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Re: I/O on select count(*) - Mailing list pgsql-performance

From Tom Lane
Subject Re: I/O on select count(*)
Date
Msg-id 5899.1211212429@sss.pgh.pa.us
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In response to Re: I/O on select count(*)  (Greg Smith <gsmith@gregsmith.com>)
List pgsql-performance
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Greg Smith <gsmith@gregsmith.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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