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https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-performance.html
As the number of replicas connecting to a source increases, the load, although minimal, also increases, as each replica uses a client connection to the source. Also, as each replica must receive a full copy of the source's binary log, the network ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-switch.html
You can tell a replica to change to a new source using the CHANGE REPLICATION SOURCE TO statement (prior to MySQL 8.0.23: CHANGE MASTER TO. The replica does not check whether the databases on the source are compatible with those on the replica; it ...
https://dev.mysql.com/doc/refman/8.0/en/restart.html
One use for RESTART is when it is not possible or convenient to gain command-line access to the MySQL server on the server host to restart it. For example, SET PERSIST_ONLY can be used at runtime to make configuration changes to system variables ...
https://dev.mysql.com/doc/refman/8.0/en/reusing-ssl-sessions.html
As of MySQL 8.0.29, MySQL client programs may elect to resume a prior SSL session, provided that the server has the session in its runtime cache. This section describes the conditions that are favorable for SSL session reuse, the server variables ...
https://dev.mysql.com/doc/refman/8.0/en/rewriter-query-rewrite-plugin-usage.html
To enable or disable the plugin, enable or disable the rewriter_enabled system variable. By default, the Rewriter plugin is enabled when you install it (see Section 7.6.4.1, “Installing or Uninstalling the Rewriter Query Rewrite Plugin”). To ...
https://dev.mysql.com/doc/refman/8.0/en/row-subqueries.html
Scalar or column subqueries return a single value or a column of values. A row subquery is a subquery variant that returns a single row and can thus return more than one column value. If this row has col3 and col4 values equal to the col1 and col2 ...
https://dev.mysql.com/doc/refman/8.0/en/select.html
SELECT [ALL | DISTINCT | DISTINCTROW ] [HIGH_PRIORITY] [STRAIGHT_JOIN] [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT] [SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS] select_expr [, select_expr] ... [into_option] [FROM table_references [PARTITION ...
https://dev.mysql.com/doc/refman/8.0/en/set-variable.html
variable: { user_var_name | param_name | local_var_name | {GLOBAL | @@GLOBAL.} system_var_name | {PERSIST | @@PERSIST.} system_var_name | {PERSIST_ONLY | @@PERSIST_ONLY.} system_var_name | [SESSION | @@SESSION. | @@] system_var_name } SET syntax for ...
https://dev.mysql.com/doc/refman/8.0/en/show-replica-status.html
SHOW {REPLICA | SLAVE} STATUS [FOR CHANNEL channel] This statement provides status information on essential parameters of the replica threads. From MySQL 8.0.22, use SHOW REPLICA STATUS in place of SHOW SLAVE STATUS, which is deprecated from that ...
https://dev.mysql.com/doc/refman/8.0/en/show-table-status.html
SHOW TABLE STATUS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLE STATUS works likes SHOW TABLES, but provides a lot of information about each non-TEMPORARY table. You can also get this list using the mysqlshow --status db_name ...