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Re: 8.4 open item: copy performance regression?

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Greg Smith <gsmith(at)gregsmith(dot)com>
Cc: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alan Li <ali(at)truviso(dot)com>
Subject: Re: 8.4 open item: copy performance regression?
Date: 2009-06-20 08:54:54
Message-ID: 1245488094.3895.506.camel@ebony.2ndQuadrant (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, 2009-06-19 at 22:03 -0400, Greg Smith wrote:

> This makes me wonder if in addition to the ring buffering issue, there
> isn't just plain more writing per average completed transaction in 8.4
> with this type of COPY.

I would suggest that we check how much WAL has been written. There may
be a secondary effect or a different regression hidden in these results.

-- 
 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Training, Services and Support


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