The state of the art in distributed query processing
ACM Computing Surveys (CSUR)
Federated Database Systems for Managing Distributed, Heterogeneous, and Autonomous Databases
VLDB '91 Proceedings of the 17th International Conference on Very Large Data Bases
SPARQL basic graph pattern optimization using selectivity estimation
Proceedings of the 17th international conference on World Wide Web
Hexastore: sextuple indexing for semantic web data management
Proceedings of the VLDB Endowment
SP^2Bench: A SPARQL Performance Benchmark
ICDE '09 Proceedings of the 2009 IEEE International Conference on Data Engineering
Executing SPARQL Queries over the Web of Linked Data
ISWC '09 Proceedings of the 8th International Semantic Web Conference
The RDF-3X engine for scalable management of RDF data
The VLDB Journal — The International Journal on Very Large Data Bases
Data summaries for on-demand queries over linked data
Proceedings of the 19th international conference on World wide web
A semantic web middleware for virtual data integration on the web
ESWC'08 Proceedings of the 5th European semantic web conference on The semantic web: research and applications
Querying distributed RDF data sources with SPARQL
ESWC'08 Proceedings of the 5th European semantic web conference on The semantic web: research and applications
Linked data query processing strategies
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
SIHJoin: querying remote and local linked data
ESWC'11 Proceedings of the 8th extended semantic web conference on The semantic web: research and applications - Volume Part I
Semantics and optimization of the SPARQL 1.1 federation extension
ESWC'11 Proceedings of the 8th extended semantic web conference on The semanic web: research and applications - Volume Part II
FedX: a federation layer for distributed query processing on linked open data
ESWC'11 Proceedings of the 8th extended semantic web conference on The semanic web: research and applications - Volume Part II
Database foundations for scalable RDF processing
RW'11 Proceedings of the 7th international conference on Reasoning web: semantic technologies for the web of data
FedBench: a benchmark suite for federated semantic data query processing
ISWC'11 Proceedings of the 10th international conference on The semantic web - Volume Part I
FedBench: a benchmark suite for federated semantic data query processing
ISWC'11 Proceedings of the 10th international conference on The semantic web - Volume Part I
Semantic navigation on the web of data: specification of routes, web fragments and actions
Proceedings of the 21st international conference on World Wide Web
Database techniques for linked data management
SIGMOD '12 Proceedings of the 2012 ACM SIGMOD International Conference on Management of Data
Towards benefit-based RDF source selection for SPARQL queries
SWIM '12 Proceedings of the 4th International Workshop on Semantic Web Information Management
SPARQL-RW: transparent query access over mapped RDF data sources
Proceedings of the 15th International Conference on Extending Database Technology
Sharing statistics for SPARQL federation optimization, with emphasis on benchmark quality
ESWC'12 Proceedings of the 9th international conference on The Semantic Web: research and applications
Freshening up while staying fast: towards hybrid SPARQL queries
EKAW'12 Proceedings of the 18th international conference on Knowledge Engineering and Knowledge Management
SPLODGE: systematic generation of SPARQL benchmark queries for linked open data
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part I
Link discovery with guaranteed reduction ratio in affine spaces with minkowski measures
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part I
Hybrid SPARQL queries: fresh vs. fast results
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part I
Benchmarking federated SPARQL query engines: are existing testbeds enough?
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part II
Federating queries in SPARQL 1.1: Syntax, semantics and evaluation
Web Semantics: Science, Services and Agents on the World Wide Web
Structure inference for linked data sources using clustering
Proceedings of the Joint EDBT/ICDT 2013 Workshops
KGRAM Versatile Inference and Query Engine for the Web of Linked Data
WI-IAT '12 Proceedings of the The 2012 IEEE/WIC/ACM International Joint Conferences on Web Intelligence and Intelligent Agent Technology - Volume 01
Colledge: a vision of collaborative knowledge networks
Proceedings of the 2nd International Workshop on Semantic Search over the Web
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Motivated by the ongoing success of Linked Data and the growing amount of semantic data sources available on theWeb, new challenges to query processing are emerging. Especially in distributed settings that require joining data provided by multiple sources, sophisticated optimization techniques are necessary for efficient query processing. We propose novel join processing and grouping techniques to minimize the number of remote requests, and develop an effective solution for source selection in the absence of preprocessed metadata. We present FedX, a practical framework that enables efficient SPARQL query processing on heterogeneous, virtually integrated Linked Data sources. In experiments, we demonstrate the practicability and efficiency of our framework on a set of real-world queries and data sources from the Linked Open Data cloud. With FedX we achieve a significant improvement in query performance over state-of-the-art federated query engines.