DATAPLEX: an access to heterogeneous distributed databases
Communications of the ACM
A relational model of data for large shared data banks
Communications of the ACM
Design of relational views over network schemas
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
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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.