Rollback
    Norollback

    Returns a database that has been converted to an Oracle Rdb
    release 7.2 database (but not committed) to the previous version.
    You might decide to return to the previous version of the
    database for technical, performance, or business reasons.

    The Norollback qualifier prevents you from returning your
    converted database to the previous version. The default is the
    Norollback qualifier.

    If you specify both the Nocommit qualifier and the Rollback
    qualifier in the same RMU Convert command, your database is
    converted to Oracle Rdb release 7.2 and immediately rolled back
    to the previous version when the RMU Convert command is executed.

    This qualifier is valid only if you are converting from one of
    the following releases: 7.0 or 7.1.