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From: Greg Smith <greg@2ndquadrant.com>
To: Josh Kupershmidt <schmiddy@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Chris <lists@deksai.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: stats collector suddenly causing lots of IO
Date: Fri, 16 Apr 2010 14:53:10 -0400
Message-ID: <4BC8B216.8030201@2ndquadrant.com> (raw)
In-Reply-To: <m2w4ec1cf761004161135ka272c184u2f0dd8a0c8460d5d@mail.gmail.com>
References: <20100413170105.GA29571@chris-laptop.a2hosting.com>
	<25952.1271370711@sss.pgh.pa.us>
	<z2s4ec1cf761004160739w3ac5511jd39263dd043e2da6@mail.gmail.com>
	<9738.1271431432@sss.pgh.pa.us>
	<g2t4ec1cf761004160830q5dff4315rcc0294d342999c35@mail.gmail.com>
	<10082.1271432484@sss.pgh.pa.us>
	<h2p4ec1cf761004160931r47cf4949o9a2fc14529c17ab1@mail.gmail.com>
	<11152.1271436528@sss.pgh.pa.us>
	<m2w4ec1cf761004161043yd59174a5h9fb011a16608d96d@mail.gmail.com>
	<4BC8A91D.9030709@2ndquadrant.com>
	<m2w4ec1cf761004161135ka272c184u2f0dd8a0c8460d5d@mail.gmail.com>

Josh Kupershmidt wrote:
> And it seems the only way
> to compact the pg_catalog tables is VACUUM FULL + REINDEX on 8.3 -- I
> had tried the CLUSTER on my 9.0 machine and wrongly assumed it would
> work on 8.3, too.
>   

Right; that just got implemented a couple of months ago.  See the news 
from http://www.postgresql.org/community/weeklynews/pwn20100214 for a 
summary of how the code was gyrated around to support that.  This is a 
tough situation to get out of in <9.0 because VACUUM FULL is slow and 
takes an exclusive lock on the table.  That tends to lead toward an 
unpredictable window for required downtime, which is never good.

-- 
Greg Smith  2ndQuadrant US  Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com   www.2ndQuadrant.us




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