| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>, Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz>, Jeff Davis <pgsql(at)j-davis(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Fabrízio Mello <fabriziomello(at)gmail(dot)com>, Thom Brown <thom(at)linux(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Parallel Seq Scan |
| Date: | 2015-09-09 15:09:33 |
| Message-ID: | CAA4eK1+exO1qkwu8PQYeisjXiM8yML0CjVtRuHhxMfS8dHo+xA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Sep 9, 2015 at 8:09 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>
> On Wed, Sep 9, 2015 at 2:17 AM, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>
wrote:
> > And also regarding the number of workers (16) that is shown in the
> > explain analyze plan are not actually allotted because the in my
> > configuration i set the max_worker_process as 8 only. I feel the plan
> > should show the allotted workers not the planned workers.
> > If the query execution takes time because of lack of workers and the
> > plan is showing as 16 workers, in that case user may think that
> > even with 16 workers the query is slower, but actually it is not.
>
> I would expect EXPLAIN should show the # of workers planned, and
> EXPLAIN ANALYZE should show both the planned and actual values.
>
Sounds sensible, will look into doing that way.
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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