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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

### Release 4.0: DB_ENV->lock_id_free

A new locker ID related API, the DB_ENV->lock_id_free method, was added to Berkeley DB 4.0 release. Applications using the DB_ENV->lock_id method to allocate locker IDs may want to update their applications to free the locker ID when it is no longer needed.

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