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SQL table reducing skewness

TP_CM · 2021-01-21 21:07:26

My understanding for reducing the skew of a table is to ensure the primary index is made up of columns which create a unique reference in the table. Firstly, what's an acceptable skew? I have 3 columns in my primary index, which create a unique reference for the table, and the skew is 0.80. Is it possible to reach a skew…

21-01-2021 10:07PM

#1

TP_CM

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My understanding for reducing the skew of a table is to ensure the primary index is made up of columns which create a unique reference in the table.

Firstly, what's an acceptable skew? I have 3 columns in my primary index, which create a unique reference for the table, and the skew is 0.80. Is it possible to reach a skew of 0.00?

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#2 22-01-2021 03:53PM

28064212

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"Skewness" is a measurement of the data. Asking how to reduce the skew of a table is like asking how to reduce the average value - you can't do it without changing the data. You can write queries and create indexes/statistics to mitigate the effect of skewness, but you can't change it.

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