[{"creator":{"login":"ngonga","id":"65716"},"date_updated":"2024-01-13T11:40:25Z","language":[{}],"dc":{"creator":["Qudus, Umair","Saleem, Muhammad","Ngonga Ngomo, Axel-Cyrille","Lee, Young-Koo"],"source":["Qudus U, Saleem M, Ngonga Ngomo A-C, Lee Y-K. An Empirical Evaluation of Cost-based Federated SPARQL Query Processing Engines. Semantic Web. 12(6):843-868. doi:10.3233/SW-200420"],"relation":["info:eu-repo/semantics/altIdentifier/doi/10.3233/SW-200420","info:eu-repo/semantics/altIdentifier/issn/2210-4968","info:eu-repo/grantAgreement/EC/860801"],"description":["Finding a good query plan is key to the optimization of query runtime. This holds in particular for cost-based federation\r\nengines, which make use of cardinality estimations to achieve this goal. A number of studies compare SPARQL federation engines across different performance metrics, including query runtime, result set completeness and correctness, number of sources selected and number of requests sent. Albeit informative, these metrics are generic and unable to quantify and evaluate the accuracy of the cardinality estimators of cost-based federation engines. To thoroughly evaluate cost-based federation engines, the effect of estimated cardinality errors on the overall query runtime performance must be measured. In this paper, we address this challenge by presenting novel evaluation metrics targeted at a fine-grained benchmarking of cost-based federated SPARQL query engines. We evaluate five cost-based federated SPARQL query engines using existing as well as novel evaluation metrics by using LargeRDFBench queries. Our results provide a detailed analysis of the experimental outcomes that reveal novel insights, useful for the development of future cost-based federated SPARQL query processing engines."],"type":["info:eu-repo/semantics/article","doc-type:article","text","http://purl.org/coar/resource_type/c_6501"],"language":["eng"],"subject":["SPARQL","benchmarking","cost-based","cost-free","federated","querying","ddc:000"],"rights":["info:eu-repo/semantics/closedAccess"],"title":["An Empirical Evaluation of Cost-based Federated SPARQL Query Processing Engines"],"date":["2021"],"identifier":["https://ris.uni-paderborn.de/record/25212"],"publisher":["ISO Press"]},"publication_identifier":{"issn":[]},"dini_type":"doc-type:article","publication_status":"accepted","project":[{"name":"KnowGraphs: KnowGraphs: Knowledge Graphs at Scale","_id":"410"}],"department":[{"tree":[{"_id":"7"},{"_id":"34"},{"_id":"44"},{"_id":"43"}],"_id":"574"}],"issue":"6","intvolume":" 12","_id":"25212","uri_base":"https://ris.uni-paderborn.de","page":"843-868","citation":{"ieee":"U. Qudus, M. Saleem, A.-C. Ngonga Ngomo, and Y.-K. Lee, “An Empirical Evaluation of Cost-based Federated SPARQL Query Processing Engines,” Semantic Web, vol. 12, no. 6, pp. 843–868, doi: 10.3233/SW-200420.","short":"U. Qudus, M. Saleem, A.-C. Ngonga Ngomo, Y.-K. Lee, Semantic Web 12 (n.d.) 843–868.","mla":"Qudus, Umair, et al. “An Empirical Evaluation of Cost-Based Federated SPARQL Query Processing Engines.” Semantic Web, vol. 12, no. 6, ISO Press, pp. 843–68, doi:10.3233/SW-200420.","bibtex":"@article{Qudus_Saleem_Ngonga Ngomo_Lee, title={An Empirical Evaluation of Cost-based Federated SPARQL Query Processing Engines}, volume={12}, DOI={10.3233/SW-200420}, number={6}, journal={Semantic Web}, publisher={ISO Press}, author={Qudus, Umair and Saleem, Muhammad and Ngonga Ngomo, Axel-Cyrille and Lee, Young-Koo}, pages={843–868} }","chicago":"Qudus, Umair, Muhammad Saleem, Axel-Cyrille Ngonga Ngomo, and Young-Koo Lee. “An Empirical Evaluation of Cost-Based Federated SPARQL Query Processing Engines.” Semantic Web 12, no. 6 (n.d.): 843–68. https://doi.org/10.3233/SW-200420.","apa":"Qudus, U., Saleem, M., Ngonga Ngomo, A.-C., & Lee, Y.-K. (n.d.). An Empirical Evaluation of Cost-based Federated SPARQL Query Processing Engines. Semantic Web, 12(6), 843–868. https://doi.org/10.3233/SW-200420"},"type":"journal_article","ddc":[],"user_id":"83392","abstract":[{"lang":"eng"}],"article_type":"original","volume":12,"date_created":"2021-10-01T06:52:52Z","status":"public","has_accepted_license":"1","keyword":[],"publication":"Semantic Web","file_date_updated":"2024-01-13T11:35:53Z","author":[{"first_name":"Umair","last_name":"Qudus","id":"83392"},{"last_name":"Saleem","first_name":"Muhammad"},{"first_name":"Axel-Cyrille","last_name":"Ngonga Ngomo","id":"65716"},{"last_name":"Lee","first_name":"Young-Koo"}],"file":[{"access_level":"closed","date_created":"2024-01-13T11:35:53Z","file_name":"swj2604.pdf","date_updated":"2024-01-13T11:35:53Z","content_type":"application/pdf","relation":"main_file","success":1,"file_size":978478,"creator":"uqudus","file_id":"50483"}]}]