The technology of virtual data warehouses catches more and more interests of people. In this paper,aQuery-Optimization Based Virtual Data Warehouse (QVDW)model is presented,which not only has all the advantagesthat a virtual data warehouse has,but also can change bottom layer data structures and the model itself according tousers' various query requests. The aim is to offer customized service to OLAP (on-line analysis processing)users.
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