This library module is an interface to the Berkeley DB toolset to support persistent storage of Prolog terms. Some of the notions of Berkeley DB are directly inherited, e.g. the environment.
The interface uses the Concurrent Access Methods product of Berkeley DB. This means that multiple processes can open the same databas, but transactions and disaster recovery are not supported.
The environment and the database files are ordinary Berkeley DB entities but uses a custom hash function which means that most, but not all, of the standard support utilities will work.