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Re: Heavy write activity on first vacuum of fresh TOASTdata

From: Simon Riggs <simon(at)2ndquadrant(dot)com>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Heavy write activity on first vacuum of fresh TOASTdata
Date: 2007-12-13 16:11:23
Message-ID: 1197562283.4255.1829.camel@ebony.site (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, 2007-12-13 at 09:46 -0600, Kevin Grittner wrote:
 
> The data was inserted through a Java program using a prepared
> statement with no indexes on the table.  The primary key was then
> added, and now I've started a vacuum.  The new table wound up being
> the first big table vacuumed, and I noticed something odd.  Even
> though there have been no rollbacks, updates, or deletes on this
> table, the vacuum is writing as much as it is reading while dealing
> with the TOAST data.

Writing hint bits. Annoying isn't it? :-(

-- 
  Simon Riggs
  2ndQuadrant  http://www.2ndQuadrant.com


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