| From: | Rui DeSousa <rui(at)crazybean(dot)net> |
|---|---|
| To: | Kurt Roeckx <kurt(at)roeckx(dot)be> |
| Cc: | pgsql-admin(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Append only tables |
| Date: | 2020-03-21 05:44:47 |
| Message-ID: | 7CBBAB2A-A8C4-47D6-9912-7B3AD6554EAF@crazybean.net |
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| Thread: | |
| Lists: | pgsql-admin |
> On Mar 20, 2020, at 5:50 PM, Kurt Roeckx <kurt(at)roeckx(dot)be> wrote:
>
> Hi,
>
> I have a few tables that are append only. Thre are only gets insert
> and select queries, never update or delete.
>
> What I see is that every file is still being updated. It's
> currently about 500 GB big, and every of that almost 500 files has
> been touched the past 24 hours.
>
> (auto) vacuum is not happening on the table.
>
Vacuum is still required as the tuples need to be frozen. Have you vacuumed the table?
It could be the result of records being frozen during selects statements; select can freeze tuples that meet the criteria for being frozen.
I would recommend vacuuming the table to get the existing records frozen; then I believe you should see fewer updates to the all the base files.
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