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https://dev.mysql.com/doc/refman/5.7/en/sys-sys-get-config.html
Given a configuration option name, returns the option value from the sys_config table, or the provided default value (which may be NULL) if the option does not exist in the table. If sys_get_config() returns the default value and that value is ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-multiple-buffer-pools.html
To enable multiple buffer pool instances, set the innodb_buffer_pool_instances configuration option to a value greater than 1 (the default) up to 64 (the maximum). For systems with buffer pools in the multi-gigabyte range, dividing the buffer pool ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-instrumentation-checking.html
It is always possible to determine what instruments the Performance Schema includes by checking the setup_instruments table. Changes to this code occur often, which also affects the set of instruments. It is not practical to list all the ...
https://dev.mysql.com/doc/refman/5.7/en/recovery-from-backups.html
| mysql For more information about using mysqlbinlog to process binary log files, see Section 7.5, “Point-in-Time (Incremental) Recovery”. Now, suppose that we have a catastrophic unexpected exit on Wednesday at 8 a.m. To recover, first we ...
https://dev.mysql.com/doc/refman/5.7/en/show-create-event.html
SHOW CREATE EVENT event_name This statement displays the CREATE EVENT statement needed to re-create a given event. It requires the EVENT privilege for the database from which the event is to be shown. For example (using the same event e_daily ...
https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html
For escape character handling, a difference from the LIKE behavior is that the escape character for JSON_SEARCH() must evaluate to a constant at compile time, not just at execution time. For example, if JSON_SEARCH() is used in a prepared statement ...An error occurs if target or candidate is not a valid JSON document, or if the path argument is not a valid path expression or contains a * or ** ... The functions in this section perform ...
https://dev.mysql.com/doc/refman/5.7/en/query-log.html
The general query log can be very useful when you suspect an error in a client and want to know exactly what the client sent to mysqld. mysqld writes statements to the query log in the order that it receives them, which might differ from the order ... The general query log is a general record of what mysqld is ...
https://dev.mysql.com/doc/refman/5.7/en/drop-view.html
If any views named in the argument list do not exist, the statement returns an error indicating by name which nonexisting views it was unable to drop, but also drops all views in the list that do exist. To avoid this failure scenario, use IF EXISTS ...Note In MySQL 8.0, DROP VIEW fails if any views named in the argument list do not ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-index-types.html
How Secondary Indexes Relate to the Clustered Index Indexes other than the clustered index are known as secondary indexes. In InnoDB, each record in a secondary index contains the primary key columns for the row, as well as the columns specified for ... Each InnoDB table has a special index called the clustered index that stores row ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-atom-molecule-events.html
For example, a row fetch might result in rows like this: Row# EVENT_NAME TIMER_START TIMER_END ---- ---------- ----------- --------- 1 wait/io/file/myisam/dfile 10001 10002 2 wait/io/table/sql/handler 10000 NULL The row fetch causes a file read. In ... For a table I/O event, there are usually two rows in events_waits_current, not ...