MySQL Manual | D.4.42 Changes in release 3.23.18

Fixed a problem from 3.23.17 when choosing character set on the client side.
Added FLUSH TABLES WITH READ LOCK to make a global lock suitable for making a copy of MySQL datafiles.
CREATE TABLE ... SELECT ... PROCEDURE now works.
Internal temporary tables will now use compressed index when using GROUP BY on VARCHAR/CHAR columns.
Fixed a problem when locking the same table with both a READ and a WRITE lock.
Fixed problem with myisamchk and RAID tables.

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