Oracle-L: RE: Strange experience

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Mon, 26 Aug 2002 08:08:21 -0800
Message-ID: <F001.004BF9AE.20020826080821@fatcity.com>

Terry - My vote would be to try and track down which users are pounding your system at that time and ask what the heck they are doing. Once you have a handle on the "what" and "who", then the steps you need to take become clearer. I've had weird problems like this clear up by locating the user and telling them to "cut it out". Sometimes the answer is that they can't, but sometimes a small adjustment on their part can rectify issues.

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Monday, August 26, 2002 10:48 AM
To: Multiple recipients of list ORACLE-L

I finally got the SAs to turn on and check trace files. It is indicating that the file system that contains both the TEMP tablespace and the RBS tablespace is 99 - 100% busy during the 15 minutes prior to 15 minutes after the alert log warning.

I am looking at seperating the two tablespaces. But would it help to make the logs smaller? They are currently at 20M each.

Any other options I should look at?

TIA Terry Ball, DBA
Birch Telecom
Work: 816-300-1335
FAX: 816-300-1800 -----Original Message-----
Sent: Friday, August 23, 2002 3:27 PM
To: ORACLE-L_at_fatcity.com
Cc: TBall_at_birch.com

Sent on behalf of a colleague...

Are there any messages in /var/adm/messages (or wherever they have syslogd pointing to)?
What about the volume manager logs?

It may be related in some way to some other bugs:

Check problems: 4501030 and 4341008 in this patch

http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fpatches%2F108528&zone_32=Or acle%20aiowait

http://sunsolve.sun.com/pub-cgi/findPatch.pl?patchId=109688&rev=01

http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F23633&zone_32=asyn c%20I%2FO&wholewords=on

http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F28311&zone_32=Orac le%20aiowait

Other things that might be interesting to you/others: http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsrdb%2F45203&zone_32=async% 20I%2FO&wholewords=on
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsrdb%2F40043&zone_32=Oracle %20I%2FO
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsrdb%2F27049&zone_32=Oracle %20I%2FO
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsrdb%2F27574&zone_32=Oracle %20I%2FO

-----Original Message-----
Sent: Friday, August 23, 2002 2:49 PM
To: Multiple recipients of list ORACLE-L

Users hadn't even noticed it was happening. The only reason it was caught was because we have BMC's Patrol setup to monitor the DB and when this happens, Patrol alarms.

-----Original Message-----
Sent: Friday, August 23, 2002 1:37 PM
To: ORACLE-L_at_fatcity.com
Cc: TBall_at_birch.com

I've never encountered this particular problem, but I would be strongly inclined to turn off async IO and use multiple db writers.

Your statement that "the database isn't crashing" is highly subjective.

Ask your users if they agree.

Jraed

"Ball, Terry" <TBall_at_birch.com>
Sent by: root_at_fatcity.com
08/23/2002 09:48 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        Strange experience

Oracle 8.1.7.4 on Solaris 8.

We upgraded from 8.1.6.3 to 8.1.7.4 last month. Since the upgrade, we have
seen the occasional strange problem since. At approx. the same time (but not
daily), there will be an entry in the alert.log

                 WARNING: aiowait timed out 1 times

At the same time as the warning is entered into the alert log, all of the sql connections to the database are dropped. The background processes stay
active, but the any other processes die.

According to Metalink, this error should also be followed by a DB crash, which is _not_ what is happening. Metalink also says that Async IO should be turned off and multiple DBWRs should be started. SInce the database isn't crashing, there is some reluctance to turn off Async IO.

Has anyone else seen anything like this? And if so, how have you handled it?

TIA for any help that can be provided.

Terry Ball, DBA
Birch Telecom
Work: 816-300-1335
FAX: 816-300-1800
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Author: Ball, Terry
INET: TBall_at_birch.com

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Author: Ball, Terry
INET: TBall_at_birch.com

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