Re: select distinct runs slow on pg 10.6
yash mehta <yash215@gmail.com>
From: yash mehta <yash215@gmail.com>
To: Michael Lewis <mlewis@entrata.com>
Cc: Flo Rance <trourance@gmail.com>, Justin Pryzby <pryzby@telsasoft.com>, pgsql-performance@lists.postgresql.org
Date: 2019-09-10T04:53:01Z
Lists: pgsql-performance
Hi Michael/Justin/Flo, Thank you all for your assistance. As Michael said, looks like there are no more tricks left. On Mon, Sep 9, 2019 at 9:09 PM Michael Lewis <mlewis@entrata.com> wrote: > If you can't modify the query, then there is nothing more to be done to > optimize the execution afaik. Distinct is much slower than group by in > scenarios like this with many columns. You already identified the disk sort > and increased work mem to get it faster by 3x. There are not any other > tricks of which I am aware. >