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ANALYZE TABLE tbl_name[,tbl_name...]

Analyse and store the key distribution for the table. During the analysis, the table is locked with a read lock. This works on MyISAM and BDB tables.

This is equivalent to running myisamchk -a on the table.

MySQL uses the stored key distribution to decide in which order tables should be joined when one does a join on something else than a constant.

The command returns a table with the following columns:

Column	Value
Table	Table name
Op	Always "analyze"
Msg_type	One of status, error, info or warning.
Msg_text	The message.

You can check the stored key distribution with the SHOW INDEX command. See SHOW DATABASE INFO.

If the table hasn't changed since the last ANALYZE TABLE command, the table will not be analysed again.