304 search results - page 18 / 61 » Selectivity Estimation of Window Queries |
AMW
2010
13 years 9 months ago
2010
In this work we present in-network techniques to improve the efficiency of spatial aggregate queries. Such queries are very common in a sensornet setting, demanding more targeted t...
SIGMOD
1996
ACM
13 years 12 months ago
1996
ACM
Many commercial database systems maintain histograms to summarize the contents of relations and permit efficient estimation of query result sizes and access plan costs. Although s...
CIKM
2009
Springer
13 years 11 months ago
2009
Springer
Federated text search provides a unified search interface for multiple search engines of distributed text information sources. Resource selection is an important component for fed...
NIPS
2004
13 years 9 months ago
2004
A new distance measure between probability density functions (pdfs) is introduced, which we refer to as the Laplacian pdf distance. The Laplacian pdf distance exhibits a remarkabl...
DASFAA
2004
IEEE
13 years 11 months ago
2004
IEEE
Abstract. We consider the problem of accurately estimating the number of approximate XML answers for a given query, and propose an efficient method that (1) accurately computes sel...