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https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
All subquery forms and operations that the SQL standard requires are supported, as well as a few features that are MySQL-specific. They provide alternative ways to perform operations that would otherwise require complex joins and unions. A ...Here ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking-transaction-model.html
To implement a large-scale, busy, or highly reliable database application, to port substantial code from a different database system, or to tune MySQL performance, it is important to understand InnoDB locking and the InnoDB transaction model. This ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmp-table.html
The INNODB_CMP and INNODB_CMP_RESET tables provide status information on operations related to compressed InnoDB tables. The INNODB_CMP and INNODB_CMP_RESET tables have these columns: PAGE_SIZE The compressed page size in bytes. Pages are ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmpmem-table.html
The INNODB_CMPMEM and INNODB_CMPMEM_RESET tables provide status information on compressed pages within the InnoDB buffer pool. The INNODB_CMPMEM and INNODB_CMPMEM_RESET tables have these columns: PAGE_SIZE The block size in bytes. PAGES_FREE The ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-and-plugins.html
The associated event information, including aggregate information, remains readable in performance_schema database tables. Removing a plugin with UNINSTALL PLUGIN does not affect information already collected for code in that plugin. For additional ...Time spent executing the code while the plugin was loaded was still spent even if the plugin is unloaded ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-sql-statements.html
SELECT * FROM INFORMATION_SCHEMA.ENGINES [WHERE ENGINE LIKE 'NDB%'] This is the equivalent of SHOW ENGINES, but uses the ENGINES table of the INFORMATION_SCHEMA database. You can also query the tables in the ndbinfo information database for ... This ...SHOW ENGINES This statement can be used to determine whether or not clustering support is enabled in the MySQL server, and if so, whether it is ...
https://dev.mysql.com/doc/refman/5.7/en/channels-naming-conventions.html
Because channel names are used in replication metadata repositories, the character set used for these is always UTF-8. Although you are generally free to use any name for channels, the following names are reserved: group_replication_applier ... This ...
https://dev.mysql.com/doc/refman/5.7/en/event-scheduler-thread-states.html
Waiting for scheduler to stop The thread issued SET GLOBAL event_scheduler=OFF and is waiting for the scheduler to stop. These states occur for the Event Scheduler thread, threads that are created to execute scheduled events, or threads that ...
https://dev.mysql.com/doc/refman/5.7/en/fetch.html
To detect this condition, you can set up a handler for it (or for a NOT FOUND condition). This statement fetches the next row for the SELECT statement associated with the specified cursor (which must be open), and advances the cursor pointer. If a ...
https://dev.mysql.com/doc/refman/5.7/en/mysqlbinlog-server-id.html
You can use mysqlbinlog to request log files from a server in several ways: Specify an explicitly named set of files: For each file, mysqlbinlog connects and issues a Binlog dump command. Specify the beginning file and --to-last-log: mysqlbinlog ...