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@inproceedings{DBLP:conf/sigmod/TomasicABKNR97,
author = {Anthony Tomasic and
R{\'e}my Amouroux and
Philippe Bonnet and
Olga Kapitskaia and
Hubert Naacke and
Louiqa Raschid},
editor = {Joan Peckham},
title = {The Distributed Information Search Component (Disco) and the
World Wide Web},
booktitle = {SIGMOD 1997, Proceedings ACM SIGMOD International Conference
on Management of Data, May 13-15, 1997, Tucson, Arizona, USA},
publisher = {ACM Press},
year = {1997},
pages = {546-548},
ee = {http://doi.acm.org/10.1145/253260.253402, db/conf/sigmod/TomasicABKNR97.html},
crossref = {DBLP:conf/sigmod/97},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
The Distributed Information Search COmponent (DISCO) is a prototype heterogeneous distributed database that accesses underlying data sources. The DISCO prototype currently focuses on three central research problems in the context of these systems. First, since the capabilities of each data source is different, transforming queries into subqueries on data source is difficult. We call this problem the weak data source problem. Second, since each data source performs operations in a generally unique way, the cost for performing an operation may vary radically from one wrapper to another. We call this problem the radical cost problem. Finally, existing systems behave rudely when attempting to access an unavailable data source. We call this problem the ungraceful failure problem.
DISCO copes with these problems. For the weak data source problem, the database implementor defines precisely the capabilities of each data source. For the radical cost problem, the database implementor (optionally) defines cost information for some of the operations of a data source. The mediator uses this cost information to improve its cost model. To deal with ungraceful failures, queries return partial answers. A partial answer contains the part of the final answer to the query that was produced by the available data sources. The current working prototype of DISCO contains implementations of these solutions and operations over a collection of wrappers that access information both in files and on the World Wide Web.
Copyright © 1997 by the ACM, Inc., used by permission. Permission to make digital or hard copies is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice on the first page or initial screen of a display along with the full citation.
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SIGMOD Record 26(2),
June 1997