From: | Luca Ferrari <fluca1978(at)gmail(dot)com> |
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To: | rihad <rihad(at)mail(dot)ru> |
Cc: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, pgsql-general General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Changing work_mem |
Date: | 2019-08-13 16:22:05 |
Message-ID: | CAKoxK+6ptxsmNegLmwBEDfBNvEAExDzrd8fthp6T5GwgMoggfw@mail.gmail.com |
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Lists: | pgsql-general |
On Tue, Aug 13, 2019 at 5:59 PM rihad <rihad(at)mail(dot)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
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