Re: Rapidly decaying performance repopulating a large table

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "David Wilson" <david(dot)t(dot)wilson(at)gmail(dot)com>
Cc: "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: Rapidly decaying performance repopulating a large table
Date: 2008-04-22 23:33:11
Message-ID: 29034.1208907191@sss.pgh.pa.us
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"David Wilson" <david(dot)t(dot)wilson(at)gmail(dot)com> writes:
> My guess at this point is that I'm just running into index update
> times and checkpoint IO. The only thing that still seems strange is
> the highly variable nature of the COPY times- anywhere from <1.0
> seconds to >20 seconds, with an average probably around 8ish. I can
> live with that, but I'm still open to any other suggestions anyone
> has!

What have you got shared_buffers set to? If it's not enough to cover
the working set for your indexes, that might be the (other) problem.

regards, tom lane

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