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Re: xlog location arithmetic

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Euler Taveira de Oliveira <euler(at)timbira(dot)com>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: xlog location arithmetic
Date: 2012-03-09 15:00:55
Message-ID: 28900.1331305255@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Fri, Mar 9, 2012 at 9:37 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Why would it be useful to use pg_size_pretty on xlog locations?

> The point is that it would be useful to use it on the difference
> between two xlog locations,

Um, that is exactly the claim I was questioning.  Why is that useful?

> but that is a numeric value, not int8, because of signedness issues.

See my followup --- this statement appears factually incorrect,
whatever you may feel about the usefulness issue.

			regards, tom lane

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