Re: DBWR pegged out
- From: Kellyn Pedersen <kjped1313@xxxxxxxxx>
- To: dag@xxxxxxxxxxxxxxx, oracle-l@xxxxxxxxxxxxx
- Date: Tue, 8 Mar 2011 08:10:21 -0800 (PST)
Can you offer us a little more information?
Is this for one type of process? If it is from one type of process, have you
traced it to see what is it truly waiting on? Are the waits due to the dbwr or
is it simply i/o waits on your tempfiles?
I think we need more information on the actual waits to determine that you are
looking at dbwr, as I'm not seeing that here...
Kellyn Pedersen
Multi-Platform Database Administrator
www.pythian.com
http://www.linkedin.com/in/kellynpedersen
http://dbakevlar.com
________________________________
From: Doug Gernaat <dag@xxxxxxxxxxxxxxx>
To: oracle-l@xxxxxxxxxxxxx
Sent: Tue, March 8, 2011 8:55:04 AM
Subject: DBWR pegged out
after oracle suggested bumping up db_writer_processes from 2 to 4, at times it
is still getting pegged out. "write complete waits" will become a top time
event.
drilling down will show:
SID User Wait state/time Waiting Location
23 db_user In waiting (2ms) write complete waits, TEMP
datafile:604
30 db_user In waiting (88ms) write complete waits, TEMP
datafile:604
179 db_user In waiting (101ms) write complete waits, TEMP
datafile:604
189 db_user In waiting (0ms) write complete waits, TEMP
datafile:604
354 db_user In waiting (109ms) write complete waits, TEMP
datafile:604
1532 db_user In waiting (6ms) write complete waits, TEMP
datafile:604
and diff users will fall in out of these write complete waits. i always see
TEMP... not any other dfiles.
also during these times... ora_ckpt will start blocking other sessions. is this
I/O contention? any suggestions?
dbwr_io_slaves is set to 0.
this is 11.2.0.2 on solaris sparc 64.
thanks
-doug-
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