A complete framework for enumerating and classifying the types of multidatabase system (mDBS) structural and representational discrepancies is developed. The framework is structured according to a relational database ...
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A complete framework for enumerating and classifying the types of multidatabase system (mDBS) structural and representational discrepancies is developed. The framework is structured according to a relational database schema and is both practical and complete. It was used to build the unisql/m commercial multidatabase system. This mDBS was built over Structured-Query-Language-based relational database systems and a unified relational and object-oriented database system named unisql/X. However, the results are substantially applicable to heterogeneous database systems that use a nonrelational data model (for example, an object-oriented data model) as the common data model and allow the formulation of queries directly against the component database schemas
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