Ends a transaction by writing to the database any changes made
    during that transaction. COMMIT also releases all locks and
    closes open streams.

    The COMMIT statement affects all open databases, all changes
    to data made with Oracle Rdb data manipulation statements, and all
    changes to data definitions made with Oracle Rdb data definition
    statements.

    Example:

    RDO>   START_TRANSACTION READ_WRITE
    RDO>   FOR J IN JOBS WITH J.JOB_CODE = "PLMR"
    cont>    ERASE J
    cont>  END_FOR
    RDO>   COMMIT