Oracle-L: RE: Strange experience

From: Ball, Terry <TBall_at_birch.com>
Date: Fri, 23 Aug 2002 11:48:50 -0800
Message-ID: <F001.004BE9F6.20020823114850@fatcity.com>

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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