Re: Can I tryst in "physical ... direct" figures?
- From: J.Velikanovs@xxxxxxxx
- To: terrysutton@xxxxxxx
- Date: Fri, 24 Sep 2004 13:44:22 +0300
Terry,
thank you for interest on my post
The full PS report is available by using this URL:
ftp://ftp.alise.lv/pub/oracle/to_oral/perf_IKSP_20040923.txt
Regarding your assumption:
>> are you doing a lot of sorting?
Statistic Total per Second per
Trans
--------------------------------- ------------------ --------------
------------
sorts (disk) 286 0.0 0.0
sorts (memory) 7,945,774 176.6 84.6
sorts (rows) 594,066,774 13,201.2
6,326.1
Only 286 !? I don't think that 286 is a lot ;(
>> Does your Statspack report show a lot of direct path reads/writes?
Event Waits
---------------------------- ------------
direct path write 1,492,422 0 12 0
15.9
direct path read 1,111,255 0 6 0
11.8
Statistic Total per Second per
Trans
--------------------------------- ------------------ --------------
------------
physical writes 16,465,203 365.9 175.3
physical writes direct 16,343,723 363.2 174.0
Dose DBWR use direct path to write dirty blocks to disk? If not then for
DBWR work is just 121 480 writes from 16M.
This graph shows that is coleration between PW and PWD:
ftp://ftp.alise.lv/pub/oracle/to_oral/dwr.JPG
As you can see PWD distributed regulary during the day.
Jurijs
+371 9268222 (+2 GMT)
============================================
Thank you for teaching me.
http://otn.oracle.com/ocm/jvelikanovs.html
"Terry Sutton" <terrysutton@xxxxxxx>
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
24.09.2004 07:55
Please respond to terrysutton
To: <oracle-l@xxxxxxxxxxxxx>
cc:
Subject: Re: Can I tryst in "physical ... direct" figures?
It's not for me to tell you where you can tryst, or with whom.
But, getting back to direct read/writes... are you doing a lot of sorting?
Are you doing a lot of LOB access? Does your Statspack report show a lot
of
direct path reads/writes?
--Terry
----- Original Message -----
9.2.0.5 EE on Lintel RH AS 2.1
OLTP ~200 connections.
Today a have observed figures below in statspack report
Statistic Total per Second per
Trans
--------------------------------- ------------------ --------------
------------
physical reads 19,327,036 429.5 205.8
physical reads direct 10,482,393 232.9 111.6
physical writes 16,465,203 365.9 175.3
physical writes direct 16,343,723 363.2 174.0
It seams very strange to me that almost all writes and more then 1/2 of
reads is direct.
What do you think, can I trust on those figures? Can it be truth that all
writes are direct "bypassing the buffer cache, as written in Docs?
PS Report interval 750.02 (mins)
PS I know - SP aggregates live. Don't tell me do not look on it.
Jurijs
+371 9268222 (+2 GMT)
============================================
Thank you for teaching me.
http://otn.oracle.com/ocm/jvelikanovs.html
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