[PDF.03gv] Histogram Techniques for Cost Estimation in Query Optimization: A Study in Relational Database Systems

Histogram Techniques for Cost Estimation in Query Optimization: A Study in Relational Database Systems

[PDF.io61] Histogram Techniques for Cost Estimation in Query Optimization: A Study in Relational Database Systems

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 | #3835162 in Books |  2011-08-26 | Original language:English | PDF # 1 |  8.66 x.29 x5.91l,.44 | File type: PDF | 128 pages

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||About the Author|Dr. Xiaohui Yu holds a B.Sc. from Nanjing University, China, a M.Phil. from the Chinese University of Hong Kong, and a Ph.D. from the University of Toronto, Canada. His research interests include databases, data mining, and the Web.

Query optimization is an important task of Relational Database Management Systems. A typical query optimizer estimates the cost of various execution plans for a given query, and selects the one with the lowest cost. The accuracy of cost estimation is crucial in that it directly affects the quality of the decisions made by query optimizers. Seletivity estimation is an important part of cost estimation. Many commercial DBMSs maintain histograms to summarize the conte...

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