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Version 4.0 of the MySQL server includes many enhancements and new features:
InnoDB storage engine is now included in the standard binaries,
adding transactions, row-level locking, and foreign keys.
See section InnoDB.
MERGE tables, now supporting INSERT statements and
AUTO_INCREMENT.
See section MERGE.
UNION syntax in SELECT.
See section UNION.
DELETE statements.
See section DELETE.
libmysqld, the embedded server library.
See section libmysqld.
GRANT privilege options for even tighter control and
security.
See section GRANT.
GRANT system, particularly
useful for ISPs and other hosting providers.
See section 5.5.6 Limiting user resources.
SET OPTION.
For a full list of changes, please refer to the changelog sections for each individual 4.0.x release.
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