Abstract
In this paper we present the organization of a predicate-based query cache suitable for integration with agent-based heterogeneous database systems. The cache is managed using a tractable (sound and complete) query containment algorithm, yet there are no language restrictions placed on the applications. This is accomplished by introducing query approximation.
Query approximation is a compilation technique where a query expression in a general query language is mapped to a query expression in a restricted language. We define a target language such that query containment can be tested in polynomial time. We specify the algorithms by which the query engine and the cache manager may negotiate a choice of approximation and the development of a query plan. We use two application workloads and the TPC-D benchmark queries to assess the value of the cache within the architecture of the InfoSleuth heterogeneous database system.
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Miranker, D., Taylor, M.C., Padmanaban, A. (2002). A Tractable Query Cache by Approximation. In: Koenig, S., Holte, R.C. (eds) Abstraction, Reformulation, and Approximation. SARA 2002. Lecture Notes in Computer Science(), vol 2371. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45622-8_11
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DOI: https://doi.org/10.1007/3-540-45622-8_11
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