| From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
|---|---|
| To: | Alex K <kondratov(dot)aleksey(at)gmail(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Stephen Frost <sfrost(at)snowman(dot)net>, Anastasia Lubennikova <lubennikovaAV(at)gmail(dot)com>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, David Steele <david(at)pgmasters(dot)net>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Subject: | Re: Parallel COPY FROM execution |
| Date: | 2017-06-30 13:45:49 |
| Message-ID: | CAFj8pRDxYPirwZyBSPbnC5GGVcgv3WLkjO2QMxV=uHuarcbg9w@mail.gmail.com |
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| Lists: | pgsql-hackers |
2017-06-30 15:42 GMT+02:00 Alex K <kondratov(dot)aleksey(at)gmail(dot)com>:
> On Fri, Jun 30, 2017 at 3:35 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
> wrote:
> >
> >
> > 2017-06-30 14:23 GMT+02:00 Alex K <kondratov(dot)aleksey(at)gmail(dot)com>:
> >>
> >> Thus, it results in a ~60% performance boost per each x2 multiplication
> of
> >> parallel processes, which is consistent with the initial estimation.
> >>
> >
> > the important use case is big table with lot of indexes. Did you test
> > similar case?
>
> Not yet, I will try it, thank you for a suggestion. But how much is it
> 'big table' and 'lot of indexes' in numbers approximately?
>
the size is about 1/3 RAM size, 60 columns, 30 indexes
Regards
Pavel
>
> Also, index updates and constraint checks performance are what I cannot
> control during COPY execution, so probably I have not to care too much
> about that. But of course, it is interesting, how does COPY perform in
> that case.
>
>
> Alexey
>
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