| From: | daya airody <daya(dot)airody(at)gmail(dot)com> |
|---|---|
| To: | Michael Lewis <mlewis(at)entrata(dot)com> |
| Cc: | Pgsql Performance <pgsql-performance(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: JOIN on partitions is very slow |
| Date: | 2020-03-23 07:40:19 |
| Message-ID: | CAFg0VMAkUn7AJuNo28sm2zXcsJUXKm+ACD2CmZZxZ801PZSiPw@mail.gmail.com |
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| Lists: | pgsql-performance |
Yes. I can tweak the query. Version of postgres is 9.5.15. I have about 20
partitions for company_sale_account table.
I do have an index on company name.
I need to use DISTINCT as i need to remove the duplicates.
Thanks for your time.
On Sun, Mar 22, 2020 at 11:38 PM Michael Lewis <mlewis(at)entrata(dot)com> wrote:
> Are you able to tweak the query or is that generated by an ORM? What
> version of Postgres? Which configs have you changed from default? How many
> partitions do you have? Is there an index on company name?
>
> Anytime I see distinct keyword, I expect it to be a performance bottleneck
> and wonder about rewriting the query. Even just using group by can be much
> faster because of how it gets executed.
>
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