Hi,
On 2022-04-06 00:08:13 +0200, Gunnar "Nick" Bluth wrote:
> AFAICT, Andres' work is more about the structure (e.g.
> 13619598f1080d7923454634a2570ca1bc0f2fec). Or I've missed something...?
That was just the prep work... I'm about to send slightly further polished
version, but here's the patchset from yesterday:
https://www.postgresql.org/message-id/20220405030506.lfdhbu5zf4tzdpux%40alap3.anarazel.de
> The attached v11 incorporates the latest changes in the area, btw.
>
>
> Anyway, my (undisputed up to now!) understanding still is that only
> backends _looking_ at these stats (so, e.g., accessing the pg_stat_toast
> view) actually read the data. So, the 10-15% more space used for pg_stat
> only affect the stats collector and _some few_ backends.
It's not so simple. That stats collector constantly writes these stats out to
disk. And disk bandwidth / space is of course a shared resource.
Greetings,
Andres Freund