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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-digests.html
The MySQL server is capable of maintaining statement digest information. Digesting occurs in the parser regardless of whether the Performance Schema is available, so that other features such as MySQL Enterprise Firewall and query rewrite plugins ...
https://dev.mysql.com/doc/refman/8.0/en/events-overview.html
MySQL Events are tasks that run according to a schedule. When you create an event, you are creating a named database object containing one or more SQL statements to be executed at one or more regular intervals, beginning and ending at a specific ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-internals.html
mysql> USE innodb_memcache; Database changed mysql> SHOW TABLES; +---------------------------+ | Tables_in_innodb_memcache | +---------------------------+ | cache_policies | | config_options | | containers | +---------------------------+ ... InnoDB ...
https://dev.mysql.com/doc/refman/8.0/en/show-processlist.html
SHOW [FULL] PROCESSLIST Important The INFORMATION SCHEMA implementation of SHOW PROCESSLIST is deprecated and subject to removal in a future MySQL release. The MySQL process list indicates the operations currently being performed by the set of ...
https://dev.mysql.com/doc/refman/8.0/en/nested-loop-joins.html
MySQL executes joins between tables using a nested-loop algorithm or variations on it. Nested-Loop Join Algorithm Block Nested-Loop Join Algorithm Nested-Loop Join Algorithm A simple nested-loop join (NLJ) algorithm reads rows from the first table ...For example, if 10 rows are read into a buffer and the buffer is passed to the next inner loop, each row read in the inner loop can be compared against all 10 rows in the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-triggers.html
If an upgraded replication source server still has old replicas using MySQL versions that do not support multiple triggers, an error occurs on those replicas if a trigger is created on the source for a table that already has a trigger with the same ...It is sufficient to switch to statement-based replication only for those statements where you want this effect, and to use row-based replication the rest of the ...
https://dev.mysql.com/doc/refman/8.0/en/general-thread-states.html
The flag is checked in each major loop in MySQL, but in some cases it might still take a short time for the thread to die. The temporary result set has become too large (see Section 10.4.4, “Internal Temporary Table Use in MySQL”). Killed ...
https://dev.mysql.com/doc/refman/8.0/en/myisampack.html
MySQL uses mmap() when possible to perform memory mapping on compressed tables. If mmap() does not work, MySQL falls back to normal read/write file operations. Please note the following: If the mysqld server was invoked with external locking ...When ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-range.html
(See Bug #42849.) Note It is also possible in MySQL 8.0 to use UNIX_TIMESTAMP(timestamp_column) as a partitioning expression for tables that are partitioned by LIST. However, MySQL must be able to evaluate the expression's return value as part of a ... A table that is partitioned by range is partitioned in such a way that each partition contains rows for which the partitioning expression value lies within a given ...
https://dev.mysql.com/doc/refman/8.0/en/disk-issues.html
This makes both the seek and read times better, assuming that the disk is not used for other purposes as well. RAID N can be a problem if you have many writes, due to the time required to update the parity bits. You can also set the parameters for ... This section describes ways to configure storage devices when you can devote more and faster storage hardware to the database ...