I work in a dev shop - most of the sql is canned and pretty basic. We've
been running CBO in all of our dev environments, but we have a few long txns
that just take forever. At the request of some savvy developers, I turned
on RBO, and it brought down execution times dramatically.
I've been analyzing affected tables often (we do a lot of bulk load/unload
for testing), and have played with partitioning and clustering, particularly
on one table that's just a dog. CBO will always do a FTS where RBO uses the
PK to retrieve data.
Where to go next? I've been unable to alter the costs dramatically enough
to make any real difference in execution time.
thx
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Author: Magaliff, Bill
INET: Bill.Magaliff_at_lendware.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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