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https://dev.mysql.com/doc/refman/8.0/en/table-cache.html
When the table cache fills up, the server uses the following procedure to locate a cache entry to use: Tables not currently in use are released, beginning with the table least recently used. When you execute a mysqladmin status command, you should ...
https://dev.mysql.com/doc/refman/8.0/en/upgrade-best-practices.html
MySQL supports upgrading between minor versions (within an LTS series) and to the next major version (across an LTS series). LTS releases have 8+ years of support and are meant for production use. Performing a minor version upgrade is ...
https://dev.mysql.com/doc/refman/8.0/en/using-stack-trace.html
On some operating systems, the error log contains a stack trace if mysqld dies unexpectedly. You can use this to find out where (and maybe why) mysqld died. To get a stack trace, you must not compile mysqld with the -fomit-frame-pointer option to ...
https://dev.mysql.com/doc/refman/8.0/en/using-systemd.html
If you install MySQL from a source distribution on a platform that uses systemd, obtain systemd support for MySQL by configuring the distribution using the -DWITH_SYSTEMD=1 CMake option. The following discussion covers these topics: Overview of ...
https://dev.mysql.com/doc/refman/8.0/en/while.html
Example: CREATE PROCEDURE dowhile() BEGIN DECLARE v1 INT DEFAULT 5; WHILE v1 > 0 DO ... [begin_label:] WHILE search_condition DO statement_list END WHILE [end_label] The statement list within a WHILE statement is repeated as long as the ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-system-monitoring.html
This is important, because if you instead try to switch to SQL mode, the procedure shows the result of this operation rather than the X DevAPI operation. For general X Plugin monitoring, use the status variables that it exposes. For information ...
https://dev.mysql.com/doc/refman/8.0/en/diagnostics-area.html
The following example shows the effect of various statements on the diagnostics area, using SHOW WARNINGS to display information about conditions stored there. Diagnostics areas are pushed to and popped from the stack under the following ... SQL ...
https://dev.mysql.com/doc/refman/8.0/en/exists-and-not-exists-subqueries.html
If a subquery returns any rows at all, EXISTS subquery is TRUE, and NOT EXISTS subquery is FALSE. For example: SELECT column1 FROM t1 WHERE EXISTS (SELECT * FROM t2); Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-internals.html
InnoDB Data Storage and Compression All user data in InnoDB tables is stored in pages comprising a B-tree index (the clustered index). The compression of B-tree nodes (of both clustered and secondary indexes) is handled differently from compression ... This section describes some internal implementation details about compression for InnoDB ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-service.html
MySQL Server supports a keyring service that enables internal components and plugins to securely store sensitive information for later retrieval. This section describes how to use the keyring service functions to store, retrieve, and remove keys in ...MySQL distributions provide a keyring interface that is accessible at two levels: At the SQL level, as a set of loadable functions that each map onto calls to the service ...