D. J. Abadi, A. Marcus, S. R. Madden, and K. Hollenbach, interesting strategies, and evaluated them through a set of experiments, which confirm the feasibility and the interest of our approach In future works, we plan to refine our quality functions, integrating query cardinality estimations, and experiment with more heuristics Scalable semantic web data management using vertical partitioning, VLDB, 2007.

B. Amann, C. Beeri, I. Fundulaki, and M. Scholl, Ontology-Based Integration of XML Web Resources, ISWC, 2002.
DOI : 10.1007/3-540-48005-6_11

URL : https://hal.archives-ouvertes.fr/hal-01124694

A. K. Chandra and P. M. Merlin, Optimal implementation of conjunctive queries in relational data bases, Proceedings of the ninth annual ACM symposium on Theory of computing , STOC '77, 1977.
DOI : 10.1145/800105.803397

S. Chaudhuri and M. Y. Vardi, Optimization of real conjunctive queries, Proceedings of the twelfth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems , PODS '93, 1993.
DOI : 10.1145/153850.153856

A. Chebotko, S. Lu, and F. Fotouhi, Semantics preserving SPARQL-to-SQL translation, Data & Knowledge Engineering, vol.68, issue.10, 2009.
DOI : 10.1016/j.datak.2009.04.001

B. Elliott, E. Cheng, C. Thomas-ogbuji, and Z. M. Ozsoyoglu, A complete translation from SPARQL into efficient SQL, Proceedings of the 2009 International Database Engineering & Applications Symposium on, IDEAS '09, 2009.
DOI : 10.1145/1620432.1620437

A. Gupta, I. S. Mumick, and V. S. Subrahmanian, Maintaining views incrementally, SIGMOD, 1993.

A. Y. Halevy, Answering queries using views: A survey, The VLDB Journal, vol.10, issue.4, 2001.
DOI : 10.1007/s007780100054

V. Harinarayan, A. Rajaraman, and J. D. Ullman, Implementing data cubes efficiently, SIGMOD, 1996.

A. Maduko, K. Anyanwu, A. P. Sheth, and P. Schliekelman, Graph Summaries for Subgraph Frequency Estimation, ESWC, 2008.
DOI : 10.1007/978-3-540-68234-9_38

T. Neumann and G. Weikum, RDF-3X, Proc. of VLDB, 2008.
DOI : 10.14778/1453856.1453927

T. Neumann and G. Weikum, Scalable join processing on very large RDF graphs, Proceedings of the 35th SIGMOD international conference on Management of data, SIGMOD '09, 2009.
DOI : 10.1145/1559845.1559911

D. Quass, A. Rajaraman, J. D. Ullman, J. Widom, and Y. Sagiv, Querying semistructured heterogeneous information, Journal of Systems Integration, vol.7, issue.3, 1997.
DOI : 10.1007/3-540-60608-4_48

L. Sidirourgos, R. Goncalves, M. Kersten, N. Nes, and S. Manegold, Column-store support for RDF data management, Proc. of VLDB, 2008.
DOI : 10.14778/1454159.1454227

M. Stocker, A. Seaborne, A. Bernstein, C. Kiefer, and D. Reynolds, SPARQL basic graph pattern optimization using selectivity estimation, Proceeding of the 17th international conference on World Wide Web , WWW '08, 2008.
DOI : 10.1145/1367497.1367578

D. Theodoratos, S. Ligoudistianos, and T. K. Sellis, View selection for designing the global data warehouse, Data & Knowledge Engineering, vol.39, issue.3, 2001.
DOI : 10.1016/S0169-023X(01)00041-6

C. Weiss, P. Karras, and A. Bernstein, Hexastore, Proc. of VLDB, 2008.
DOI : 10.14778/1453856.1453965

S. Query-language-for and R. , Available at www.w3.org/TR/rdf-sparql-query, 2008.