ANALYZE [LOCAL | NO_WRITE_TO_BINLOG] TABLE tbl_name [, tbl_name] ...

ANALYZE TABLE analyzes and stores the key distribution for a table. During the analysis, the table is locked with a read lock for MyISAM and BDB. For InnoDB the table is locked with a write lock. This statement works with MyISAM, BDB, and InnoDB tables. For MyISAM tables, this statement is equivalent to using myisamchk --analyze.

For more information on how the analysis works within InnoDB, see Section 13.2.16, “Restrictions on InnoDB Tables”.

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MySQL uses the stored key distribution to decide the order in which tables should be joined when you perform a join on something other than a constant. In addition, key distributions can be used when deciding which indexes to use for a specific table within a query.

This statement requires SELECT and INSERT privileges for the table.

ANALYZE TABLE returns a result set with the following columns:

You can check the stored key distribution with the SHOW INDEX statement. See Section 12.5.5.15, “SHOW INDEX Syntax”.

If the table has not changed since the last ANALYZE TABLE statement, the table is not analyzed again.

By default, ANALYZE TABLE statements are written to the binary log so that such statements used on a MySQL server acting as a replication master will be replicated to replication slaves. Logging can be suppressed with the optional NO_WRITE_TO_BINLOG keyword or its alias LOCAL.