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https://dev.mysql.com/doc/refman/5.7/en/partitioning-limitations-locking.html
For example, a SELECT from a partitioned MyISAM table locks only those partitions actually containing rows that satisfy the SELECT statement's WHERE condition are locked. For statements affecting partitioned tables using storage engines such as ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-stages-history-table.html
To set the number of rows per thread explicitly, set the performance_schema_events_stages_history_size system variable at server startup. When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when ... The events_stages_history table contains the N most recent stage events that have ended per ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-statements-history-table.html
To set the number of rows per thread explicitly, set the performance_schema_events_statements_history_size system variable at server startup. When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded ... The events_statements_history table contains the N most recent statement events that have ended per ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-transactions-history-table.html
To set the number of rows per thread explicitly, set the performance_schema_events_transactions_history_size system variable at server startup. When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded ... The events_transactions_history table contains the N most recent transaction events that have ended per ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-waits-history-table.html
To set the number of rows per thread explicitly, set the performance_schema_events_waits_history_size system variable at server startup. When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a ... The events_waits_history table contains the N most recent wait events that have ended per ...
https://dev.mysql.com/doc/refman/5.7/en/group-by-modifiers.html
Following each set of rows for a given year, an extra super-aggregate summary row appears showing the total for all countries and products. For any column in the result set with a name that matches any of those names, its value is set to NULL. For ... The GROUP BY clause permits a WITH ROLLUP modifier that causes summary output to include extra rows that represent higher-level (that is, super-aggregate) summary ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management-range-list.html
You can see that this is the case by re-running the previous SELECT query: mysql> SELECT * FROM tr WHERE purchased -> BETWEEN '1995-01-01' AND '1999-12-31'; Empty set (0.00 sec) Because of this, you must have the DROP privilege for a table before ...
https://dev.mysql.com/doc/refman/5.7/en/view-updatability.html
The flag is set to YES (true) if UPDATE and DELETE (and similar operations) are legal for the view. Derived tables can also be specified in multiple-table UPDATE and DELETE statements, but can only be used for reading data to specify rows to be ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-queries-myisam.html
An update of the following form is very fast: UPDATE tbl_name SET count_col=count_col+1 WHERE key_col=constant; This is very important when you use MySQL storage engines such as MyISAM that has only table-level locking (multiple readers with single ... Some general tips for speeding up queries on MyISAM tables: To help MySQL better optimize queries, use ANALYZE TABLE or run myisamchk --analyze on a table after it has been loaded with ...
https://dev.mysql.com/doc/refman/5.7/en/error-log.html
For information about selecting the error message character set and language, see Section 10.6, “Error Message Character Set”, and Section 10.12, “Setting the Error Message Language”. This section discusses how to configure the MySQL server ...The error log contains a record of mysqld startup and shutdown ...