Re: Datafile header surgery

I would go with rebuilding ...

Chances are high it's not only the file header that's corrupt - probably some zero'd out blocks here and there - who knows... And zero out means ... really really gone.

You might be able to extract some data out with a data unloader tho. (expect for the zero'd out blocks of course)

ps - i'm a KBC customer ;-)

>----- Oorspronkelijk bericht -----
>Van: Donahue, Adam [mailto:Adam.Donahue_at_kbcfp.com]
>Verzonden: woensdag, januari 10, 2007 07:07 PM
>Aan: oracle-l_at_freelists.org
>Onderwerp: Datafile header surgery
>
>Has Oracle (or anyone else) published the header format for database
>datafiles?
>
>I ask because one of our datafiles was corrupted due to an nStor outage
>yesterday, and thus is triggered an ORA-01251 when one attempts to
>recover it:
>
>01251, 00000, "Unknown File Header Version read for file number %s"
>// *Cause: Read of the file header returned a record but its version
>cannot
>// be identified. Either the header has been corrupted, or the
>file
>// is not a valid database file.
>// *Action: Have the operating system make the correct file available to
>// the database, or recover the file.
>
>The database is in development and therefore isn't backed up, but before
>rebuilding I thought it might be interesting to attempt a manual hack to
>the header to get the database to load so that data could be extracted.
>Any other potential workarounds here?
>
>Adam
>
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