Re: Tuning Question and Advice needed ..

Thank you Sergey ..

Bunyamin K. Karadeniz
Oracle DBA / Developer
Civilian IT Department
Havelsan A.S. Eskisehir yolu
7.km Ankara Turkey
Phone: +90 312 2873565 / 1217
Mobile : +90 535 3357729

• Original Message ----- To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Saturday, April 27, 2002 6:28 AM

> Hello Bunyamin,
>
> 1) These values are values between starting utlbstat and utlestat (not
> from database startup).
>
> 2) It's impossible to make all wait events=0. Importance of different
> events depends on what database you have (OLTP, DSS, mixed).
> Optimims for wait events are zero wait time :-)
> You should query another views for identifying are these values
> optimal. For example for Latch Free event you should do the following
> query:
>
> select name, sleeps/gets
> from v$latch
> where name='cache buffers lru chain';
>
> sleeps/gets should be > 99% or you have to increase
> DB_BLOCK_LRU_LATCHES (default value for this parameter should be
> num_cpu*1.5 maximum value not greater then num_cpu*6)
>
> So for another events.
>
> Your values are normal for approx 10 Gb database with hundred or more
> concurrent sessions (working hard).
>
>
>
> Saturday, April 27, 2002, 2:18:32 AM, you wrote:
>
> BKK> Dear Gurus , I need your help ..
>
> BKK> I run UTLBSTAT and then after 2 hour run the UTLESTAT.sql scripts as
internal and look at the report.txt generated ...
>
> BKK> On report.txt , I see that
>
> BKK> System wide wait events for background processes:
> BKK> System wide wait events for non-background processes :
> BKK> Latch statistics
> BKK> Statistics on no_wait gets of latches
> BKK> Sum IO operations over tablespaces
>
> BKK> and other things also is in the report.
>
> BKK> Question 1)
> BKK> What I wonder is
> BKK> Are these values between the start and end times of scripts.
> BKK> What I mean is , for example Is the wait events for non-background
processes list in report are the wait events occured between UTLBSTAT script run time T1 and UTLESTAT script run time T2 ?
> BKK> or are they total wait events from the startup of database ?
>
> BKK> Question 2)
> BKK> I see lots of wait events occur ..
> BKK> What will I give importance to ?
> BKK> will I try to make 0 wait event in report. What are the optimums of
wait events. ?
> BKK> For example I see
>
> BKK> "Latch free event" occured for 3015 times ,
> BKK> "control file sequential read" occured for 182 times ,
> BKK> "log file sync" occured for 1756 times
> BKK> "direct path read" occured for 11000 times
> BKK> "direct path write" occured for 6000 times
>
> BKK> Are these values normal ? Will I try to make them 0 in the tomarrows
report ?
>
> BKK> How can I comment on the report ? Is there a link you can tell me to
understand the problems and will help me to read and action about the problems ?
>
> BKK> Thank you...
>
>
>
>
> BKK> Bunyamin K. Karadeniz
> BKK> Oracle DBA / Developer
> BKK> Civilian IT Department
> BKK> Havelsan A.S. Eskisehir yolu
> BKK> 7.km Ankara Turkey
> BKK> Phone: +90 312 2873565 / 1217
> BKK> Mobile : +90 535 3357729
>
>
> --
> Best regards,
> Sergey mailto:dsv_at_pptus.oilnet.ru
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Sergey V Dolgov
> INET: dsv_at_pptus.oilnet.ru
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Bunyamin K. Karadeniz
  INET: bunyamink_at_havelsan.com.tr

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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