So then it appears the predicate ("LETTER_BIN"."PRTY_ID"=102985) via LETTER_BIN_PRTY_ID_I is row source with the issue. In the first query it looks to be off by 2 orders of magnitude, 1692 vs 14, Thats usually not so good in an NL plan. Are the stats on the table and index both using 100% sample? Is there a histogram on LETTER_BIN. PRTY_ID? If you switch OFE to 9.2 just for the test query, do you get a different cardinality estimate, or is it that OFE=9.2 just yields an overall better plan for the full query? On Tue, Nov 24, 2009 at 11:19 AM, Neil Kodner <nkodner@xxxxxxxxx> wrote: > For what its worth, if I just explain plan on select * from letter_bin where > prty_id=12345, I get an incorrect cardinality estimate. For that reason, I > have not tried isolating other fields. -- Regards, Greg Rahn http://structureddata.org -- //www.freelists.org/webpage/oracle-l