Comments on: Killing an Oracle process from inside Oracle

By: Tanel Poder

Tanel Poder — Wed, 27 Jul 2011 19:22:30 +0000

@simone
PMON should detect such missing processes and eventually clean them up. But in practice I recall seeing such issue too… how many times did you wake up the PMON proc? Sometimes multiple wakeups are needed.

If multiple wakeups don’t help, it looks very much like some bug… perhaps with special types of sessions – like are these sessions of some background process or shared server sessions perhaps etc?

By: simone

simone — Tue, 26 Jul 2011 12:02:34 +0000

Hi there!
Great hands-on that you put together. However I think this is not covering my situation.
session status is KILLED but there is no OSpid process (Linux) – waking up POMON is not working and attaching to the process to issue an immediate crash wouldn’t work either because this is no process. No rollback is either affecting the sessions.
Those sessions they just don’t disappear.
Can you think of any possible path to follow?
Cheers
Simone

By: Niall Litchfield

Niall Litchfield — Fri, 17 Jun 2011 08:37:42 +0000

@Tanel Poder You can use process explorer to kill the offending thread on Windows without crashing oracle.exe. I can't guarantee that it will never crash the instance but I have relatively often used this technique (due to bad experiences with orakill).

By: KG

KG — Fri, 27 May 2011 12:59:47 +0000

@Tanel Poder Thanks tanel for Response .

By: Tanel Poder

Tanel Poder — Tue, 24 May 2011 18:54:58 +0000

@KG On windows you could also use the orakill command (if it works for you). Another way would be to use process explorer to end a single thread in a process, but I've never tested this on Oracle, so can't guarantee that it doesn't crash your whole oracle.exe process!

By: KG

KG — Tue, 24 May 2011 15:47:42 +0000

Tanel
we had a similar issue on windows 9i database .
we killed the session at oracle level with alter system kill session then session remained in killed status for hours.
Then i tried oradebug event immediate crash, but that seems to be stuck for hours
finally we had to bounce the database as locked object as key for application to work

By: Caesar

Caesar — Thu, 26 Aug 2010 22:33:34 +0000

Wow, it works perfectly, in my case the Orakill commando would not kill the process, it just hangs :P, this did the job, thanks a lot

By: Outsourcing Projects

Outsourcing Projects — Wed, 19 May 2010 11:30:56 +0000

Cheers! Of course use this only when you can’t use other more standard methods (like killing the process from OS level with kill (on Unix) or orakill (on Windows))
——————————–
sujatha

By: omair

omair — Sat, 23 Jan 2010 05:52:19 +0000

great stuff!! helped me much..

By: Haris

Haris — Thu, 20 Aug 2009 03:58:22 +0000

Hi Tanel

Very clear step by step explanations. Good Stuff!!!

However, I’d like to get your feedback on the same topic (correct me if i am wrong) which provided by Miladin Modrakovic, but he did the investigation on 11g. Here is the link for reference.
http://oraclue.com/2009/07/28/identifying-pidspid-for-killed-session-in-11g/

Cheers