On conjunctive queries containing inequalities
Journal of the ACM (JACM)
Finding nonrecursive envelopes for Datalog predicate
PODS '93 Proceedings of the twelfth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
PODS '94 Proceedings of the thirteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Answering queries using views (extended abstract)
PODS '95 Proceedings of the fourteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Answering queries using templates with binding patterns (extended abstract)
PODS '95 Proceedings of the fourteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Answering recursive queries using views
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Equivalences Among Relational Expressions with the Union and Difference Operators
Journal of the ACM (JACM)
SAC '97 Proceedings of the 1997 ACM symposium on Applied computing
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Obtaining Complete Answers from Incomplete Databases
VLDB '96 Proceedings of the 22th 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
A predicate-based caching scheme for client-server database architectures
The VLDB Journal — The International Journal on Very Large Data Bases
Optimal implementation of conjunctive queries in relational data bases
STOC '77 Proceedings of the ninth annual ACM symposium on Theory of computing
Query-answering algorithms for information agents
AAAI'96 Proceedings of the thirteenth national conference on Artificial intelligence - Volume 1
Complexity of answering queries using materialized views
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Logic-based techniques in data integration
Logic-based artificial intelligence
Answering queries using views: A survey
The VLDB Journal — The International Journal on Very Large Data Bases
Optimizing Recursive Information Gathering Plans in EMERAC
Journal of Intelligent Information Systems
A logic-based approach to data integration
Theory and Practice of Logic Programming
IEICE - Transactions on Information and Systems
Optimizing recursive information gathering plans
IJCAI'99 Proceedings of the 16th international joint conference on Artificial intelligence - Volume 2
Combining artificial intelligence and databases for data integration
Artificial intelligence today
MIKS: an agent framework supporting information access and integration
Intelligent information agents
Data integration with dependent sources
Proceedings of the 14th International Conference on Extending Database Technology
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We consider the problem of query plan optimization in information brokers. Information brokers are programs that facilitate access to collections of information sources by hiding source-specific peculiarities and presenting uniform query interfaces. It is unrealistic to assume that data stored by information sources is complete. Therefore, current implementations of information brokers query all possibly relevant information sources in order not to miss any answers. This approach is very costly. We show how a weaker form of completeness, local completeness, can be used to minimize the number of accesses to information sources.