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Date: Wed, 26 Sep 2007 12:33:47 -0500 (CDT)
Subject: Re: A really strange one..
From: "Keith Moore" <kmoore@zephyrus.com>
To: andrew.kerber@gmail.com
Cc: "oracle-l" <oracle-l@freelists.org>
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Was it on AIX?

We have seen similar strange things there. I don't remember all the details,
but at one point there were no background processes, yet we could still logon
using sqlplus! Couldn't do anything, but it said we were connected.

When we tried to startup the database, it also told us that it was already
running.

Keith

> Ok, I just ran into a strange one this morning.  US central time that is.
>
> We are moving our clustered databases to new servers, and we put one
> database onto the new hardware for initial testing.  We restored from a
> backup, and got both instances running.  Today when I did a
>
> ps -ef | grep pmon
>
> I saw two pmon processes going for the single instance.  I have no idea what
> could have caused that.  So I set my oracle_sid, path, oracle_Home and
> shutdown the instance.  What do you know, there was still one pmon process
> running.  I did a kill -9 on that one.
>
> Then I go to start the instance again.  And I get this error:  ORA 01081
> "cannot start already-running ORACLE - shut it down first"
>
> I did a ps -ef | grep oracle, didnt get anything (except my user process of
> course).
>
> I finally googled and found one possibility, a locked shared memory segment.
>
> Sure enough
>
> ipcs -a | grep dba
>
> returned a large segment of memory that was still locked.  So I ran this
> (found on the same site) and released it:
>
> ipcs -a | grep dba | perl -ane 'system "ipcrm -$F[0] $F[1]"'
>
>
> My question is, has anyone seen this before, or know what causes it?
>
>
>
> --
> Andrew W. Kerber
>
> 'If at first you dont succeed, dont take up skydiving.'
>


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