Congenial Benchmarking of RDF Storage Solutions.

Many SPARQL benchmark generation techniques rely on SPARQL query templates or on selecting representative queries from a set of input queries by inspecting their syntactic features. Hence, prototype queries from such benchmarks mainly capture combinations of SPARQL features, but not the semantics nor the conceptual association between queries. We present congenial benchmarks---a novel type of benchmark that can detect conceptual associations and thus reflect prototypical user intentions when selecting prototype queries. We study SPARROW, an instantiation of congenial benchmarks, where the conceptual associations of SPARQL queries are measured by concept similarity measures. To this end, we transform unary acyclic conjunctive SPARQL queries into ELH-description logic concepts. Our evaluation of three popular triple stores on two datasets shows that the benchmarks generated by SPARROW differ considerably from benchmarks generated using a feature-based approach. Moreover, our evaluation suggests that SPARROW can characterize the performance of common triple stores with respect to user needs by exploiting conceptual associations to detect prototypical user needs.