RDF data-centric storage

Justin J. Levandoski, Mohamed Mokbel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

46 Citations (Scopus)


The vision of the Semantic Web has brought about new challenges at the intersection of web research and data management. One fundamental research issue at this intersection is the storage of the Resource Description Framework (RDF) data: the model at the core of the Semantic Web. We present a data-centric approach for storage of RDF in relational databases. The intuition behind our approach is that each RDF dataset requires a tailored table schema that achieves efficient query processing by (1) reducing the need for joins in the query plan and (2) keeping null storage below a given threshold. Using a basic structure derived from the RDF data, we propose a two-phase algorithm involving clustering and partitioning. The clustering phase aims to reduce the need for joins in a query. The partitioning phase aims to optimize storage of extra (i.e., null) data in the underlying relational database. Our approach does not assume a particular query workload, relevant for RDF knowledge bases with a large number of ad-hoc queries. Extensive experimental evidence using three publicly available real-world RDF data sets (i.e., DBLP, DBPedia, and Uniprot) shows that our schema creation technique provides superior query processing performance compared to state-of-the art storage approaches. Further, our approach is easily implemented, and complements existing RDF-specific databases.

Original languageEnglish
Title of host publication2009 IEEE International Conference on Web Services, ICWS 2009
Number of pages8
Publication statusPublished - 19 Nov 2009
Externally publishedYes
Event2009 IEEE International Conference on Web Services, ICWS 2009 - Los Angeles, CA, United States
Duration: 6 Jul 200910 Jul 2009


Other2009 IEEE International Conference on Web Services, ICWS 2009
CountryUnited States
CityLos Angeles, CA


ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Software

Cite this

Levandoski, J. J., & Mokbel, M. (2009). RDF data-centric storage. In 2009 IEEE International Conference on Web Services, ICWS 2009 (pp. 911-918). [5175913] https://doi.org/10.1109/ICWS.2009.49