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 InnoDB. This statement works with MyISAM 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 13.6.15, “Limits on InnoDB Tables”.

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 is supported for partitioned tables, and you can use ALTER TABLE ... ANALYZE PARTITION to analyze one or more partitions; for more information, see Section 12.1.6, “ALTER TABLE Syntax”, and Section 18.3.3, “Maintenance of Partitions”.

ANALYZE TABLE returns a result set with the following columns.

TableThe table name
OpAlways analyze
Msg_typestatus, error, info, note, or warning
Msg_textAn informational message

You can check the stored key distribution with the SHOW INDEX statement. See Section, “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 they will be replicated to replication slaves. Logging can be suppressed with the optional NO_WRITE_TO_BINLOG keyword or its alias LOCAL.

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