def restore(oid, serial, data, version, prev_txn, transaction):
    """Write data already committed in a separate database

        The restore method is used when copying data from one database
        to a replica of the database.  It differs from store in that
        the data have already been committed, so there is no check for
        conflicts and no new transaction is is used for the data.

        Arguments:

        oid
             The object id for the record

        serial
             The transaction identifier that originally committed this object.

        data
             The record data.  This will be None if the transaction
             undid the creation of the object.

        prev_txn
             The identifier of a previous transaction that held the
             object data.  The target storage can sometimes use this
             as a hint to save space.

        transaction
             The current transaction.

        Nothing is returned.
        """
