Data Warehousing Data warehouse is the center of the architecture for information systems in the 1990s. Data warehouse supports informational processing by providing a solid platform of integrated, historical data from which to do analysis. Data warehouse provides the facility for integration in a world of unintegrated application systems. Data warehouse is achieved in an evolutionary, step-at-a-time fashion. Data warehouse organizes and stores the data needed for informational, analytical processing over a long historical time perspective. There is indeed a world of promise in building and maintaining a data warehouse. This pape