On Tue, Aug 13, 2019 at 5:59 PM rihad <rihad@xxxxxxx> 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
