An access specification language for a relational data base system

Authors:
Raymond A. Lorie;Jorgen F. Nilsson
Affiliations:
IBM Research Division laboratory, San Jose, California;-
Venue:
IBM Journal of Research and Development
Year:
1979

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Abstract

We address the problem of executing high level language queries submitted to a relational data base system. As a step in the process of constructing an "efficient" complier for a high level language we suggest the elaboration of an intermediate level language acting as a target language for the optimizer part of the complier. This language may be conceived as one of several levels in a chain of abstract machines mapping a nonprocedural relational language onto primitive data base access operations. It is our conjecture that the introducing of an access specification language provides a conceptual platform facilities the handling of the "optimization" problem.