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https://dev.mysql.com/doc/refman/5.7/en/index-page-merge-threshold.html
The MERGE_THRESHOLD for index pages can be defined for a table or for individual indexes. A MERGE_THRESHOLD value defined for an individual index takes priority over a MERGE_THRESHOLD value defined for the table. Setting MERGE_THRESHOLD for a Table ...If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row is shortened by an UPDATE operation, InnoDB attempts to merge the index page with a neighboring index ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-events-table.html
The EVENTS table provides information about Event Manager events, which are discussed in Section 23.4, “Using the Event Scheduler”. The EVENTS table has these columns: EVENT_CATALOG The name of the catalog to which the event belongs. EXECUTE_AT ...EVENT_SCHEMA The name of the schema (database) to which the event ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-binary-log.html
For example, DDL statements such as CREATE TABLE and ALTER TABLE are always logged as statements, without regard to the logging format in effect, so the following statement-based rules for --binlog-do-db always apply in determining whether or not ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-buffer-page-table.html
The INNODB_BUFFER_PAGE table provides information about each page in the InnoDB buffer pool. For related usage information and examples, see Section 14.16.5, “InnoDB INFORMATION_SCHEMA Buffer Pool Tables”. Do not query this table on a ...To ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-ft-config-table.html
The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table ...The values for this column might change, depending on the needs for performance tuning and debugging for InnoDB full-text ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-statements-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored statement event, so there is no system variable for configuring the table size. Of the tables that contain statement event rows, ...The THREAD_ID ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-processlist-table.html
Note If the performance_schema_show_processlist system variable is enabled, the processlist table also serves as the basis for an alternative implementation underlying the SHOW PROCESSLIST statement. As mentioned previously, if the ... Note The ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-status-variable-tables.html
Note The value of the show_compatibility_56 system variable affects the information available from the tables described here. Status variable information is available in these Performance Schema tables: global_status: Global status variables. An ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-handling-nulls.html
DROP PARTITION, see Section 13.1.8, “ALTER TABLE Statement”.) NULL is also treated in this way for partitioning expressions that use SQL functions. If you insert a row into a table partitioned by RANGE such that the column value used to ...
https://dev.mysql.com/doc/refman/5.7/en/stored-program-restrictions.html
(Bug #16396) References to stored functions, loadable functions, and tables in the ON SCHEDULE clauses of CREATE EVENT and ALTER EVENT statements are not supported. Altering the system tables in the mysql database is not supported and is very likely ...The following statements are not permitted: The locking statements LOCK TABLES and UNLOCK ...Some of the restrictions ...