712 search results - page 11 / 143 » Decoupled Query Optimization for Federated Database Systems |
CIKM
2001
Springer
15 years 2 months ago
2001
Springer
Existing approaches for optimizing queries in data integration use decoupled strategies–attempting to optimize coverage and cost in two separate phases. Since sources tend to ha...
WWW
2009
ACM
15 years 10 months ago
2009
ACM
Web search engines often federate many user queries to relevant structured databases. For example, a product related query might be federated to a product database containing thei...
PODS
2004
ACM
15 years 9 months ago
2004
ACM
The problem of deciding query containment has important applications in classical query optimization and heterogeneous database systems. Query containment is undecidable for unres...
ICA3PP
2010
Springer
15 years 2 months ago
2010
Springer
Abstract. Cloud computing providers have setup several data centers at different geographical locations over the Internet in order to optimally serve needs of their customers aroun...
SIGMOD
2000
ACM
15 years 1 months ago
2000
ACM
Continuous queries are persistent queries that allow users to receive new results when they become available. While continuous query systems can transform a passive web into an ac...