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Automatic Design of the Internal Schema for a CODASYL Database System

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2 Author(s)
Reuter, Andreas ; IBM Research Laboratory, San Jose, CA 95193; University of Kaiserslautern, Kaiserslautern, West Germany. ; Kinzinger, Horst

This paper describes the concepts and implementation of a design aid for the internal schema of an existing CODASYL-like database system. It allows for tailoring the storage structure level to a given logical schema and a specified workload. According to the 1978 CODASYL report, our DBMS provides two levels of schema declaration, the DDL-level for logical schema description and a DSDL-like level for specifying the storage structures to implement the objects of the logical schema. The repertoire of storage structures supported by our system is a good internal schema are basically heuristic. This approaach is justified by weighing its advantages and shortcomings against those of analytic models and simulation. Finally, some preliminary user experiences with a pilot version are related.

Published in:

Software Engineering, IEEE Transactions on  (Volume:SE-10 ,  Issue: 4 )

Date of Publication:

July 1984

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