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

From: Wong, Bing <bing.wong_at_IngramMicro.com>
Date: Tue, 30 Apr 2002 13:35:05 -0800
Message-ID: <F001.00454369.20020430133505@fatcity.com>

Check to see if old dedicated processes are still hanging at the unix level. I had those happened to me and we had to kill them manually. I mean old is one day or few hours old.

What's the size of the memory? What's the size of SGA?

-----Original Message-----

Sent: Tuesday, April 30, 2002 2:04 PM
To: Multiple recipients of list ORACLE-L

Tracy,

How is the CPU and memory usage on the server when the database hangs? It's likely that database might be experiencing severe latch contention, preventing you from running any queries. To diagnose the problem, you should look at the Oracle Wait events statistics periodically before database hangs. You should install statspack, or if that's not done, run utlbstat/utlestat every hour or so and analyze the statistics. I think that database must be waiting on resources before it completely hangs. Look for wait events, system statistics and latch statistics.

Jay

-----Original Message-----

Sent: Tuesday, April 30, 2002 4:09 PM
To: Multiple recipients of list ORACLE-L

Hi,
I am unable to query from the database when it hangs up. I am only able to execute the shutdown abort command.

To: ORACLE-L_at_fatcity.com
cc: Tracy Rahmlow_at_AMEX

Tracy,

You can start by using the query below to determine what the sessions are actually waiting on:

select

   s.username username,
   e.event event,
   s.sid,
   e.p1text,
   e.p1,
   e.p2text,
   e.p2,
   e.wait_time,
   e.seconds_in_wait,
   e.state

from v$session s, v$session_wait e
where s.username is not null

and s.sid = e.sid

skip sqlnet idle session messages and e.event not like '%message%client' order by s.username, upper(e.event);

Jared

"Tracy Rahmlow" <tracy.rahmlow_at_aexp.com> Sent by: root_at_fatcity.com
04/30/2002 12:21 PM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc:
        Subject:        Prod problem, please help!!!

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: Tracy Rahmlow
INET: tracy.rahmlow_at_aexp.com

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Author: Wong, Bing
INET: bing.wong_at_IngramMicro.com

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