1672 search results - page 57 / 335 » Optimizing Monitoring Queries over Distributed Data |
SIGMOD
2003
ACM
15 years 10 months ago
2003
ACM
We discuss the design of an acquisitional query processor for data collection in sensor networks. Acquisitional issues are those that pertain to where, when, and how often data is...
VLDB
2005
ACM
15 years 3 months ago
2005
ACM
To answer user queries, a data integration system employs a set of semantic mappings between the mediated schema and the schemas of data sources. In dynamic environments sources o...
166
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SIGMOD
2008
ACM
15 years 10 months ago
2008
ACM
Sampling is a popular method of data collection when it is impossible or too costly to reach the entire population. For example, television show ratings in the United States are g...
100
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CIKM
2006
Springer
15 years 5 days ago
2006
Springer
Due to the resource limitation in the data stream environment, it has been reported that answering user queries according to the wavelet synopsis of a stream is an essential abili...
165
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ICDE
2005
IEEE
15 years 11 months ago
2005
IEEE
We consider the problem of efficiently computing the skyline against the most recent N elements in a data stream seen so far. Specifically, we study the n-of-N skyline queries; th...