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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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