Sampling statistics in a database system
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United States of America Patent
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Aug 17, 2010
Grant Date -
Mar 25, 2004
app pub date -
Sep 25, 2002
filing date -
Sep 25, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A database system has the ability to perform sampled statistics collection, in which collection of statistics of a table is based on a sample (less than all rows of the table). The sample size is adjusted as the table is scanned in response to detecting a predetermined characteristic of the table (e.g., skewed data values are detected).
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