Re: pgsql: Improve ANALYZE's strategy for finding MCVs.

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От Simon Riggs
Тема Re: pgsql: Improve ANALYZE's strategy for finding MCVs.
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Msg-id CANP8+jKpBe7_=uQkhK7V6N4ON4SLBEVjVPpMCwyFTtwoYro8ug@mail.gmail.com
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Ответ на pgsql: Improve ANALYZE's strategy for finding MCVs.  (Dean Rasheed <dean.a.rasheed@gmail.com>)
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On 22 March 2018 at 09:42, Dean Rasheed <dean.a.rasheed@gmail.com> wrote:

> Improve ANALYZE's strategy for finding MCVs.

> Thus it tends to produce
> fewer MCVs than the previous code for uniform distributions, and more
> for non-uniform distributions, reducing estimation errors in both
> cases.  In addition, the algorithm responds better to increasing the
> statistics target, allowing more values to be included in the MCV list
> when more of the table is sampled.
>
> Jeff Janes, substantially modified by me. Reviewed by John Naylor and
> Tomas Vondra.

git praise --all

-- 
Simon Riggs                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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