On Tue, Sep 10, 2019 at 12:53 AM yash mehta <yash...@gmail.com> wrote:
> 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 <mle...@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. >> > Could you put a view in between the real table and the query that does the group by ? (since you can't change the query) I'm wondering if the sort/processing time would be faster when that distinct is invoked if the rows are already distinct.
