Database_Verification
    Nodatabase_Verification

    The RMU /BACKUP command performs a limited database root
    file verification at the start of the backup operation. This
    verification is intended to help prevent backing up a database
    with various detectable corruptions or inconsistancies of the
    root file or associated database structures. However, in some
    limited cases, it can be desirable to avoid these checks.

    The qualifier /NODATABASE_VERIFICATION may be specified to avoid
    the database root file verification at the start of the backup.
    The default behavior is /DATABASE_VERIFICATION. Oracle strongly
    recommends accepting the default of /DATABASE_VERIFICATION.