Re: BUG #13453: PostgreSQL 9.5dev pgbench exponential distribution bug? (when threshold is small)

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От Alvaro Herrera
Тема Re: BUG #13453: PostgreSQL 9.5dev pgbench exponential distribution bug? (when threshold is small)
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Msg-id 20150618153221.GG133018@postgresql.org
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Ответ на Re: BUG #13453: PostgreSQL 9.5dev pgbench exponential distribution bug? (when threshold is small)  (Fabien COELHO <coelho@cri.ensmp.fr>)
Ответы Re: BUG #13453: PostgreSQL 9.5dev pgbench exponential distribution bug? (when threshold is small)
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Fabien COELHO wrote:
>
> Hello,
>
> >\setrandom id 1 50000 exponential 0.0000001
> >insert into test values (:id);
>
> Yes, a very small coefficient on a truncated exponential is pretty close to
> a uniform distribution. I think that this is a mathematical fact, not a bug.

It's a fact of life also ... you don't notice exponentially-growing
stuff until it's way out of hand :-)

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

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