217 search results - page 34 / 44 » An optimization for query answering on ALC database |
SIGMOD
1998
ACM
15 years 3 months ago
1998
ACM
Query optimization is an integral part of relational database management systems. One important task in query optimization is selectivity estimation, that is, given a query P, we ...
124
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WWW
2011
ACM
14 years 6 months ago
2011
ACM
The problem of answering SPARQL queries over virtual SPARQL views is commonly encountered in a number of settings, including while enforcing security policies to access RDF data, ...
155
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SIGMOD
2008
ACM
15 years 11 months ago
2008
ACM
Structured peer-to-peer (P2P) overlays have been successfully employed in many applications to locate content. However, they have been less effective in handling massive amounts o...
134
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DASFAA
2010
IEEE
15 years 3 months ago
2010
IEEE
This paper studies a new query on uncertain data, called k-selection query. Given an uncertain dataset of N objects, where each object is associated with a preference score and a p...
76
Voted
PODS
2010
ACM
15 years 4 months ago
2010
ACM
A fundamental problem in data management is to draw a sample of a large data set, for approximate query answering, selectivity estimation, and query planning. With large, streamin...