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https://dev.mysql.com/doc/refman/5.7/en/query-cache-status-and-maintenance.html
Note The query cache is deprecated as of MySQL 5.7.20, and is removed in MySQL 8.0. To check whether the query cache is present in your MySQL server, use the following statement: mysql> SHOW VARIABLES LIKE 'have_query_cache'; ...
https://dev.mysql.com/doc/refman/5.7/en/regexp.html
Table 12.14 Regular Expression Functions and Operators Name Description NOT REGEXP Negation of REGEXP REGEXP Whether string matches regular expression RLIKE Whether string matches regular expression A regular expression is a powerful way of ...
https://dev.mysql.com/doc/refman/5.7/en/repair-table-optimization.html
REPAIR TABLE for MyISAM tables is similar to using myisamchk for repair operations, and some of the same performance optimizations apply: myisamchk has variables that control memory allocation. You may be able to its improve performance by setting ...
https://dev.mysql.com/doc/refman/5.7/en/replication-channels.html
In MySQL multi-source replication, a replica opens multiple replication channels, one for each replication source server. The replication channels represent the path of transactions flowing from a source to the replica. Each replication channel has ...
https://dev.mysql.com/doc/refman/5.7/en/resignal.html
RESIGNAL may change some or all information before passing it on. RESIGNAL is related to SIGNAL, but instead of originating a condition as SIGNAL does, RESIGNAL relays existing condition information, possibly after modifying it. RESIGNAL makes it ...
https://dev.mysql.com/doc/refman/5.7/en/string-literals.html
A string is a sequence of bytes or characters, enclosed within either single quote (') or double quote (") characters. Examples: 'a string' "another string" Quoted strings placed next to each other are concatenated to a single string. The following ...
https://dev.mysql.com/doc/refman/5.7/en/triggers.html
A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table. Some uses for triggers are to perform checks of values to be inserted into a table or to perform calculations on ...
https://dev.mysql.com/doc/refman/5.7/en/windows-restrictions.html
The following restrictions apply to use of MySQL on the Windows platform: Process memory On Windows 32-bit platforms, it is not possible by default to use more than 2GB of RAM within a single process, including MySQL. This is because the physical ...
https://dev.mysql.com/doc/refman/5.7/en/mysqld-multi.html
mysqld_multi searches for groups named [mysqldN] in my.cnf (or in the file named by the --defaults-file option). This number is referred to in the following discussion as the option group number, or GNR. Group numbers distinguish option groups from ... mysqld_multi is designed to manage several mysqld processes that listen for connections on different Unix socket files and TCP/IP ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-mgm-client-commands.html
CREATE NODEGROUP nodeid[, nodeid, ...] Creates a new NDB Cluster node group and causes data nodes to join it. This command is used after adding new data nodes online to an NDB Cluster, and causes them to join a new node group and thus to begin ...