Abstract
An approach is described to heterogeneous distributed database management system (DBMS) design, and a prototype implementation based on this approach called the multiple database access system (MDAS) is presented. This system acts as a frontend to multiple local DBMSs, which continue to perform all data processing. The current MDAS implementation involves two different commercial microcomputer-based local DBMSs residing on separate machines, which are joined by a serial connection. The MDAS services queries on an integrated view of semantically related databases exhibiting a range of schema and data conflicts.
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