Re: "cursor: pin S wait on X" during Benchmark Run
Date: Sun, 30 Dec 2007 13:13:03 -0800 (PST)
Message-ID: <518747.89593.qm@web56601.mail.re3.yahoo.com>
Hi Vivek,
I have encountered this wait event once on one of our development databases.
For details on this read:
http://momendba.blogspot.com/2007/06/cursor-pin-s-wait-on-x-wait-event-in.html
Regards
Asif Momen
http://momendba.blogspot.com/
VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com> wrote: Folks
Oracle 10.2.0.3 (NON-RAC), Solaris 10
In a Benchmark Run, on Firing 2000 Application processes connecting VIA 24 dispatchers & 100 Shared Servers, getting the following WAITs
NOTE - This wait is NOT occuring when firing 700 (Lesser Number of) Application processes connecting to the Database via the same MTS Setup.
NOTE - This wait is also NOT occuring in production where 20,000 Application processes connect via a similar MTS Setup.
DB CPU Usage is 25 % , APP CPU usage is 8 %
Is this a BUG? How is this to be approached?
Should the BLOCKING & Waiting SQLs/sessions be identified? Will the following SQL Script work:- SELECT s.sid, s.username,
e.wait_time, b.sql_text, m.p1,m.p2,m.p3
from v$session s, v$session_wait e, v$sqlarea b, v$MUTEX_SLEEP_HISTORY m where m.p1= e.p1
and s.username is not null and s.sid = e.sid and s.sql_address=b.address
order by e.wait_time;
Cheers & Thanks
Vivek
P.S.
Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ ------ CPU time 7,561 52.1 cursor: pin S wait on X 272,212 4,345 16 29.9^LMutex Sleep DB/Inst: PNB70MB/PNB70MB Snaps: 397-407
-> ordered by Wait Time desc
Wait Mutex Type Location Sleeps Time (s) ------------------ -------------------------------- -------------- ------------ Cursor Pin kkslce [KKSCHLPIN2] 178,039 2,583.1 Cursor Pin kksfbc [KKSCHLFSP2] 148,073 1,675.8 Cursor Pin kksfbc [KKSCHLPIN1] 284 3.2 Cursor Pin kksLockDelete [KKSCHLPIN6] 13,883 2.6 Cursor Parent kksfbc [KKSPRTLOC1] 245,448 1.2...
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