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<p>An efficient means of accessing indexed hierarchical databases using a relational query language is presented. The purpose is to achieve an effective sharing of heterogeneous distributed databases. Translation of hierarchical data to an equivalent relational data definition, translation of a relational query language statement to an equivalent program that can be processed by a hierarchical database management system, and automatic selection of secondary indexes of hierarchical databases are investigated. A major portion of the result has been implemented, and the performance of the implemented system is analyzed. The performance of the system is satisfactory for a wide range of test data and test queries. It is shown that the utilization of the secondary index significantly enhances the efficiency in accessing hierarchical databases.</p>
indexed hierarchical databases; relational query language; heterogeneous distributed databases; secondary indexes; test data; test queries; distributed databases; query languages; relational databases

C. Chung and K. McCloskey, "Access to Indexed Hierarchical Databases Using a Relational Query Language," in IEEE Transactions on Knowledge & Data Engineering, vol. 5, no. , pp. 155-161, 1993.
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