A federated architecture for information management
ACM Transactions on Information Systems (TOIS)
Communications of the ACM
A comparative analysis of methodologies for database schema integration
ACM Computing Surveys (CSUR)
Grammar-like functional rules for representing query optimization alternatives
SIGMOD '88 Proceedings of the 1988 ACM SIGMOD international conference on Management of data
Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Query evaluation techniques for large databases
ACM Computing Surveys (CSUR)
Pegasus architecture and design principles
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
Communications of the ACM
Query caching and optimization in distributed mediator systems
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
The TSIMMIS Approach to Mediation: Data Models and Languages
Journal of Intelligent Information Systems - Special issue: next generation information technologies and systems
Information gathering in the World-Wide Web: the W3QL query language and the W3QS system
ACM Transactions on Database Systems (TODS)
Principles of distributed database systems (2nd ed.)
Principles of distributed database systems (2nd ed.)
Cluster I/O with River: making the fast case common
Proceedings of the sixth workshop on I/O in parallel and distributed systems
An adaptive query execution system for data integration
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
Query optimization in the presence of limited access patterns
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
SAC '97 Proceedings of the 1997 ACM symposium on Applied computing
Eddies: continuously adaptive query processing
SIGMOD '00 Proceedings of the 2000 ACM SIGMOD international conference on Management of data
Distributed and Parallel Databases
Ontological Approach for Information Discovery in Internet Databases
Distributed and Parallel Databases
Interconnecting Heterogeneous Information Systems
Interconnecting Heterogeneous Information Systems
Multidatabase Systems: An Advance Solution for Global Information Sharing
Multidatabase Systems: An Advance Solution for Global Information Sharing
Quality of Service Issues in Internet Web Services
IEEE Transactions on Computers
Access path selection in a relational database management system
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
Guest Editors' Introduction: Database Technology on the Web
IEEE Internet Computing
View Integration: A Step Forward in Solving Structural Conflicts
IEEE Transactions on Knowledge and Data Engineering
WebOQL: Restructuring Documents, Databases, and Webs
ICDE '98 Proceedings of the Fourteenth International Conference on Data Engineering
Don't Scrap It, Wrap It! A Wrapper Architecture for Legacy Data Sources
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Optimizing Queries Across Diverse Data Sources
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Quality-driven Integration of Heterogenous Information Systems
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
Cost Models DO Matter: Providing Cost Information for Diverse Data Sources in a Federated System
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
Query Optimization in a Heterogeneous DBMS
VLDB '92 Proceedings of the 18th International Conference on Very Large Data Bases
Querying Heterogeneous Information Sources Using Source Descriptions
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Calibrating the Query Optimizer Cost Model of IRO-DB, an Object-Oriented Federated Database System
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Querying XML Sources Using an Ontology-Based Mediator
On the Move to Meaningful Internet Systems, 2002 - DOA/CoopIS/ODBASE 2002 Confederated International Conferences DOA, CoopIS and ODBASE 2002
Large Multidatabases: Issues and Directions
Proceedings of the IFIP WG 2.6 Database Semantics Conference on Interoperable Database Systems (DS-5)
Leveraging Mediator Cost Models with Heterogeneous Data Sources
ICDE '98 Proceedings of the Fourteenth International Conference on Data Engineering
ObjectGlobe: Ubiquitous query processing on the Internet
The VLDB Journal — The International Journal on Very Large Data Bases
Scaling heterogeneous databases and the design of Disco
ICDCS '96 Proceedings of the 16th International Conference on Distributed Computing Systems (ICDCS '96)
Semantic Brokering over Dynamic Heterogeneous Data Sources in InfoSleuth(tm)
ICDE '99 Proceedings of the 15th International Conference on Data Engineering
Capability-Sensitive Query Processing on Internet Sources
ICDE '99 Proceedings of the 15th International Conference on Data Engineering
Dynamic Query Scheduling in Data Integration Systems
ICDE '00 Proceedings of the 16th International Conference on Data Engineering
Automated Support for Quality Requirements in Web-Service-Based Systems
FTDCS '01 Proceedings of the 8th IEEE Workshop on Future Trends of Distributed Computing Systems
Query planning and optimization in information integration
Query planning and optimization in information integration
Efficient Access to Web Services
IEEE Internet Computing
Query optimization over web services
VLDB '06 Proceedings of the 32nd international conference on Very large data bases
Mobile join operators for restricted sources
Mobile Information Systems
Mapping filtering streaming applications with communication costs
Proceedings of the twenty-first annual symposium on Parallelism in algorithms and architectures
A Vision for Next Generation Query Processors and an Associated Research Agenda
Globe '09 Proceedings of the 2nd International Conference on Data Management in Grid and Peer-to-Peer Systems
Dynamic query optimisation: towards decentralised methods
International Journal of Intelligent Information and Database Systems
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The advent of the Internet and the Web and their subsequent ubiquity have brought forth opportunities to connect information sources across all types of boundaries (local, regional, organizational, etc.). Examples of such information sources include databases, XML documents, and other unstructured sources. Uniformly querying those information sources has been extensively investigated. A major challenge relates to query optimization. Indeed, querying multiple information sources scattered on the Web raises several barriers for achieving efficiency. This is due to the characteristics of Web information sources that include volatility, heterogeneity, and autonomy. Those characteristics impede a straightforward application of classical query optimization techniques. They add new dimensions to the optimization problem such as the choice of objective function, selection of relevant information sources, limited query capabilities, and unpredictable events. In this paper, we survey the current research on fundamental problems to efficiently process queries over Web data integration systems. We also outline a classification for optimization techniques and a framework for evaluating them.