| From: | Juan José Santamaría Flecha <juanjo(dot)santamaria(at)gmail(dot)com> |
|---|---|
| To: | Frédéric Yhuel <frederic(dot)yhuel(at)dalibo(dot)com> |
| Cc: | Daniel Gustafsson <daniel(at)yesql(dot)se>, "Gregory Stark (as CFM)" <stark(dot)cfm(at)gmail(dot)com>, Ian Lawrence Barwick <barwick(at)gmail(dot)com>, "Imseih (AWS), Sami" <simseih(at)amazon(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Jacob Champion <jchampion(at)timescale(dot)com>, robertmhaas(at)gmail(dot)com |
| Subject: | Re: Allow parallel plan for referential integrity checks? |
| Date: | 2023-08-18 10:58:51 |
| Message-ID: | CAC+AXB2F3yV7V6pksPFTx8X24L5ijSOSu_DPKiYEVvEHmFt3SQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Aug 17, 2023 at 3:51 PM Frédéric Yhuel <frederic(dot)yhuel(at)dalibo(dot)com>
wrote:
> On 8/17/23 14:00, Frédéric Yhuel wrote:
> > On 8/17/23 09:32, Frédéric Yhuel wrote:
> >> On 8/10/23 17:06, Juan José Santamaría Flecha wrote:
> >>> Recently I restored a database from a directory format backup and
> >>> having this feature would have been quite useful
> >>
> >> Thanks for resuming work on this patch. I forgot to mention this in my
> >> original email, but the motivation was also to speed up the restore
> >> process. Parallelizing the FK checks could make a huge difference in
> >> certain cases. We should probably provide such a test case (with perf
> >> numbers), and maybe this is it what Robert asked for.
> >
> > I have attached two scripts which demonstrate the following problems:
>
Thanks for the scripts, but I think Robert's concerns come from the safety,
and not the performance, of the parallel operation.
Proving its vulnerability could be easy with a counter example, but
assuring its safety is trickier. What test would suffice to do that?
Regards,
Juan José Santamaría Flecha
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