Titlebook: Data Warehousing and Knowledge Discovery; 16th International C Ladjel Bellatreche,Mukesh K. Mohania Conference proceedings 2014 The Editor(

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OntoWarehousing – Multidimensional Design Supported by a Foundational Ontology: A Temporal Perspectiach for the derivation of MD schemas, using categories from a foundational ontology (FO) to analyse the data source domains as a well-founded ontology. The approach is exemplified through a real scenario of the Brazilian electrical system, supporting the joint exploration of electrical disturbances data and their possible repercussion on the news.

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Reducing Multidimensional Data experiments and discuss their results. Evaluating our solution implies executing different requests in various contexts: unreduced single fact table, unreduced relational star schema, reduced star schema or reduced snowflake schema. We show that queries are more efficiently calculated within a reduced star schema.