777 search results - page 142 / 156 » Optimization of Relational Preference Queries |
BTW
2009
Springer
14 years 8 days ago
2009
Springer
: Cost-based optimizers in relational databases make use of data statistics to estimate intermediate result cardinalities. Those cardinalities are needed to estimate access plan co...
SAC
2006
ACM
14 years 1 months ago
2006
ACM
This paper introduces the MTree index algorithm, a special purpose XML XPath index designed to meet the needs of the hierarchical XPath query language. With the increasing importa...
ICWN
2008
13 years 9 months ago
2008
: Problem statement: For a sensor network comprising autonomous and self-organizing data sources, efficient similarity-based search for semantic-rich resources (such as video data)...
ICDE
2006
IEEE
14 years 9 months ago
2006
IEEE
Wireless sensor networks are proving to be useful in a variety of settings. A core challenge in these networks is to minimize energy consumption. Prior database research has propo...
PODS
2007
ACM
14 years 7 months ago
2007
ACM
The generalized hypertree width GHW(H) of a hypergraph H is a measure of its cyclicity. Classes of conjunctive queries or constraint satisfaction problems whose associated hypergr...