A Cost-based Optimizer for SPARQL Queries.
Edna Ruckhaus, María-Esther Vidal, Eduardo J. Ruiz, Javier E. Sierra · 2008
The cost of answering a query against an ontology is affected by at least three elements: the size of the ontology, the strategy followed to combine the data, and the order or plan in which data is processed. In the context of the Semantic Web, very large ontologies have been defined; therefore, techniques to identify