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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Free Buffer Waits/CNTD......
Hi All,
As mysteriously as it took over 6 hours to run yesterday, it was back at 35 minutes today. Free buffer waits dropped out of the top 10 again as well.
My question now is:
If nothing changed to the database (we did not modify anything because we could not find the source of all evil) and there are no different processes running (it's the same batch job every day) and there are no users connected (listener.ora file), could it be that for some reason my DBWR processes weren't able to write to disk and Oracle did not report an error on it????
Jack
"Cary Millsap"
<cary.millsap_at_hot To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
sos.com> cc: (bcc: Jack van Zanen/nlzanen1/External/MEY/NL)
Sent by: Subject: RE: Free Buffer Waits
root_at_fatcity.com
13-06-2002 19:08
Please respond to
ORACLE-L
"free buffer waits" waits indicate that your DBWR can't keep up with its workload. Often caused by inefficient SQL competing with DBWR for an I/O device.
Cary Millsap
Hotsos Enterprises, Ltd.
cary.millsap_at_hotsos.com
http://www.hotsos.com
-----Original Message-----
Zanen
Sent: Thursday, June 13, 2002 4:04 AM
To: Multiple recipients of list ORACLE-L
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
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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 Liststo: 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).
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Author: Cary Millsap
INET: cary.millsap_at_hotsos.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Liststo: 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).
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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.
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.
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
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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 Liststo: 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 Fri Jun 14 2002 - 02:23:20 CDT
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