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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