The CHANGE DATABASE command modifies a physical RMS database
    element by performing a change in place. CDO changes the values
    you specify, and other values remain the same.

    If an RMS database element is controlled, CDO freezes previous
    versions and allows you to modify only the highest visible
    version. If an RMS database is uncontrolled, CDO modifies the
    highest version unless you specify another version number.

    If an RMS database element is controlled, you must reserve the
    database before you can issue the CHANGE DATABASE command. The
    SHOW DATABASE or SHOW RESERVATIONS command indicates whether this
    condition exists.

    The ON clause moves a physical RMS database to a new location on
    disk. When you specify the ON clause, CDO issues a notice asking
    you to confirm that you want to move the database. This notice
    cannot be suppressed.

    If the CHANGE DATABASE command succeeds, Oracle CDD/Repository
    moves the physical file on disk and updates the pointer to the
    physical file in the repository. If the CHANGE DATABASE command
    fails, Oracle CDD/Repository does not move the database.