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{{Publikation Details | {{Publikation Details |
Aktuelle Version vom 18. Juni 2012, 16:49 Uhr
Veröffentlichung: 2012
Mai
Art der Veröffentlichung: 9th Extended Semantic Web Conference (ESWC) Demo Session
BibTeX
Kurzfassung
We present DEFENDER and illustrate the benefits of iden-
tifying promising query decompositions and efficient plans that combine results from federations of SPARQL endpoints. DEFENDER is a query decomposer that implements a two-fold approach. First triple patterns in a SPARQL query are decomposed into simple sub-queries that can be
completely executed on one endpoint. Second, sub-queries are combined into a feasible bushy tree plan where the number of joins is maximized
and the height of tree is minimized. We demonstrate DEFENDER and compare its performance with respect to state-of-the-art RDF engines for queries of diverse complexity, networks with different delays, and dataset differently distributed among a variety of endpoints.
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