| From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Michael Banck <michael(dot)banck(at)credativ(dot)de>, Anastasia Lubennikova <a(dot)lubennikova(at)postgrespro(dot)ru>, Anastasia Lubennikova <lubennikovaav(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Rahila Syed <rahilasyed(dot)90(at)gmail(dot)com> |
| Subject: | Re: Parallel Index Scans |
| Date: | 2017-03-06 13:46:15 |
| Message-ID: | CAA4eK1LSMcBV3GzJEaUqBAeP6_ZBOqzk-HSCxV=iR1b1oBjwVQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Mar 6, 2017 at 6:49 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Mon, Mar 6, 2017 at 6:33 AM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> I was going to do it after index and index-only scans and parallel
> bitmap heap scan were committed, but I've been holding off on
> committing parallel bitmap heap scan waiting for Andres to fix the
> simplehash regressions, so maybe I should just go do an update now and
> another one later once that goes in.
>
As you wish, but one point to note is that as of now parallelism for
index scans can be influenced by table level parameter
parallel_workers. It sounds slightly awkward, but if we want to keep
that way, then maybe we can update the docs to indicate the same.
Another option is to have a separate parameter for index scans.
--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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