# Berkeley DB Reference Guide: Release 4.7: upgrade requirements
Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

Release 4.7: upgrade requirements

The log file format changed in the Berkeley DB 4.7 release.

No database formats changed in the Berkeley DB 4.7 release.

The Berkeley DB 4.7 release does not support live replication upgrade from the 4.2 or 4.3 releases, only from the 4.4 and later releases.

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

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