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Conventional query optimization usually minimizes the total time for complete evaluation of a query. We argue that this criterion may not be the only or even necessary requirement. In some interactive environments, a complete answer set may not be required and quick responses to queries can be very desirable. Minimizing the processing time for obtaining a single answer, a few answers, or most answers are identified as other potential optimization objectives. We attempt these optimizationdoi:10.1145/170088.170100 dblp:conf/cikm/Shum93 fatcat:hsvzt7pi5bhkha77ovbqxwq5cu