I was reading that paper yesterday as well. We have a 120 Gig data
warehouse that uses partitions and a large fact table with many
smaller dimension tables ( a modified star schema design). This
database is currently on version 8.0.4 but will soon be 8.1.7 on Sun
Solaris 2.6.
Can anyone tell me if they have a similar design that has benefitted from
changing these two parameters?
Thanks in advance,
Cherie Machler
Oracle DBA
Gelco Information Network
John.Dailey@ing-
fsi-na.com To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: OPTIMIZER_INDEX_COST_ADJ &
OPTIMIZER_INDEX_CACHING
06/05/01 04:30
PM
Please respond
to ORACLE-L
Oracle 8.0.5.2.1 <-- yeah, I know I know... we are going to 8.1.7
eventually
AIX 4.3.3
Hey all.... Looking at our init parameters today after reading Tim
Gorman's White Paper "The Search for Intelligent Life in the Cost Based
Optimizer" and these 2 stood out like a sore thumb. Both are at the
default values:
OPTIMIZER_INDEX_COST_ADJ = 100
OPTIMIZER_INDEX_CACHING = 0
We have an OLTP and a DSS database and I am looking at changing the
OPTIMIZER_INDEX_CACHING = 90 for both and setting the
OPTIMIZER_INDEX_COST_ADJ to a reasonable value based on db sequential reads
vs. db scattered reads as a guideline.... any
suggestions/recommendations/words of warning/flogging? There is some
scattered info on this on Metalink but I'm looking for some real-world
improvements or headaches.
Thanks to all in advance and hopefully I won't have to type HELP so
someone can ask me if I'm an idiot....
:-)
John D.
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