### Berkeley DB Reference Guide: Upgrading Berkeley DB Applications |

### Release 3.0: upgrade requirements

Log file formats and the Btree, Recno and Hash Access Method database formats changed in the Berkeley DB 3.0 release. (The on-disk Btree/Recno format changed from version 6 to version 7. The on-disk Hash format changed from version 5 to version 6.) 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.

Copyright (c) 1996-2005 Sleepycat Software, Inc. - All rights reserved.