777 search results - page 83 / 156 » Optimization of Relational Preference Queries |
COOPIS
2004
IEEE
14 years 1 months ago
2004
IEEE
Abstract. We consider the use of a cluster system for managing autonomous databases. In order to improve the performance of read-only queries, we strive to exploit user requirement...
W3C
1998
13 years 11 months ago
1998
An important application of XML is the interchange of electronic data (EDI) between multiple data sources on the Web. As XML data proliferates on the Web, applications will need t...
VLDB
2001
ACM
14 years 10 months ago
2001
ACM
The problem of answering queries using views is to find efficient methods of answering a query using a set of previously materialized views over the database, rather than accessing...
ICDT
2005
ACM
14 years 3 months ago
2005
ACM
We study the problem of rewriting queries using views in the presence of access patterns, integrity constraints, disjunction, and negation. We provide asymptotically optimal algori...
SSDBM
2002
IEEE
14 years 3 months ago
2002
IEEE
This paper presents an approach to answering queries over an ontology modelled using a description logic. The ontology acts as a global schema, providing a declarative description...