A Query Optimization Method Based on Virtual Data Warehouse
Wang Xin-gan · Information Technology and Informatization · 2009
For trans-regional enterprises,it is an important researchful problem to get information from data warehouses of different regions for decision-making.In this paper,the author proposes a query optimization algorithm based on virtual data warehouse.In addition,the author introduces the concept of metadata and quick query table.Through quick query table,you can get query scheme quickly.And then through mapping between quick query table and each metadata,you can form query scheme and finally get query results.Analysis data illustrate query efficiency can get improved by using this method.