Disk usage for intermediate results in join

From: Parul Lakkad <parul(dot)lakkad(at)gmail(dot)com>
To: "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Disk usage for intermediate results in join
Date: 2014-03-11 11:24:57
Message-ID: CACmw6hSNjttk2uhP7KV-OWQ3Lv2KdeB8TdOva7J1EgMtLxzzug@mail.gmail.com
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Hi,

I am trying to figure out when disk is used to store intermediate results
while performing joins in postgres.

According my findings using 'explain analyse ' only merge sort uses disk.
Can anyone please throw some more light on this?

Thanks,
Parul

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