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  Non-uniformity Issues and Workarounds in Bounded-size Sampling

Gemulla, R., Haas, P. J., & Lehner, W. (2013). Non-uniformity Issues and Workarounds in Bounded-size Sampling. The VLDB Journal, 22(6), 753-772. doi:10.1007/s00778-013-0307-0.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1A4D-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-8A44-4
Genre: Journal Article

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 Creators:
Gemulla, Rainer1, Author              
Haas, P. J.2, Author
Lehner, W.2, Author
Affiliations:
1Databases and Information Systems, MPI for Informatics, Max Planck Society, ou_24018              
2External Organizations, ou_persistent22              

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Free keywords: Database sampling, Reservoir sampling, Bernoulli sampling, Sample maintenance
 Abstract: A variety of schemes have been proposed in the literature to speed up query processing and analytics by incrementally maintaining a bounded-size uniform sample from a dataset in the presence of a sequence of insertion, deletion, and update transactions. These algorithms vary according to whether the dataset is an ordinary set or a multiset and whether the transaction sequence consists only of insertions or can include deletions and updates. We report on subtle non-uniformity issues that we found in a number of these prior bounded-size sampling schemes, including some of our own. We provide workarounds that can avoid the non-uniformity problem; these workarounds are easy to implement and incur negligible additional cost. We also consider the impact of non-uniformity in practice and describe simple statistical tests that can help detect non-uniformity in new algorithms.

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Language(s): eng - English
 Dates: 2013-02-142013
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: Gemulla2012
Other: Local-ID: AE61AAD9E8EE81FCC1257B0B00394134-Gemulla2012
DOI: 10.1007/s00778-013-0307-0
 Degree: -

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Title: The VLDB Journal
Source Genre: Journal
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Affiliations:
Publ. Info: Berlin : Springer
Pages: - Volume / Issue: 22 (6) Sequence Number: - Start / End Page: 753 - 772 Identifier: ISSN: 1066-8888