答复: excessive number of db writer

Maybe 2-statspack reports can help to measure if the change of DB-Writers has 
any effect on database performance.
1 before change, 1 after change
 
==============================
Regards.
Serol Luo
SMIC / BJ-IT / SDBS
(010-)6785-5000 Ext:21012
 
-----原始邮件-----
发件人: oracle-l-bounce@xxxxxxxxxxxxx 
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]代表; K Gopalakrishnan
发送时间: 2006年9月6日 17:05
收件人: ax.mount@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
主题: Re: excessive number of db writer
 
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@xxxxxxxxx>
To: oracle-l@xxxxxxxxxxxxx
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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