Oracle SQL Tuning Pocket Reference by Mark Gurry The following corrections were made to the 10/03 reprint: Here's a key to the markup: [page-number]: serious technical mistake {page-number}: minor technical mistake : important language/formatting problem (page-number): language change or minor formatting problem {40} 1st line; The parameter discussed is listed as OPTIMIZER_MODE_ENABLE. In version 8.1.7.2 of Oracle, there is no parameter name OPTIMIZER_MODE_ENABLE. Parameter listed NOW READS: OPTIMIZER_FEATURES_ENABLE