Re: excessive number of db writer

20 DB Writers is way too high.

what kind of an application is this? Even for a 'write-only-will-not-select-any-data' application, 20 is high questionable.

normally, you don't need to dab around with those parameters. why did they need to be changed?

sorry, but your Oracle consultant has got it wrong.

cheers
anand

On 06/09/06, K Gopalakrishnan <kaygopal_at_yahoo.com> wrote:
>
> Alex,
>
> Did you get an explanation for those suggestions? It would be difficult
> for us to comment on those changes without any additional details..
>
> However, However,However, 20 DBWriters are certainly high for your
> configuration ;)
>
> Have a nice day !!
> ------------------------------------------------------------
> Best Regards,
> K Gopalakrishnan,
> Co-Author: Oracle Wait Interface: Oracle Press 2004.
> http://www.amazon.com/gp/product/007222729X/
>
> Coming Soon: Oracle RAC Handbook, Oracle Press 2006
> http://www.amazon.com/gp/product/007146509X/
>
> ----- Original Message ----
> From: amonte <ax.mount_at_gmail.com>
> To: oracle-l_at_freelists.org
> Sent: Wednesday, September 6, 2006 1:39:51 AM
> Subject: excessive number of db writer
>
> Hi
>
> I have been suggested by some Oracle Consultant to set 20 Database Writer
> in a 12 CPU HP-UX Server.
>
> Does anyone know what are the side effects of having excessive DBWR? I
> detected a higher CPU usage (between, 1% to 2%) not sure if its due to the
> number of Database Writer. Because when I increased the number of DBWR at
> init.ora I also changed these parameters
>
> _row_cache_cursors = 60
> _kgl_latch_count = 59
> _kghdsidx_count = 4
> statistics_level = basic
>
> again suugested by this guy.
>
> TIA
>
> Alex
>
>
>

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