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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

### Release 3.2: upgrade requirements

Log file formats and the Queue Access Method database formats changed in the Berkeley DB 3.2 release. (The on-disk Queue format changed from version 2 to version 3.) Until the underlying databases are upgraded, the DB->open method will return a DB_OLD_VERSION error.

For further information on upgrading Berkeley DB installations, see Upgrading Berkeley DB installations.

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