RE: "cursor: pin S wait on X" during Benchmark Run .... SOLVED

Date: Wed, 2 Jan 2008 21:31:38 +0530
Message-ID: <>

Thanks Asif Ukja, folks for responding

shared_pool_size , session cached cursors was increased OPatch for Bug 5907779 was applied

Thereafter the resoective wait "cursor: pin S wait on X" disappeared from statcpack report.


From: Asif Momen [] Sent: Monday, December 31, 2007 2:43 AM
To: VIVEK_SHARMA;;;;;;;;;;;; Subject: Re: "cursor: pin S wait on X" during Benchmark Run

Hi Vivek,

I have encountered this wait event once on one of our development databases.

For details on this read:


Asif Momen

VIVEK_SHARMA <> wrote:


Oracle (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,


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


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

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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Received on Wed Jan 02 2008 - 10:01:38 CST

Original text of this message