RE: optimizer_index_cost_adj and optimizer_index_caching

Yes, you gather a separate set of stats for each significantly distinct workload and swap them in for that workload. The key word is significantly. Don't try to micromanage statistics. You are dealing with statistics, don't try to interpret more accuracy into them as there is.

At 10:23 AM 3/5/2004, you wrote: 
So you define the timeframe for gathering the stats. And in a mixed case
workload, say OLTP during the day, big batch processing during the night, do
you gather two sets of stats with an appropriate timeframe, and swap them
out, just as described in chapter 3 of the 9i tuning guide? Do you find
yourself needing to manually tweak the system stats? And I've seen systems
where there is a predictable change in workload during the day, simply based
on how people do their work, so in a case like that, maybe even swap out
system stats during the day (assuming you have a good handle on how the
system is used)?

Regards,

Larry G. Elkins
elkinsl@xxxxxxxxx
214.954.1781

Wolfgang Breitling
Oracle7, 8, 8i, 9i OCP DBA
Centrex Consulting Corporation
http://www.centrexcc.com 


----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to:  oracle-l-request@xxxxxxxxxxxxx
put 'unsubscribe' in the subject line.
--
Archives are at http://www.freelists.org/archives/oracle-l/
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------

Other related posts: