Re: Concurrent VACUUM and ANALYZE

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>
Cc: "Postgres Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Concurrent VACUUM and ANALYZE
Date: 2008-07-22 02:19:21
Message-ID: 20922.1216693161@sss.pgh.pa.us
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"Jonah H. Harris" <jonah(dot)harris(at)gmail(dot)com> writes:
> The case I'm looking at is a large table which requires a lazy vacuum,
> and a zero vacuum cost delay would cause too much I/O. Yet, this
> table has enough insert/delete activity during a vacuum, that it
> requires a fairly frequent analysis to maintain proper plans. I
> patched as mentioned above and didn't run across any unexpected
> issues; the only one expected was that mentioned by Alvaro.

I don't find this a compelling argument, at least not without proof that
the various vacuum-improvement projects already on the radar screen
(DSM-driven vacuum, etc) aren't going to fix your problem.

regards, tom lane

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