title: opt + + : an object-oriented implementation for extensible database query optimization david j. dewitt , navin kabra vldb j.. authors: nan. venue: nan. year: 1999.0
title: calibrating the query optimizer cost model of iro-db , an object-oriented federated database system georges gardarin , fei sha , zhao-hui tang very large data bases. authors: nan. venue: nan. year: 1996.0