Oracle-L: Free Buffer Waits

From: Jack van Zanen <nlzanen1_at_EY.NL>
Date: Thu, 13 Jun 2002 01:03:32 -0800
Message-ID: <F001.0047CBE5.20020613010332@fatcity.com>

Hi All,

We have a production database that has a batch job running on it for months now. Last night one part of the batch job that normally takes between 20-30 minutes took well over 6 hours.
The only difference I can see between today & other days is that the Free Buffer Wait event was the top wait event, which it not normally is (not even top 10)

This database goes down every night for backup and this is the timings I got.

Total waits:22055
Total timeouts:22052
Time waited: 2225285 (is this ms or cs?) Avg.wait:100.8971

This whole thing puzzles me a bit since nothing changed to the database and nothing was in the Alert log. Also system was virtually idle during the 6 hours (no activity according to UNIX boys)

I was sound asleep when this happened so I don't have much more than this info.

Can anybody explain why this could have happened or point me to some documents that can. Standard answer you'll find that your DBWR can't keep up, but I have 4 of them and the sytem was idle.

THX

De informatie verzonden in dit e-mailbericht is vertrouwelijk en is uitsluitend bestemd voor de geadresseerde. Openbaarmaking, vermenigvuldiging, verspreiding en/of verstrekking van deze informatie aan derden is, behoudens voorafgaande schriftelijke toestemming van Ernst & Young, niet toegestaan. Ernst & Young staat niet in voor de juiste en volledige overbrenging van de inhoud van een verzonden e-mailbericht, noch voor tijdige ontvangst daarvan. Ernst & Young kan niet garanderen dat een verzonden e-mailbericht vrij is van virussen, noch dat e-mailberichten worden overgebracht zonder inbreuk of tussenkomst van onbevoegde derden.

Indien bovenstaand e-mailbericht niet aan u is gericht, verzoeken wij u vriendelijk doch dringend het e-mailbericht te retourneren aan de verzender en het origineel en eventuele kopieën te verwijderen en te vernietigen.

Ernst & Young hanteert bij de uitoefening van haar werkzaamheden algemene voorwaarden, waarin een beperking van aansprakelijkheid is opgenomen. De algemene voorwaarden worden u op verzoek kosteloos toegezonden.

The information contained in this communication is confidential and is intended solely for the use of the individual or entity to whom it is addressed. You should not copy, disclose or distribute this communication without the authority of Ernst & Young. Ernst & Young is neither liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt. Ernst & Young does not guarantee that the integrity of this communication has been maintained nor that the communication is free of viruses, interceptions or interference.

If you are not the intended recipient of this communication please return the communication to the sender and delete and destroy all copies.

In carrying out its engagements, Ernst & Young applies general terms and conditions, which contain a clause that limits its liability. A copy of these terms and conditions is available on request free of charge.

--

Please see the official ORACLE-L FAQ: http://www.orafaq.com
--

Author: Jack van Zanen
INET: nlzanen1_at_EY.NL

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: ListGuru_at_fatcity.com (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). Received on Thu Jun 13 2002 - 04:03:32 CDT