If nothing works and when u know the database has frozen u can run the
following command
to take dump of the database so that u can send it to oracle for analyzing
or u can analyze it too.
As jared says keep querying the session_Wait u will defnetly bound to catch
the guy who might be causing the database to kneel down.
Are u flushing shared pool quite frequently. check this out(this was one of
the cause which was bringing the database down and was fixed in 7.2 or 7.3 i
think.
Best bet is to keep querying the session_wait and catch the event which is
causing the probs.
IF YOU HAVE 9I OEM CLIENT INSTALLED USE THE RECORDING THRO PERFORMANCE
MANAGER WHICH WILL LET U KNOW LATER ON WHAT HAPPENED.
Please do check with the other DBA'S in this group before running of what i
say
Do systemstate dump 3 times in a row.
$ svrmgrl
connect internal
oradebug setmypid(process_id)
oradebug unlimit
oradebug dump systemstate 10 or
oradebug dump errorstack 3
-----Original Message-----
Sent: Tuesday, April 30, 2002 3:39 PM
To: Multiple recipients of list ORACLE-L
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" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
04/30/2002 12:21 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Tracy Rahmlow
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