407 search results - page 6 / 82 » Query Estimation by Adaptive Sampling |
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VLDB
2009
ACM
15 years 9 months ago
2009
ACM
We consider the problem of using sampling to estimate the result of an aggregation operation over a subset-based SQL query, where a subquery is correlated to an outer query by a NO...
GECCO
2004
Springer
15 years 2 months ago
2004
Springer
Abstract. The usual approach to deal with noise present in many realworld optimization problems is to take an arbitrary number of samples of the objective function and use the samp...
DMSN
2004
ACM
15 years 2 months ago
2004
ACM
A distributed data-stream architecture finds application in sensor networks for monitoring environment and activities. In such a network, large numbers of sensors deliver continu...
IOR
2006
14 years 9 months ago
2006
For a discrete-time finite-state Markov chain, we develop an adaptive importance sampling scheme to estimate the expected total cost before hitting a set of terminal states. This s...
SIGMOD
2004
ACM
15 years 9 months ago
2004
ACM
Block-level sampling is far more efficient than true uniform-random sampling over a large database, but prone to significant errors if used to create database statistics. In this ...