On Friday, April 2, 2021, Ron <ronljohnsonjr(at)gmail(dot)com> wrote:
>
> If multiple users are querying the same regions of the same tables, does
> each process have to read the same blocks, or can they share ("oh look,
> some other process has already read into memory some of the data blocks I
> need, so I'll just share those buffers")?
>
>
All data pages are manipulated while in the shared memory area. The size
of which is controlled by the “shared_buffers” configuration option.
David J.