Re: HIGH latch free Wait on moving from RBO to CBO?
- From: "shiva subramaniam" <shiva.subramaniam@xxxxxxxxx>
- To: VIVEK_SHARMA@xxxxxxxxxxx
- Date: Fri, 3 Mar 2006 11:00:37 +1100
I am wondering if you are using DISM (Dynamic Intimate shared memory). If
you are using DISM, please check if there is any swapping.
Regards
Shiva
On 3/3/06, VIVEK_SHARMA <VIVEK_SHARMA@xxxxxxxxxxx> wrote:
>
>
> ISSUE - Getting HIGH Latch Free Wait on the following Latches after moving
> from RBO to CBO. ( ALL Objects been analyzed at 100 %). CPU Usage on DB
> Server has gone up by about 30 %. NOTE - Application has also been migrated
> to a Higher release along with the CBO movement.
>
> Qs Any init.ora parameters to Tune ?
>
> Would increasing _shared_pool_reserved_min_alloc to 6140 from the Default
> of 4400 Help?
>
> Setting cursorsharing = FORCE/SIMILAR caused "%sys" component of CPU Usage
> to shoot to 99 % within minutes of Database startup. Seemed to be hitting
> some Bug in 9.2.0.5 (64 Bit) on Solaris 9. Has anybody experienced this &
> is it solved in a 9i Higher Patch ? Which Patch on 9i is advisable?
>
> Qs Will Tuning of individual SQLs reduce this wait ?
>
> Any Other Advice please?
>
> Top 5 Timed Events
> ~~~~~~~~~~~~~~~~~~ %
> Total
> Event Waits Time (s) Ela
> Time
> -------------------------------------------- ------------ -----------
> --------
> latch free 17,386,965 457,377
> 63.67
> CPU time 121,612
> 16.93
> db file sequential read 142,824,481 72,252
> 10.06
> log file sync 982,290 28,909
> 4.02
> db file scattered read 8,532,496 14,464
> 2.01
> -------------------------------------------------------------
> Wait Events for DB: UBIFIN Instance: UBIFIN Snaps: 1515 -1517
>
> Latch Activity for DB:
> Pct Avg
> Wait Pct
> Get Get Slps Time NoWait
> NoWait
> Latch Requests Miss /Miss (s)
> Requests Miss
> ------------------------ -------------- ------ ------ ------ ------------
> ------
> cache buffers chains 4,141,035,268 0.3 1.2 0 311,630,019
> 26.7
> cache buffers lru chain 3,785,689 6.1 0.2
> 2300 321,104,446 25.1
> library cache 86,823,459 1.3 0.5 31780
> 56,524 17.4
>
>
> Database Size 1 TB , Number of Concurrent Users = 5000 ,
>
> Application Hybrid Application - Banking Product , Oracle 9.2.0.5(64-Bit),
> Solaris 9, Number of CPUs on DB Server = 48
>
> Thanks Folks
>
> Vivek
>
> P.S. include my yahoo id (in CC) while replying please if possible
>
>
> **************** CAUTION - Disclaimer *****************
> This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended
> solely for the use of the addressee(s). If you are not the intended
> recipient, please notify the sender by e-mail and delete the original
> message. Further, you are not to copy, disclose, or distribute this e-mail
> or its contents to any other person and any such actions are unlawful. This
> e-mail may contain viruses. Infosys has taken every reasonable precaution to
> minimize this risk, but is not liable for any damage you may sustain as a
> result of any virus in this e-mail. You should carry out your own virus
> checks before opening the e-mail or attachment. Infosys reserves the right
> to monitor and review the content of all messages sent to or from this
> e-mail address. Messages sent to or from this e-mail address may be stored
> on the Infosys e-mail system.
> ***INFOSYS******** End of Disclaimer ********INFOSYS***
> --
> //www.freelists.org/webpage/oracle-l
>
>
>
Other related posts:
