Approximate query processing in decision support system environment

Abstract: - Both the approximate query process and decisional portals are emerging technologies in the decision support system environment. The former tool provides fast execution time for the analysis applications which require access to large amounts of data in the warehouse, by furnishing estimates of summary data with an approximation error acceptable for decision-maker users. The web-based second tool allows managers to monitor the enterprise activities on which decisions have to be taken by means of opportune statistical leds. From the technological viewpoint, such an environment is the result of the integration of data warehouse, query optimizers and Internet technologies