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Re: I/O on select count(*)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Smith <gsmith(at)gregsmith(dot)com>
Cc: Matthew Wakeling <matthew(at)flymine(dot)org>, pgsql-performance(at)postgresql(dot)org
Subject: Re: I/O on select count(*)
Date: 2008-05-19 15:53:49
Message-ID: 5899.1211212429@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Greg Smith <gsmith(at)gregsmith(dot)com> writes:
> The real question in my mind is why this turns into a bottleneck before 
> the similar task of cleaning the 16MB XLOG segment does.

Because we do the latter off-line, or at least try to.

			regards, tom lane

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