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A study of optimization and Rule/Goal Graph for a logical query

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Abstract

Static optimization of logical queries is, in substance, to move selections down as far as possible in evaluating logical queries. This paper extends Ullman's RGG (Rule/Goal Graph)[6] and introduces P-graph, with which a wide range of recursive logical queries can be statically optimized top-down and evaluated bottom-up, some of which are usually optimized by dynamic approaches. The paper also shows that for some logical queries the complexity of pushing selections down and computing bottom-up is related to the complexity of base relation in the queries.

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References

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Authors and Affiliations

  1. Computing Center, Hebei University, 071002, Baoding

    Tianzhu Li

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  1. Tianzhu Li
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Li, T. A study of optimization and Rule/Goal Graph for a logical query. J. of Comput. Sci. & Technol. 7, 356–362 (1992). https://doi.org/10.1007/BF02943552

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  • DOI: https://doi.org/10.1007/BF02943552

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