Re: Problems with hash join over nested loop

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jim Nasby <jnasby(at)enova(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Problems with hash join over nested loop
Date: 2013-10-28 23:13:55
Message-ID: 13775.1383002035@sss.pgh.pa.us
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Jim Nasby <jnasby(at)enova(dot)com> writes:
> I've been working on trying to normalize a table that's got a bunch of text fields. Normalizing the first 4 has been a non-issue. But when I try and normalize 2 additional fields a bunch of query plans go belly-up.

Try increasing join_collapse_limit/from_collapse_limit. I'm a bit
confused by your description but I think maybe you've got more than 8
relations in the subqueries.

regards, tom lane

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