The converging trend of relational database technology and object-oriented database technology results in object-relational (OR) database systems, which extend the relational systems with add-on object features. Efforts from both academic research and industry have been directed into object-relational database systems. In this paper, we adopt an approach for implementing object-relational database systems by using a heterogeneous database system architecture. We propose a procedure to partition a global OR query into a group of relational and object-oriented sub-queries on local databases so that it can be processed without a specialised query engine. The correctness of this query translation is also shown.
International Journal of Information Technology,
Vol. 5, no. 1 (1999), pp. 114-148