3319 search results - page 381 / 664 » Type Theoretical Databases |
GIS
2009
ACM
15 years 8 months ago
2009
ACM
In this paper we consider a novel multimedia application, in which drivers may query multimedia clips captured by smartphones mounted on other vehicles. These multimedia clips vis...
164
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DBPL
2001
Springer
15 years 8 months ago
2001
Springer
Abstract. We are interested in the theoretical foundations of the optimization of conjunctive regular path queries (CRPQs). The basic problem here is deciding query containment bot...
123
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SIGMOD
1999
ACM
15 years 8 months ago
1999
ACM
A major bottleneck in implementing sampling as a primitive relational operation is the ine ciency ofsampling the output of a query. It is not even known whether it is possible to ...
139
Voted
VLDB
1999
ACM
15 years 8 months ago
1999
ACM
We present an optimization method and algorithm designed for three objectives: physical data independence, semantic optimization, and generalized tableau minimization. The method ...
116
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SIGMOD
1996
ACM
15 years 8 months ago
1996
ACM
This paper introduces bifocal sampling, a new technique for estimating the size of an equi-join of two relations. Bifocal sampling classi es tuples in each relation into two group...