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RDF-3X: a RISC-style Engine for RDF


Neumann,  Thomas
Databases and Information Systems, MPI for Informatics, Max Planck Society;


Weikum,  Gerhard
Databases and Information Systems, MPI for Informatics, Max Planck Society;

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Neumann, T., & Weikum, G. (2008). RDF-3X: a RISC-style Engine for RDF. Proceedings of the VLDB Endowment, 1(1), 647-659. doi:10.1145/1453856.1453927.

RDF is a data representation format for schema-free structured information that is gaining momentum in the context of Semantic-Web corpora, life sciences, and also Web 2.0 platforms. The ``pay-as-you-go'' nature of RDF and the flexible pattern-matching capabilities of its query language SPARQL entail efficiency and scalability challenges for complex queries including long join paths. This paper presents the RDF-3X engine, an implementation of SPARQL that achieves excellent performance by pursuing a RISC-style architecture with a streamlined architecture and carefully designed, puristic data structures and operations. The salient points of RDF-3X are: 1) a generic solution for storing and indexing RDF triples that completely eliminates the need for physical-design tuning, 2) a powerful yet simple query processor that leverages fast merge joins to the largest possible extent, and 3) a query optimizer for choosing optimal join orders using a cost model based on statistical synopses for entire join paths. The performance of RDF-3X, in comparison to the previously best state-of-the-art systems, has been measured on several large-scale datasets with more than 50 million RDF triples and benchmark queries that include pattern matching and long join paths in the underlying data graphs.