Given that OPTIMIZER_INDEX_CACHING is presumably meant
to the indicative of how much of an index is cached,
then setting it to your buffer hit ratio would seem
like a reasonable starting point.
Cheers
Connor
--- [EMAIL PROTECTED] wrote: > 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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=====
Connor McDonald
http://www.oracledba.co.uk (mirrored at
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"Some days you're the pigeon, some days you're the statue"
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