21. The article of manufacture of claim 17, further comprising the step of accessing each index with a multiple index technique.
17. An article of manufacture comprising a program storage medium readable by a computer and embodying one or more instructions executable by the computer to perform method steps for executing a query to retrieve data stored on a data storage device, the method comprising the step of: while accessing one or more indexes to retrieve row identifiers, applying index matching predicates in the query to select row identifiers; and applying index screening predicates to eliminate one or more selected row identifiers.