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The set of resolvents generated by a recursive intension in a lirst-order database is treated as a set of concurrent database queries. A strategy for egiciently ev,aluating these concurrent queries in a multi-processor environment is presented. The strategy combines three query processing techniques, namely, query decomposition, intermediate result sharing and data-flow and pipelined query execution to achieve a high degree of parallelism. An analytical study uses the response time for eachdblp:conf/vldb/RaschidS86 fatcat:ksvzd3ge2raz7ldzkbio3tdjnm