Re: ORA-27100: shared memory realm already exists - status

From: Anjo Kolk <anjo_at_oraperf.com>
Date: Wed, 19 Mar 2003 00:18:27 +0100
Message-Id: <24703.322264@fatcity.com>

I found the hash function, but that is only one bit. The next problem is to find the segments.
Come to Copenhagen in October and you will see ;-)

Anjo.

• Original Message ----- From: "Nelson, Allan" <anelson_at_midf.com> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, March 18, 2003 11:18 PM Subject: RE: ORA-27100: shared memory realm already exists - status

> Well Anjo, what sort of hash? I've been working to develop the stuff
> that Hailey talked about(direct SGA access) at Hotsos seminar but the
> best I've come up with so far has me sorting through all the shared
> memory segements seeing which one I can attach to. This is not good. I
> can get the id's through oradebug but I'm looking for a better way that
> is not indirectly dependant on connecting to the database.
>
> Allan
>
> -----Original Message-----
> Sent: Tuesday, March 18, 2003 12:49 PM
> To: Multiple recipients of list ORACLE-L
>
>
>
> >> How did Oracle know that the "shared memory realm already exists"?
>
> Oracle knows this because it attaches to a segment based on the hash
> value of $ORACLE_HOME and $ORACLE_SID. In that segment the $ORACLE_HOME
> and $ORACLE_SID are stored, so that oracle can see to which instance
> they belong.
>
> Anjo.
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Tuesday, March 18, 2003 4:14 PM
>
>
> > Thanks for all of the replies.
> >
> > I discovered that ipcs -mo will give me the number of
> > current processes connected to the memory segment. The "dead"
> > segments left by the instance which was giving me problems all had 0
> > in that column. The segment for the live instance had about 14
> > processes connected.
> >
> > I then used ipcrm -m <segment id> to delete the dead segments and
> > restarted the database.
> >
> > Now to figure out why the instance is failing to clean up these memory
>
> > segments.
> >
> > How did Oracle know that the "shared memory realm already exists"?
> >
> > Peter Schauss
> > Northrop Grumman Corporation
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: Schauss, Peter
> > INET: pschauss_at_northropgrumman.com
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Anjo Kolk
> INET: anjo_at_oraperf.com
>
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Nelson, Allan
> INET: anelson_at_midf.com
>
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Received on Tue Mar 18 2003 - 17:18:27 CST