Just_Corrupt

    This qualifier replaces the Just_Pages qualifier beginning in
    Oracle Rdb V7.0.

    Allows you to restore the corrupt pages and areas in the
    database as recorded in the corrupt page table (CPT). The CPT
    is maintained in the .rdb file. (Note that if the corrupt page
    table becomes full, the area with the highest number of corrupt
    pages is marked corrupt and the individual pages for that area
    are removed from the CPT.)

    Often, only one or a few pages in the database are corrupted
    due to hardware or software faults. The Just_Corrupt qualifier
    allows you to recover that database in minimal time with minimal
    interference; availability of the uncorrupted data is unaffected.
    It allows you to restrict the restoration to the pages (or areas)
    logged as corrupt in the corrupt page table.

    The Just_Corrupt qualifier is a positional qualifier. If you use
    it in the global position, RMU Restore restores all the corrupt
    pages and all the corrupt areas as logged in the corrupt page
    table. If you use it in the local position, RMU Restore restores
    only the corrupt pages (or the entire area) of the area name it
    modifies.

    It is possible to mix restoration of complete areas and just
    corrupt pages in the same command. The following example restores
    all of AREA_1 (regardless of whether or not it is corrupt), but
    just the corrupt pages (logged to the CPT) in AREA_2.

    $ RMU/RESTORE/AREA backup_file  AREA_1, AREA_2/JUST_CORRUPT

    Note that when the Just_Corrupt qualifier is used globally, all
    the corrupt pages logged to the CPT for the areas specified
    are restored. For example, the following command restores all
    the corrupt pages logged to the CPT for AREA_1 and AREA_2.
    (However, if one of the areas specified contains no corruptions,
    an informational message is displayed and that area is not
    restored.)

    $ RMU/RESTORE/JUST_CORRUPT backup_file /AREA AREA_1, AREA_2

    Restoration of corrupt pages and area can be performed on line.
    Online operations lock only the corrupt pages or areas for the
    duration of the restore operation. The remainder of the storage
    area can be read or updated by an application. When an entire
    area is restored on line, applications are locked out of the
    entire area for the duration of the restore operation.

    There are some restrictions on the use of the Just_Corrupt
    qualifier:

    o  The backup file must be a full backup file that contains the
       selected area.

    o  When space area management (SPAM) pages are restored, RMU
       Restore rebuilds the SPAM page using information from the
       range of data pages that the SPAM page manages.

    o  Area bit map (ABM) pages can be restored, but their content
       is not reconstructed. If ABM pages have been corrupted,
       regenerate them with the RMU Repair command.

    o  A by-page restore operation is like a by-area restore
       operation in that after-image journal (AIJ) recovery is
       required to make the restored data consistent with the rest
       of the database.

       Once the pages are restored, access to these restored pages is
       prohibited until they are made consistent. Inconsistent pages
       are stored in the corrupt page table (CPT) and have their
       timestamp field flagged by Oracle Rdb.

    o  You can also use the Just_Corrupt qualifier in a restore
       options file. However, you cannot use any of the following
       qualifiers with the Just_Corrupt qualifier (neither within an
       options file nor on the command line):

       -  Blocks_Per_Page

       -  Extension

       -  File

       -  Incremental

       -  Read_Only

       -  Read_Write

       -  Snapshot

       -  Spams

       -  Thresholds

       You can use the Just_Corrupt qualifier in conjunction with
       the Journal=file qualifier to greatly speed up processing of
       a large tape backup file. When you use the Journal qualifier,
       only those tapes containing corrupt pages, areas, or both, are
       mounted and processed.