Important note: If you
upgrade to MySQL 4.1.1 or higher, it is difficult to downgrade
back to 4.0 or 4.1.0! That is because, for earlier versions,
InnoDB is not aware of multiple
tablespaces.
InnoDB in 5.0.0 is essentially the same as
InnoDB-4.1.1 with the bugfixes of InnoDB-4.0.17 included.

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