Chuck Whealton wrote:
> TG wrote:
>
>>9.2.0.6 on Windows server
>>
>>Here is the situation:
>>
>>Junior dba wanted to free up some space on a server, so he deleted
>>datafiles from a shut down database that he *thought* was his test, not
>>his active development database, of course it turns out he deleted the
>>wrong set of files and this database was (inexplicably) not backed up.
>>
>>I go in with a file recovery tool, recover most of the datafiles, and
>>more importantly, recover the ones that have the critical info that can
>>save a long & costly rebuild of the dev db.
>>
>>I create a new blank database on another machine, then I thought I could
>>rebuild the controlfile with the recovered datafiles from the deleted
>>database added. When I created the new database I created it with a
>>slightly different name, no problem I think, thinking I could use "set
>>database" and alter the init.ora and call it the same as the deleted
>>database, so I do the following:
>>
>>backup control file to trace in new database, shut it down, edit the
>>init.ora with new (old) name, startup nomount and try to recreate the
>>control file with "set database "newname" resetlogs" and the datafiles
>>from the deleted database added at the end of the create controlfile
>>script. The new database is being set to the same name as the deleted
>>one, but I am getting "ORA-01159: file is not from same database as
>>previous files - wrong database id" errors from the added file(s)
>>
>>I missed something here, do I need to recreate the new database from
>>scratch with the same name as the deleted one? Is it possible to do what
>>I am attempting? I thought it should be, and this is the only option I
>>have in any case.
>
>
> TG:
>
> I believe the DBID is written everywhere - controlfiles, datafiles,
> possibly redos, etc. There's an NID (new ID) utility in 9i that you
> can use to change the DBID. It also works with 8i. I don't
> know/remember what, if any, additional functionalitty it might have
> that could help you either set a specific DBID, or somehow change them
> all to be identical.
>
> I have to say, I'd be leary of doing what you're trying to do - though
> I certainly understand why!
>
> It sounds like you had something backed up. You were able to recover
> most, though not all of the datafiles?
>
> Although it is considered a "not to be done" thing, I have seen a
> database backed up live via Legato NetWorker withOUT the Oracle
> BusinessSuite Module restored, opened and recovered and it worked. I
> was shocked. That was a couple years back.
>
> Charles R. Whealton
> Charles Whealton @ pleasedontspam.com
>
thanks
The dbid change *might* work, but I have to find out what the dbid of
the old datafiles is. Anyway,its worth a try.
Received on Wed Jul 19 2006 - 15:04:12 CDT
