On Tue, Aug 13, 2019 at 5:59 PM rihad <rihad@mail.ru> wrote:
> [dbname] LOG: temporary file: path
> "base/pgsql_tmp/pgsql_tmp93683.257381", size 594
>
The setting 'work_mem' is within context 'user', that means it will
affect running sessione unless the session itself has already issued a
SET work_mem to xxx.
So this could be a reason why you don't seem to see any change.
Also keep in mind that work_mem work on a connection basis, so you are
going to possibly see 521MB x num_connections if all your clients are
doig the same kind of sort concurrently, which probably causes
PostgreSQL to go to disk due to memory unavailable.
Hope this helps.
Luca
