The need for an integrated enterprise-wide set of management information pronounced Data Warehousing the ‘hot topic’ of the early-to-mid 1990’s, however, it became unfashionable through the mid-to-late 1990s, with the approach of Y2K and with it the widespread implementation of ERP systems. However, in recent times, the re-emergence of Data Warehousing, to address the limitations and unrealised...

Executive Summary Data warehouses are designed to aggregate data and allow decision makers to obtain accurate, complete and up to date information. A data warehouse stands or falls on the quality of the data it contains. Most existing warehouses contain a subset of the available data and allow a limited range of queries on that data, because it is impossible to justify the cost of development o...