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Journal of Intelligent Information Systems, 16, 149187, 2001 c 2001 Kluwer Academic Publishers. Manufactured in The Netherlands.
 

Summary: Journal of Intelligent Information Systems, 16, 149­187, 2001
c 2001 Kluwer Academic Publishers. Manufactured in The Netherlands.
Compiling Source Descriptions for Efficient
and Flexible Information Integration
JOS´E LUIS AMBITE ambite@isi.edu
CRAIG A. KNOBLOCK knoblock@isi.edu
ION MUSLEA muslea@isi.edu
ANDREW G. PHILPOT philpot@isi.edu
Information Sciences Institute, Integrated Media Systems Center, and Department of Computer Science, University
of Southern California, 4676 Admiralty Way, Marina del Rey, CA 90292
Abstract. Integrating data from heterogeneous data sources is a critical problem that has received a great deal of
attention in recent years. There are two competing approaches to address this problem. The traditional approach,
which first appeared in Multibase and more recently in HERMES and TSIMMIS, often called global-as-view,
defines the global model as a view on the sources. A more recent approach, sometimes referred to as local-as-view
or view rewriting, defines the sources as views on the global model. The disadvantage of the first approach is
that a person must re-engineer the definitions of the global model whenever any of the sources change or when
new sources are added. The view rewriting approach does not suffer from this drawback, but the problem of
rewriting queries into equivalent plans using views is computationally hard and must be performed for each query
at run-time.
In this paper we propose a hybrid approach that amortizes the cost of query processing over all queries by

  

Source: Ambite, José Luis - Information Sciences Institute & Department of Computer Science, University of Southern California

 

Collections: Computer Technologies and Information Sciences