Non-uniformity issues and workarounds in bounded-size sampling

Non-uniformity issues and workarounds in bounded-size sampling 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. The VLDB Journal Springer Journals

Non-uniformity issues and workarounds in bounded-size sampling

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Springer Berlin Heidelberg
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Computer Science; Database Management
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  • Random sampling for continuous streams with arbitrary updates
    Tao, Y; Lian, X; Papadias, D; Hadjieleftheriou, M

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