When downgrading to MySQL 5.1 from MySQL 5.4, you should keep in mind the following issues relating to features found in MySQL 5.4, but not in MySQL 5.1:
InnoDB.
MySQL 5.4 uses InnoDB Plugin
as the
built-in version of InnoDB
. MySQL 5.1
includes InnoDB Plugin
as of 5.1.38,
but as an option that must be enabled explicitly. See
Changes in MySQL 5.1.38. If you downgrade to MySQL
5.1 but do not use InnoDB Plugin
, some
configuration parameters differ, as described in
Section 1.5.5, “Configuration Differences in MySQL 5.4 from MySQL 5.1”.
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