The RdbALTER utility provides a low-level patch capability that
    allows you to repair corruption on Oracle Rdb database pages. In
    addition, it allows you to relocate database root, storage area,
    and snapshot files to other disks or directories.

                                   NOTE

       Oracle Rdb recommends that the RdbALTER utility be used only
       as a last resort to provide a temporary patch to a corrupt
       database.

       Use the RdbALTER utility only after you fully understand
       the internal data structure, know the information the
       database should contain, and know the full effects of the
       command. Because of the power of the RdbALTER utility and
       the cascading effects it can have, Oracle Rdb recommends
       that you experiment on a copy of the damaged database before
       applying the RdbALTER utility to a production database.

    The help provided with the RdbALTER utility provides complete
    information on using this utility.

    To invoke RdbALTER from the command level, enter the following
    command:

    $ RMU/ALTER

    From the RdbALTER> prompt, type HELP.