The DBKEY SCOPE clause controls when the database key (dbkey) of
    an erased record may be reused by Oracle Rdb. When the DBKEY SCOPE
    is COMMIT, Oracle Rdb cannot reuse the dbkey of an erased record
    to store another record until the transaction that erased the
    original record completes (by entering COMMIT).

    The DBKEY SCOPE COMMIT clause specifies that the dbkey of each
    record used is guaranteed to remain consistent only during each
    transaction.