| From: | Shaozhong SHI <shishaozhong(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | pgsql-general <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: parallel-processing multiple similar query tasks - any example? |
| Date: | 2022-04-28 15:54:30 |
| Message-ID: | CA+i5JwamNV4Wi0yOBpSTFW+X3KEt9LdC+qusu6brVoQUG7B0Xg@mail.gmail.com |
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| Lists: | pgsql-general |
No, No.
Why sleep(1)?
It should be all active - doing work concurrently.
Regards,
David
On Thu, 28 Apr 2022 at 16:17, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
wrote:
> On 2022-Apr-28, Shaozhong SHI wrote:
>
> > multiple similar query tasks are as follows:
> >
> > select * from a_table where country ='UK'
> > select * from a_table where country='France'
> > and so on
> >
> > How best to parallel-processing such types of multiple similar query
> tasks?
> >
> > Any example available?
>
> for country in UK France Germany Ireland; do
> echo "select pg_sleep(1); select * from a_table where country =
> '${country//\'/''/}'"
> done | \
> xargs -d"\n" -P10 -n1 psql -X -c
>
> Note the ${country/} stuff is a bash-ism.
>
> --
> Álvaro Herrera
>
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