public int lock_id() throws DbException;
The DbEnv.lock_id method returns a locker ID, which is guaranteed to be unique in the specified lock table.
The DbEnv.lock_id method throws an exception that encapsulates a non-zero error value on failure.
The DbEnv.lock_id method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv.lock_id method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.
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