285 search results - page 18 / 57 » Optimization of Real Conjunctive Queries |
SIGECOM
2008
ACM
14 years 9 months ago
2008
ACM
We consider the problem of query rewrites in the context of keyword advertisement. Given a three-layer graph consisting of queries, query rewrites, and the corresponding ads that ...
181
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SIGIR
2011
ACM
14 years 14 days ago
2011
ACM
Large search engines process thousands of queries per second over billions of documents, making query processing a major performance bottleneck. An important class of optimization...
151
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GIS
2006
ACM
15 years 10 months ago
2006
ACM
This paper presents a query optimizer module based on cost estimation that chooses the best filtering step algorithm to perform a specific spatial join operation. A set of express...
108
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CVPR
2009
IEEE
16 years 4 months ago
2009
IEEE
We describe an algorithm for similar-image search which
is designed to be efficient for extremely large collections of
images. For each query, a small response set is selected by...
OWLED
2008
14 years 11 months ago
2008
Abstract. We present Owlgres, a DL-Lite reasoner implementation written for PostgreSQL, a mature open source database. Owlgres is an OWL reasoner that provides consistency checking...