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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-transactions-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored transaction event, so there is no system variable for configuring the table size. Other tables that contain transaction event rows are logically ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-prepared-statements-instances-table.html
This is accessed through the MySQL C API and maps onto underlying server commands as shown in the following table. This is accessed using SQL statements and maps onto underlying server commands as shown in the following table. This table enables ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-wait-summary-tables.html
The Performance Schema maintains tables for collecting current and recent wait events, and aggregates that information in summary tables. Section 25.12.4, “Performance Schema Wait Event Tables” describes the events on which wait summaries are ...Example wait event summary information: mysql> SELECT * FROM performance_schema.events_waits_summary_global_by_event_name\G ...
https://dev.mysql.com/doc/refman/5.7/en/table-scan-avoidance.html
The output from EXPLAIN shows ALL in the type column when MySQL uses a full table scan to resolve a query. This usually happens under the following conditions: The table is so small that it is faster to perform a table scan than to bother with a ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-schema.html
Stage Event tables, which store event data for InnoDB ALTER TABLE and buffer pool load operations. For more information, see Section 14.17.1, “Monitoring ALTER TABLE Progress for InnoDB Tables Using Performance Schema”, and Monitoring Buffer ...
https://dev.mysql.com/doc/refman/5.7/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/5.7/en/backup-methods.html
Making a Hot Backup with MySQL Enterprise Backup Customers of MySQL Enterprise Edition can use the MySQL Enterprise Backup product to do physical backups of entire instances or selected databases, tables, or both. (Ideally, the InnoDB tables should ...Backing up the physical database files makes restore much faster than logical techniques such as the mysqldump ...
https://dev.mysql.com/doc/refman/5.7/en/rewriter-query-rewrite-plugin-usage.html
The plugin determines whether to rewrite statements based on its in-memory cache of rewriting rules, which are loaded from the rewrite_rules table in the query_rewrite database. The following example creates a simple rule to match statements that ...
https://dev.mysql.com/doc/refman/5.7/en/time-zone-support.html
This section describes the time zone settings maintained by MySQL, how to load the system tables required for named time support, how to stay current with time zone changes, and how to enable leap-second support. Time Zone Variables Populating the ...For information about time zone settings in replication setups, see Section 16.4.1.15, “Replication and System Functions” and Section 16.4.1.31, “Replication and Time ...
https://dev.mysql.com/doc/refman/5.7/en/extensions-to-ansi.html
(Nevertheless, it is preferable to use RENAME TABLE or ALTER TABLE ... Use of CHANGE col_name, DROP col_name, or DROP INDEX, IGNORE or RENAME in ALTER TABLE statements. Use of multiple ADD, ALTER, DROP, or CHANGE clauses in an ALTER TABLE statement.