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The overwhelming flow of information in many data stream applications forces many companies to outsource to a third-party the deployment of a Data Stream Management System (DSMS) for performing desired computations. Remote computations intrinsically raise issues of trust, making query execution assurance on data streams a problem with practical implications. Towards that goal, the paper proposes a probabilistic algorithm for selection and aggregate/group-by queries, that uses constant space irrespective of the result-set size, has low update cost, and arbitrarily small probability of failure. They generalize this algorithm to allow some tolerance on the number of errors permitted (irrespective of error magnitude), and also discuss the hardness of permitting arbitrary errors of small magnitude. They also perform an empirical evaluation using live network traffic.

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Format:PDFSize:212 KB
Date:Jan 2008
Pages:10

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