Re: Why does this query write to the disk?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Scott Carey" <scott(at)richrelevance(dot)com>
Cc: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>, "Nikolas Everett" <nik9000(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Why does this query write to the disk?
Date: 2008-09-18 18:58:25
Message-ID: 24980.1221764305@sss.pgh.pa.us
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"Scott Carey" <scott(at)richrelevance(dot)com> writes:
> Under what conditions does EXPLAIN ANALYZE report spilling work_mem to
> disk?

For hash joins, it doesn't. You might be thinking of the additional
reporting we added for sorts recently; but there's no comparable
logging for hash ...

regards, tom lane

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