Re: is there a relationship between indexes and temporary file creation?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Seref Arikan <serefarikan(at)kurumsalteknoloji(dot)com>
Cc: PG-General Mailing List <pgsql-general(at)postgresql(dot)org>
Subject: Re: is there a relationship between indexes and temporary file creation?
Date: 2015-03-15 15:16:55
Message-ID: 25147.1426432615@sss.pgh.pa.us
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Seref Arikan <serefarikan(at)kurumsalteknoloji(dot)com> writes:
> Another idea that popped into my head is to consider table partitioning. Am
> I correct to assume that (inevitable) joins could benefit from partitions
> when sub query criteria constraints results to a particular partition?

That's too vague to answer really. My suspicion is that you'd still end
up having to modify the queries, ie hand-factoring the joins, but maybe
you wouldn't need to. You could experiment easily enough; just set up a
toy database with not much data in it and see if you get plans that don't
scan all the partitions.

regards, tom lane

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