From: | Toomas <toomas(dot)kristin(at)gmail(dot)com> |
---|---|
To: | Олег Самойлов <splarv(at)ya(dot)ru>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Very newbie question |
Date: | 2023-10-23 15:23:33 |
Message-ID: | AC086CDE-EA2A-41E3-A5BA-9D858BE5783B@gmail.com |
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Thread: | |
Lists: | pgsql-general |
There is no reason to use index. The query has neither WHERE nor ORDER BY clause.
Toomas
> On 23. Oct 2023, at 18:13, Олег Самойлов <splarv(at)ya(dot)ru> wrote:
>
> Back pardon, but I have a very newbie question. I have a partitioned table, partitioned by primary bigint key, size of partition 10000000. I need to get the number of partition which need to archive, which has all rows are olden then 3 month. Here is query:
>
> SELECT id/10000000 as partition
> FROM delivery
> GROUP BY partition
> HAVING max(created_at) < CURRENT_DATE - '3 month'::interval;
>
> The 'id/10000000 as partition' is a number of the partition, it later will be used inside the partition name.
> The query runs long by sequence scan. Has anyone any ideas how to rewrite query so it will use any index?
>
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