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    SIGMOD
    1996
    ACM
    97views Database» more  SIGMOD 1996»
    Bifocal Sampling for Skew-Resistant Join Size Estimation
    14 years 3 months ago
    Bifocal Sampling for Skew-Resistant Join Size Estimation
    Download  theory.stanford.edu
    This paper introduces bifocal sampling, a new technique for estimating the size of an equi-join of two relations. Bifocal sampling classi es tuples in each relation into two group...
    Sumit Ganguly, Phillip B. Gibbons, Yossi Matias, A...
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    PODS
    1999
    ACM
    121views Database» more  PODS 1999»
    Tracking Join and Self-Join Sizes in Limited Storage
    14 years 3 months ago
    Tracking Join and Self-Join Sizes in Limited Storage
    Download  theory.stanford.edu
    Query optimizers rely on fast, high-quality estimates of result sizes in order to select between various join plans. Selfjoin sizes of relations provide bounds on the join size of...
    Noga Alon, Phillip B. Gibbons, Yossi Matias, Mario...
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