PostgreSQL 9.6 Temporary files

From: Jimmy Augustine <jimmy(dot)augustine(at)enyx(dot)fr>
To: pgsql-admin(at)postgresql(dot)org
Subject: PostgreSQL 9.6 Temporary files
Date: 2018-02-27 13:00:44
Message-ID: CAF3uhZG8gJicoz4-wPVrcG9w=MEnNeHAJBOUpR6=j5FTSR=sZg@mail.gmail.com
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Dear Friends,

I am newbie to postgresql.
I have 162 GB on my database but when I check size of all tables, I
approximately obtain 80 GB.
I also see that I have 68GB of temporary files however I only found 2.4MB
at postgres/data/base/pgsql_tmp.

Could you tell me what are those temporary files and where are they at? Can
I delete some of them?

All values come from pgAdmin 4 and checked by my own SQL
queries(postgresql-9.6).

Best regards,
Jimmy AUGUSTINE

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