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Access to indexed hierarchical databases using a relational query language

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2 Author(s)
Chung, C.-W. ; General Motors Res. Lab., Warren, MI, USA ; McCloskey, K.E.

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

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Knowledge and Data Engineering, IEEE Transactions on  (Volume:5 ,  Issue: 1 )