Comments on: How to Recover Deleted Oracle Datafiles with No Downtime

By: Christo Kutrovsky

Christo Kutrovsky — Thu, 29 Dec 2011 00:54:16 +0000

Harish,

I think you missed the point. The point is that the file can be recovered without the presence of backups.

Your approach would only work if your database is in archivelog mode and all archived logs since the creation of the file in question are available.
This could potentially be years of archived logs.

By: Harish

Harish — Wed, 28 Dec 2011 19:29:50 +0000

In this manner u can recover ur dropped datafiles.This ll work for sure. All can try this.

Regards
Harish(poojari)
Kolar

By: Harish

Harish — Wed, 28 Dec 2011 19:25:34 +0000

Hi,
If datafile is dropped is os level and no backup is available means u can follow this steps.
1.make offline the dropped datafile.
2.ALTER DATABASE CREATE DATAFILE ‘/oradata/app/users.dbf’ path’ as ‘/oradata/app/datafiles/users.dbf’;
3.recover datafile ‘/new path’
4.make online the datafile.
Note: All archive logs should be there.

Regards Harish

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Data Recovery Advisor (DRA) and Health Monitor by example | IT World — Tue, 26 Jul 2011 08:08:10 +0000

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By: Rob

Rob — Tue, 13 Nov 2007 11:53:55 +0000

Nice trick. I wonder whether you saw an Oracle-l posting

http://www.freelists.org/archives/oracle-l/06-2007/msg00699.html

Unfortunately i do not have access to a linux server to try the method, but as the post suggest it could elminate the extra step of having to rman copy and then switch to the file

By: Mark Brinsmead

Mark Brinsmead — Sat, 10 Nov 2007 03:03:57 +0000

Slick trick! Others might have reported this before, but its the first time I’ve seen it.

It seems to be rather dependent on the implementation of /proc. I have seen lots of *nix variants with little or nothing implemented there, but this ought to work on a pretty wide variety of platforms. Not that I’m volunteering to try.

By: Christo Kutrovsky

Christo Kutrovsky — Thu, 08 Nov 2007 16:52:20 +0000

Frits,

Great article! I wish I had read it 4 months ago :)

The metalink note however I find disturbing. It think it will corrupt your database. I will check it out.

By: Frits Hoogland

Frits Hoogland — Thu, 08 Nov 2007 13:13:45 +0000

Mmh, I’ve covered this already: http://frits.homelinux.com/wordpress/?p=20

After that, oracle also made a metalink note about it (ML:444749.1). When asking them about a note with the same information as in my blogpost, they responded it came from an internal note which was around.

I’ve tested this with linux 32 & 64 bit and solaris.

By: Hazel

Hazel — Thu, 08 Nov 2007 12:10:39 +0000

VERY Clever ! Excellent solutuion.

By: Dan Norris

Dan Norris — Thu, 08 Nov 2007 04:26:41 +0000

Well done, Christo! I knew there was a way to do this, but haven’t tried to figure it out. Thanks for saving me a lot of work!