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https://dev.mysql.com/doc/refman/5.7/en/nontransactional-tables.html
If you receive the following message when trying to perform a ROLLBACK, it means that one or more of the tables you used in the transaction do not support transactions: Warning: Some non-transactional changed tables couldn't be rolled back These ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-stages-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored stage event, so there is no system variable for configuring the table size. Of the tables that contain stage event rows, events_stages_current is ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-setup-actors-table.html
The setup_actors table contains information that determines whether to enable monitoring and historical event logging for new foreground server threads (threads associated with client connections). This table has a maximum size of 100 rows by ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-status-variable-summary-tables.html
Note The value of the show_compatibility_56 system variable affects the information available from the tables described here. The Performance Schema makes status variable information available in the tables described in Section 25.12.14, ...For ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-wait-tables.html
These tables store wait events: events_waits_current: The current wait event for each thread. There are also summary tables that aggregate information about wait events; see Section 25.12.15.1, “Wait Event Summary Tables”. For more information ... The Performance Schema instruments waits, which are events that take ...
https://dev.mysql.com/doc/refman/5.7/en/bnl-bka-optimization.html
In MySQL, a Batched Key Access (BKA) Join algorithm is available that uses both index access to the joined table and a join buffer. Benefits of BKA include improved join performance due to more efficient table scanning. Moreover, a join buffer can ...The BKA algorithm supports inner join, outer join, and semijoin operations, including nested outer ...
https://dev.mysql.com/doc/refman/5.7/en/nested-join-optimization.html
The syntax of table_factor is extended in comparison with the SQL Standard. The latter accepts only table_reference, not a list of them inside a pair of parentheses. This is a conservative extension if we consider each comma in a list of ...The ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-pruning.html
By doing so, it is possible to expend much less time and effort in finding matching rows than would be required to scan all partitions in the table. When the optimizer can make use of partition pruning in performing this query, execution of the ...
https://dev.mysql.com/doc/refman/5.7/en/where-optimization.html
COUNT(*) on a single table without a WHERE is retrieved directly from the table information for MyISAM and MEMORY tables. This is also done for any NOT NULL expression when used with only one table. For each table in a join, a simpler WHERE is ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management-hash-key.html
However, you can merge HASH or KEY partitions using the ALTER TABLE ... ADD PARTITION as shown here: ALTER TABLE clients ADD PARTITION PARTITIONS 6; . Tables which are partitioned by hash or by key are very similar to one another with regard to ...