Oracle-L: RE: Prod problem, please help!!!

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Tue, 30 Apr 2002 11:53:47 -0800
Message-ID: <F001.00453FC2.20020430115347@fatcity.com>

Tracy - Two ideas:

	On Metalink, get note 61552.1 Diagnosing Database Hanging Issues
	I would try to run STATSPACK (or utlbstat/utlestat) while the

database is hanging. You can also run STATSPACK on a schedule. Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Tuesday, April 30, 2002 2:22 PM
To: Multiple recipients of list ORACLE-L

I have opened a TAR with Oracle and am waiting a resolution. In the meantime,
I am wondering if anybody else has any ideas while I wait.

Specifics:

   IBM AIX 4.3
   Rdms 8.1.7.3
   Database ~75g
   OLTP database with approximately 500 dedicated connections and 500 shared connections with Oracle's MTS.

Problem:
The database hangs, and no user is able to connect to the instance, except locally through srvmgrl. Even within svrmgrl, we are unable to select anything from
the
database without the query hanging. However, we can abort the instance (shutdown abort) and start it up again just fine. This has happened on 4-22, 4-29 &
4-30 in the
early afternoon. Usually, this is also our peak busy rate for the week. We are executing MTS for 4 applications, all other applications connect through dedicated server.
The alert log contains a message unable to start a shared server process. This week it was #41 and last week it was #25. Normally, we do not exceed 5 shared
servers. Another thing I noticed is that there is no time allocated to any of the newly created shared servers. It is as if, it can not process any work
through existing shared
servers and decides to allocate another one, until finally it freezes. I am not sure if this is a MTS problem because I would suspect that I should be able
to establish
a dedicated server connection. And I can not. I think that this is just a symptom of the underlying problem. It would appear to me that we are running out
of a resource,
however our sysadms do not see any resource problems. Does anybody have any ideas how to debug this? Thanks

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Author: Tracy Rahmlow
INET: tracy.rahmlow_at_aexp.com

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Author: DENNIS WILLIAMS
INET: DWILLIAMS_at_LIFETOUCH.COM

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