Analysing Multi-dimensional Data Across Autonomous Data Warehouses

Business cooperations frequently require to analyse data across enterprises, where there is no central authority to combine and manage cross-enterprise data. Thus, rather than integrating independent data warehouses into a Distributed Data Warehouse (DDWH) for cross-enterprise analyses, this paper introduces a multi data warehouse OLAP language for integrating, combining, and analysing data from several, independent data warehouses (DWHs). The approach may be best compared to multi-database query languages for database integration. The key difference to these prior works is that they do not consider the multi-dimensional organisation of data warehouses.