Re: excessive number of db writer

  • From: K Gopalakrishnan <kaygopal@xxxxxxxxx>
  • To: ax.mount@xxxxxxxxx, oracle-l@xxxxxxxxxxxxx
  • Date: Wed, 6 Sep 2006 02:05:02 -0700 (PDT)


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.

Coming Soon: Oracle RAC Handbook, Oracle Press 2006

----- 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


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.



Other related posts: