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Erschienen in:
2007 | OriginalPaper | Buchkapitel
The SPARQL Query Graph Model for Query Optimization
verfasst von : Olaf Hartig, Ralf Heese
Erschienen in: The Semantic Web: Research and Applications
Verlag: Springer Berlin Heidelberg
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The Semantic Web community has proposed several query languages for RDF before the World Wide Web Consortium started to standardize SPARQL. Due to the declarative nature of the query language, a query engine should be responsible to choose an efficient evaluation strategy. Although all RDF repositories provide query capabilities, some of them require manual interaction to reduce query execution time by several orders of magnitude.
In this paper, we propose the SPARQL query graph model (SQGM) supporting all phases of query processing. On top of the SQGM we defined transformations rules to simplify and to rewrite a query. Based on these rules we developed heuristics to achieve an efficient query execution plan. Experiments illustrate the potential of our approach.