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    2004
    ACM
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    CORDS: Automatic Generation of Correlation Statistics in DB2
    13 years 9 months ago
    CORDS: Automatic Generation of Correlation Statistics in DB2
    Download  www.cs.uwaterloo.ca
    When query optimizers erroneously assume that database columns are statistically independent, they can underestimate the selectivities of conjunctive predicates by orders of magni...
    Ihab F. Ilyas, Volker Markl, Peter J. Haas, Paul G...
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