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Re: [GENERAL] A way to let Vacuum warn if FSM settings

From: Simon Riggs <simon(at)2ndquadrant(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>,Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com>,pgsql-patches(at)postgresql(dot)org
Subject: Re: [GENERAL] A way to let Vacuum warn if FSM settings
Date: 2005-03-14 08:17:48
Message-ID: 1110788268.11750.113.camel@localhost.localdomain (view raw, whole thread or download thread mbox)
Lists: pgsql-generalpgsql-patches
On Mon, 2005-03-14 at 01:40 -0500, Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Ron Mayer wrote:
> >> My reasoning why I thought the log file was more useful was
> >> that only an admin with access to the log files could really
> >> do anything about the message anyway.
> > The log file is useful, but I think showing the VACUUM user is _more_
> > useful than the log file.
> I think that reasoning is fundamentally unsound, because (a) a lot of
> people already do vacuuming via a cron job or autovacuum, and (b)
> autovacuum is definitely the wave of the future.  So it's foolish
> to design this messaging around the assumption that there will be
> a human attentive to the on-line output from VACUUM.  We should be
> ensuring that the message gets into the postmaster log --- whether
> it gets sent to the client is secondary.

Personally, I prefer the postmaster log as the place for this.

However, whilst vacuum exists as a separate command, there will be an
argument to return a message back to the person running it; we cannot
assume that people would be inattentive.

Possibly the deciding factor should be whether autovacuum makes it fully
into becoming a special backend anytime soon, since in that case only
the log would remain as an option for reporting this message, in that

Can we have both?

Best Regards, Simon Riggs

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