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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Free Buffer Waits
Hi,
I came in early morning and saw the batch job had been taking forever. I immediately checked v$system_event (the job that took so long had just finished so session_wait was no longer option). Since we shutdown and backup our database every night the figure presented here was basically since the batch job started because that starts right after startup. So basically the system (with no other logins as per listener.ora file). had been waiting about 6-7 hours since startup on free buffer waits.
We did not introduce any other jobs to the batch and it has been running normally since that one time strange behaviour.
No logging of any hardware/software error was found on UNIX nor Symmetrix nor Oracle so we have given up for now.
Jack
"Johnson, Michael "
<Michael.Johnson_at_oln-a To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
fmc.af.mil> cc: (bcc: Jack van Zanen/nlzanen1/External/MEY/NL)
Sent by: Subject: RE: Free Buffer Waits
root_at_fatcity.com
17-06-2002 19:28
Please respond to
ORACLE-L
Just a couple questions .....
Did you introduce any new batch jobs into the system or any other interactive jobs that may have been running at the same time ?
How do you know that the Buffer Wait event was the top wait event and how did you see this ? eg. are you taking a time slice and loggin it at certain time into a 10046 trace ,etc.
Mike
-----Original Message-----
Sent: Thursday, June 13, 2002 2:04 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
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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.
--
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 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 Tue Jun 18 2002 - 02:43:22 CDT
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