DEFINER=`bob`@`localhost` SQL SECURITY DEFINER VIEW `v` AS select ...
https://dev.mysql.com/doc/refman/9.7/en/with.html
A common table expression (CTE) is a named temporary result set that exists within the scope of a single statement and that can be referred to later within that statement, possibly multiple times. The following discussion describes how to write ...
https://dev.mysql.com/doc/refman/9.7/en/window-function-optimization.html
Window functions affect the strategies the optimizer considers: Derived table merging for a subquery is disabled if the subquery has window functions. Semijoins are not applicable to window function optimization because semijoins apply to ...
https://dev.mysql.com/doc/refman/9.7/en/upgrade-binary-package.html
This section describes how to upgrade MySQL binary and package-based installations on Unix/Linux. In-Place Upgrade Logical Upgrade MySQL Cluster Upgrade In-Place Upgrade An in-place upgrade involves shutting down the old MySQL server, replacing the ...
https://dev.mysql.com/doc/refman/9.7/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.27, “CREATE TRIGGER Statement”, and Section 15.1.41, “DROP TRIGGER Statement”. Here is a simple example that associates a ...
https://dev.mysql.com/doc/refman/9.7/en/table-locking.html
InnoDB tables use row-level locking so that multiple sessions and applications can read from and write to the same table simultaneously, without making each other wait or producing inconsistent results. For this storage engine, avoid using the LOCK ...