https://dev.mysql.com/replication-solutions-performance.html
With this option, replication instructions from Master 1 are also written to Master 2's binary log so that they can then be replicated to the true slaves. As the number of slaves connecting to a master increases, the load, although minimal, also ...
https://dev.mysql.com/replication-solutions-switch.html
When this is true for all slaves, they can be reconfigured to the new setup. You can tell a slave to change to a new master using the CHANGE MASTER TO statement. The slave does not check whether the databases on the master are compatible with those ...
https://dev.mysql.com/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/row-subqueries.html
If this row has col3 and col4 values equal to the col1 and col2 values of any rows in t1, the WHERE expression is TRUE and each query returns those t1 rows. Scalar or column subqueries return a single value or a column of values. A row subquery is ...
https://dev.mysql.com/select.html
where_condition is an expression that evaluates to true for each row to be selected. SELECT [ALL | DISTINCT | DISTINCTROW ] [HIGH_PRIORITY] [STRAIGHT_JOIN] [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT] [SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS] ...
https://dev.mysql.com/server-error-reference.html
Error number: MY-011211; Symbol: ER_AUDIT_LOG_RENAME_LOG_FILE_BEFORE_FLUSH; SQLSTATE: HY000 Message: Audit log file (%s) must be manually renamed before audit_log_flush is set to true. The MySQL server writes some error messages to its error log, ...
https://dev.mysql.com/set-variable.html
Most of the examples show SET statements that use keyword syntax (for example, GLOBAL or SESSION), but the principles are also true for statements that use the corresponding modifiers (for example, @@GLOBAL. variable: { user_var_name | param_name | ...
https://dev.mysql.com/setup-instruments-table.html
This affects primarily mutexes, conditions, and rwlocks in the server, although there may be other instruments for which this is true. The setup_instruments table lists classes of instrumented objects for which events can be collected: mysql> ...
https://dev.mysql.com/show-slave-status.html
SHOW SLAVE STATUS [FOR CHANNEL channel] This statement provides status information on essential parameters of the slave threads. When run concurrently with STOP SLAVE, SHOW SLAVE STATUS returns without waiting for STOP SLAVE to finish shutting down ...
https://dev.mysql.com/show-table-status.html
(This is also true if the InnoDB table is partitioned.) Avg_row_length The average row length. 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 ...
