Re: Exporting Directly to Tape

On Wed, 27 Dec 1995, Kilner, Carol wrote:

> Has any one had any experience doing an export directly to dat tape on an
> HP-UX version 10.
>
> I specify the tape drive as the export location i.e. /dev/rmt/0mbd and
> export a few tables. Everything seems to work okay.
> I then re-wind the tape and copy the backup onto disk and try to do an
> import.
>
> I use: dd if = /dev/rmt/0mb of=exported.data
> I then run imp and use this as the import file. I promptly get an error
> . importing CTSSYS's objects into CTSSYS
> IMP-00032: SQL statement exceeded buffer length
> IMP-00009: abnormal end of export file
> Import terminated successfully with warnings.
> $
> I tried increasing the size of the buffer but this didn't seem to work. The
> message also indicates it might be because the import file is corrupted.
>
>
> Can anyone shed some light onto this issue?
>

        I'm not on HP-UX 10 yet, but when I export to tape under
        HP-UX 9.0.4, I always import directly from tape.

        Are you sure dd can copy an export file properly from tape
        to disk ?  (I once had a problem where one version of frecover
        improperly handled copying an fbackup file written under another
        version ... copy seemed ok but Oracle couldn't read the database
        file ... so I wouldn't be sure that dd can copy a file that
        oracle wrote directly to tape).

        My gut feeling is that export/import directly to/from tape
        will be consistent, export/import to/from disk with a dd to
        tape as a backup will be consistent, but export to tape,
        dd to disk, import from disk may not be.

        helena

--

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