In this paper we present some of the results achieved while realizing an international research project aiming at the design and development of an Object–Relational Data Warehousing System (ORDAWA). Important goals of the project are to develop techniques for the integration and consolidation of different external data sources in an object–relational data warehouse, the construction and maintenance of materialized relational as well as object–oriented views, index structures, query transformations and optimizations, and techniques of data mining. The achievements discussed in this paper concern the application of materialized object–oriented views in the process of building an object–relational data warehouse.

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