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star transformation not used in production

edited Jan 28, 2009 11:55PM in Database Tuning (MOSC) 7 comments
 We have an issue where the same query runs well in UAT and uses star transformation.  However, in Prod the same query does not use star transformation rather performs a FTS on the fact table which never returns.  I have a workaround as:

alter session set optimizer_index_cost_adj =85; which causes the COB to use the proper index and utilize star transformation.

However, I need to know why the same query works in UAT but not in prod.

Additionally, we have imported the production table into UAT but the plan in UAT is still good. I've looked at the bitmap indexes between UAT and prod but don't see any major differences.

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