Re: MCV lists for highly skewed distributions

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От Robert Haas
Тема Re: MCV lists for highly skewed distributions
Дата
Msg-id CA+TgmoaxBVa8UT-SSRVC+J+CpLZCZuR+my3UQ5id+bB=Y3C4GA@mail.gmail.com
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Ответ на Re: MCV lists for highly skewed distributions  (Dean Rasheed <dean.a.rasheed@gmail.com>)
Ответы Re: MCV lists for highly skewed distributions
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On Wed, Feb 7, 2018 at 10:20 AM, Dean Rasheed <dean.a.rasheed@gmail.com> wrote:
> One thing this new algorithm does do is improve the user's ability to
> get more MCVs by increasing the stats target. I'm not yet convinced
> there should be a separate knob for the RSE cutoff. For that to be
> useful, there would need to be some data distributions for which 10%
> (say) was clearly better, and some for which 20% was better. So far,
> there doesn't appear to be a massive difference between the two, and
> it's nothing that can't compensated for using the existing stats
> target knob.

Fair enough.  Do you plan to press forward with this, then, or what's
the next step?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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