From: Tom Lane <tgl@sss.pgh.pa.us>
To: dev@kbsolutions.ch
Cc: pgsql-sql@postgresql.org
Subject: Re: update from select
Date: Mon, 29 Oct 2007 14:42:57 -0400
Message-ID: <14485.1193683377@sss.pgh.pa.us> (raw)
In-Reply-To: <0f0501c81a40$538ce1b0$1601a8c0@kbsc1>
References: <0d5e01c81a0c$b0f67250$1601a8c0@kbsc1>
<20071029104529.GB16653@a-kretschmer.de>
<0f0501c81a40$538ce1b0$1601a8c0@kbsc1>
<dev@kbsolutions.ch> writes:
> Hash Join (cost=10827.45..25950.05 rows=4906 width=1191) (actual
> time=586.251..2852.691 rows=111306 loops=1)
> ...
> Total runtime: 633548.404 ms
So you're worried about the wrong thing entirely. The query is taking
less than 3 seconds, which may be reasonable considering it's producing
111000 join rows. The big problem is the other 630 seconds, which is
evidently update overhead. I'm wondering if you have any triggers or
foreign keys leading to or from this table.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, dev@kbsolutions.ch
Subject: Re: update from select
In-Reply-To: <14485.1193683377@sss.pgh.pa.us>
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