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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-cond-instances-table.html
The cond_instances table lists all the conditions seen by the Performance Schema while the server executes. A condition is a synchronization mechanism used in the code to signal that a specific event has happened, so that a thread waiting for this ...
https://dev.mysql.com/doc/refman/5.7/en/return.html
RETURN expr The RETURN statement terminates execution of a stored function and returns the value expr to the function caller. There must be at least one RETURN statement in a stored function. There may be more than one if the function has multiple ...
https://dev.mysql.com/doc/refman/5.7/en/key-cache-restructuring.html
A key cache can be restructured at any time by updating its parameter values. File system caching is not as efficient as using a key cache, so although queries execute, a slowdown can be anticipated. For example: mysql> SET GLOBAL ...
https://dev.mysql.com/doc/refman/5.7/en/precision-math-decimal-characteristics.html
This section discusses the characteristics of the DECIMAL data type (and its synonyms), with particular regard to the following topics: Maximum number of digits Storage format Storage requirements The nonstandard MySQL extension to the upper range ...D is the number of digits to the right of the decimal point (the ...
https://dev.mysql.com/doc/refman/5.7/en/shutdown.html
Because status variables are initialized for each server startup and do not persist across restarts, Com_shutdown normally has a value of zero, but can be nonzero if SHUTDOWN statements were executed but failed. SHUTDOWN provides an SQL-level ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-filtering.html
As of MySQL 5.7.20, filter rules have the capability of blocking (aborting) execution of qualifying events, in addition to existing capabilities for event logging. Constraints on Audit Log Filtering Functions Audit log filtering functions are ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-backup-troubleshooting.html
If an error code is returned when issuing a backup request, the most likely cause is insufficient memory or disk space. You should check that there is enough memory allocated for the backup. Important If you have set BackupDataBufferSize and ...
https://dev.mysql.com/doc/refman/5.7/en/replication-setup-replicas.html
To do this, execute the following statement on the replica, replacing the option values with the actual values relevant to your system: mysql> CHANGE MASTER TO -> MASTER_HOST='source_host_name', -> MASTER_USER='replication_user_name', -> ...Before ...
https://dev.mysql.com/doc/refman/5.7/en/constraints.html
The basic philosophy is that MySQL Server tries to produce an error for anything that it can detect while parsing a statement to be executed, and tries to recover from any errors that occur while executing the statement. Several SQL mode options are ...We must handle the case when you have inserted or updated a lot of rows in a nontransactional table for which changes cannot be rolled back when an error ...
https://dev.mysql.com/doc/refman/5.7/en/replication-threads.html
If the replica stops before the SQL thread has executed all the fetched statements, the I/O thread has at least fetched everything so that a safe copy of the transactions is stored locally in the replica's relay logs, ready for execution the next ...