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Multidimensional databases support efficiently on-line analytical processing(OLAP). In this paper, we depict a model dedicated to multidimensionaldatabases. The approach we present designs decisional information through aconstellation of facts and dimensions. Each dimension is possibly sharedbetween several facts and it is organised according to multiple hierarchies. Inaddition, we define a comprehensive query algebra regrouping the more popularmultidimensional operations in current commercial systems and researchapproaches. We introduce new operators dedicated to a constellation. Finally,we describe a prototype that allows managers to query constellations of facts,dimensions and multiple hierarchies.

Towards Conceptual Multidimensional Design in Decision Support Systems