Query-Optimization Based Virtual Data Warehouse Model
基于查询优化的虚拟数据仓库模型

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