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: [EMAIL PROTECTED] cc: Tracy Rahmlow@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" <[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 INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Tracy Rahmlow INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). **************************************************************************** This electronic message contains information from CTIS, Inc., which may be company sensitive, proprietary, privileged or otherwise protected from disclosure. The information is intended to be used solely by the recipients named above. If you are not an intended recipient, be aware that any review, disclosure, copying, distribution or use of this transmission or its contents is prohibited. If you have received this transmission in error, please notify us immediately at [EMAIL PROTECTED] **************************************************************************** -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jay Mehta INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Wong, Bing INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).