Selectivity estimation for query execution planning in a database
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United States of America Patent
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Jan 1, 2019
Grant Date -
Apr 21, 2016
app pub date -
Apr 23, 2015
filing date -
Oct 20, 2014
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Abstract
A computer-implemented method of estimating selectivity of a query may include generating, for data stored in a database in a memory, a one-dimensional value distribution for each of a plurality of attributes of the data. A multidimensional histogram may be generated, wherein the multidimensional histogram includes the one-dimensional value distributions for the plurality of attributes of the data. The multidimensional histogram may be converted to a one-dimensional histogram by assigning each bucket of the multidimensional histogram to corresponding buckets of the one-dimensional histogram and ordering the corresponding buckets according to a space-filling curve. One or more bucket ranges of the one-dimensional histogram may be determined by mapping the query conditions on the one-dimensional histogram. The selectivity of the query may be estimated by estimating how many data values in the one or more bucket ranges will meet the query conditions.
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Patent Owner(s)
- INTERNATIONAL BUSINESS MACHINE CORPORATION
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Gaza, Lukasz | Jankowice, PL | 28 | 195 |
Gruszecki, Artur M | Cracow, PL | 42 | 236 |
Kazalski, Tomasz | Cracow, PL | 43 | 245 |
Skibski, Konrad K | Zielonki, PL | 50 | 303 |
Stradomski, Tomasz | Bedzin, PL | 20 | 132 |
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