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Cited by 695

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HyperLogLog: the analysis of a near-optimal cardinality estimation algorithm

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Flajolet, Philippe, Fusy, Éric, Gandouet, Olivier, Meunier, Frédéric·2007·Discrete Mathematics & Theoretical Computer Science

Abstract

This extended abstract describes and analyses a near-optimal probabilistic algorithm, HYPERLOGLOG, dedicated to estimating the number of \emphdistinct elements (the cardinality) of very large data ensembles. Using an auxiliary memory of m units (typically, "short bytes''), HYPERLOGLOG performs a single pass over the data and produces an estimate of the cardinality such that the relative accuracy (the standard error) is typically about $1.04/\sqrt{m}$. This improves on the best previously known cardinality estimator, LOGLOG, whose accuracy can be matched by consuming only 64% of the original memory. For instance, the new algorithm makes it possible to estimate cardinalities well beyond $10^9$ with a typical accuracy of 2% while using a memory of only 1.5 kilobytes. The algorithm parallelizes optimally and adapts to the sliding window model.

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Metadata

Authors
Flajolet, P., Fusy, É., Gandouet, O., & Meunier, F.
Venue
Discrete Mathematics & Theoretical Computer Science
Published
2007-01-01
Volume
DMTCS Proceedings vol. AH,...
Issue
Proceedings
ISSN
1365-8050 (ISSN-L)
OpenAlex
W2144982963
Cited by
695
References
1
FWCI
8.61
Type
journal article
Language
en
Open access
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