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From: Tom Lane <tgl@sss.pgh.pa.us>
To: fche@redhat.com
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: Gauri Kanekar <meetgaurikanekar@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Replication Syatem
Date: Wed, 30 Apr 2008 11:02:39 -0400
Message-ID: <18879.1209567759@sss.pgh.pa.us> (raw)
In-Reply-To: <y0m63tzv29h.fsf@ton.toronto.redhat.com>
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	<7e4ba9550804280705q43c51e66l104a5ff9272bbd4d@mail.gmail.com>
	<20080428162243.GN2970@commandprompt.com>
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	<Pine.GSO.4.64.0804290347560.20575@westnet.com>
	<873.1209478562@sss.pgh.pa.us>
	<y0m63tzv29h.fsf@ton.toronto.redhat.com>

fche@redhat.com (Frank Ch. Eigler) writes:
> Tom Lane <tgl@sss.pgh.pa.us> writes:
>> Also, you need to make sure you have the FSM parameters set high enough
>> so that all the free space found by a VACUUM run can be remembered.

> Would it be difficult to arrange FSM parameters to be automatically
> set from the VACUUM reclaim results?

Yeah, because the problem is that FSM is kept in shared memory which
cannot be resized on-the-fly.

In retrospect, trying to keep FSM in shared memory was a spectacularly
bad idea (one for which I take full blame).  There is work afoot to
push it out to disk so that the whole problem goes away; so I don't see
much point in worrying about band-aid solutions.

			regards, tom lane

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