243 search results - page 15 / 49 » Selectivity Estimation for Boolean Queries |
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EDBT
2002
ACM
15 years 9 months ago
2002
ACM
Abstract. Estimating the sizes of query results, and intermediate results, is crucial to many aspects of query processing. In particular, it is necessary for effective query optimi...
AMW
2010
14 years 11 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
15 years 1 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
15 years 28 days 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...
DASFAA
2004
IEEE
15 years 1 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...