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https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-diskio.html
If you follow best practices for database design and tuning techniques for SQL operations, but your database is still slow due to heavy disk I/O activity, consider these disk I/O optimizations. If the Unix top tool or the Windows Task Manager shows ...
https://dev.mysql.com/doc/refman/5.7/en/repeat.html
[begin_label:] REPEAT statement_list UNTIL search_condition END REPEAT [end_label] The statement list within a REPEAT statement is repeated until the search_condition expression is true. statement_list consists of one or more statements, each ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-variables.html
sql_mode is also replicated except for the NO_DIR_IN_CREATE mode; the replica always preserves its own value for NO_DIR_IN_CREATE, regardless of changes to it on the source. However, when mysqlbinlog parses a SET @@sql_mode = mode statement, the ...
https://dev.mysql.com/doc/refman/5.7/en/replication-semisync-installation.html
Semisynchronous replication is implemented using plugins, so the plugins must be installed into the server to make them available. After a plugin has been installed, you control it by means of the system variables associated with it. These system ...
https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html
If no comparison or condition is true, the result after ELSE is returned, or NULL if there is no ELSE part. The CASE statement cannot have an ELSE NULL clause, and it is terminated with END CASE instead of END. If only one of expr2 or expr3 is ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-row-format.html
An SQL NULL value reserves one or two bytes in the record directory. An SQL NULL value reserves zero bytes in the data part of the record if stored in a variable-length column. Reserving fixed space for NULL values permits columns to be updated in ... The row format of a table determines how its rows are physically stored, which in turn can affect the performance of queries and DML ...
https://dev.mysql.com/doc/refman/5.7/en/ldap-pluggable-authentication.html
Note LDAP pluggable authentication is an extension included in MySQL Enterprise Edition, a commercial product. As of MySQL 5.7.19, MySQL Enterprise Edition supports an authentication method that enables MySQL Server to use LDAP (Lightweight ...
https://dev.mysql.com/doc/refman/5.7/en/keyring-functions-general-purpose.html
If the key cannot be created, the return value is NULL and an error occurs. mysql> SELECT @x; +------+ | @x | +------+ | NULL | +------+ mysql> SELECT keyring_key_generate('x', 'AES', 16) INTO @x; mysql> SELECT @x; +------+ | @x | +------+ | 1 | ...
https://dev.mysql.com/doc/refman/5.7/en/dynamic-system-variables.html
Many server system variables are dynamic and can be set at runtime. For a description of the privilege requirements for setting system variables, see Section 5.1.8.1, “System Variable Privileges” The following table lists all dynamic system ...
https://dev.mysql.com/doc/refman/5.7/en/gis-class-geometry.html
Exterior, interior, and boundary of an empty geometry are not defined (that is, they are represented by a NULL value). It is a noninstantiable class but has a number of properties, described in the following list, that are common to all geometry ...