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https://dev.mysql.com/doc/refman/5.7/en/outer-join-optimization.html
MySQL implements an A LEFT JOIN B join_specification as follows: Table B is set to depend on table A and all tables on which A depends. Table A is set to depend on all tables (except B) that are used in the LEFT JOIN condition. (In other words, any ...The LEFT JOIN condition is used to decide how to retrieve rows from table ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-memory-model.html
Memory used depends on the load actually seen, not the load estimated or explicitly configured for. As the Performance Schema collects data, memory is allocated in the corresponding buffer. With the value set to 0: The corresponding internal buffer ...The buffer size is unbounded, and may grow with the ...
https://dev.mysql.com/doc/refman/5.7/en/do.html
In most respects, DO is shorthand for SELECT expr, ..., but has the advantage that it is slightly faster when you do not care about the result. For example, DO id FROM t1 is invalid because it references a table. DO is useful primarily with ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-doublewrite-buffer.html
Because the doublewrite buffer setting is global, doublewrite buffering is also disabled for data files residing on non-Fusion-io hardware. The doublewrite buffer is a storage area where InnoDB writes pages flushed from the buffer pool before ...If ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-filtering-names.html
To check which instrument or consumer names a pattern matches, perform a simple test: SELECT NAME FROM performance_schema.setup_instruments WHERE NAME LIKE 'pattern'; SELECT NAME FROM performance_schema.setup_consumers WHERE NAME LIKE 'pattern'; For ... Names given for filtering operations can be as specific or general as ...WHERE NAME LIKE 'wait/io/file/%'; The pattern '%/file/%' ...
https://dev.mysql.com/doc/refman/5.7/en/reset-master.html
For a server where binary logging is enabled (log_bin is ON), RESET MASTER deletes all existing binary log files and resets the binary log index file, resetting the server to its state before binary logging was started. For a server where GTIDs are ... RESET MASTER Warning Use this statement with caution to ensure you do not lose any wanted binary log file data and GTID execution ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-tablespaces-table.html
The INNODB_SYS_TABLESPACES table provides metadata about InnoDB file-per-table and general tablespaces, equivalent to the information in the SYS_TABLESPACES table in the InnoDB data dictionary. For related usage information and examples, see ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-create-table-external.html
There are different reasons for creating InnoDB tables externally; that is, creating tables outside of the data directory. Those reasons might include space management, I/O optimization, or placing tables on a storage device with particular ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-server-side-help.html
The proper operation of this command requires that the help tables in the mysql database be initialized with help topic information (see Section 5.1.14, “Server-Side Help Support”). These have the same meaning as for pattern-matching operations ... mysql> help search_string If you provide an argument to the help command, mysql uses it as a search string to access server-side help from the contents of the MySQL Reference ...
https://dev.mysql.com/doc/refman/5.7/en/drop-table.html
Be careful with this statement! For each table, it removes the table definition and all table data. Important When a table is dropped, privileges granted specifically for the table are not automatically dropped. The statement drops all named tables ...If the table is partitioned, the statement removes the table definition, all its partitions, all data stored in those partitions, and all partition definitions associated with the dropped ...