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* Transaction ID modulo
@ 2021-02-18 13:54 PG Doc comments form <noreply@postgresql.org>
0 siblings, 1 reply; 2+ messages in thread
From: PG Doc comments form @ 2021-02-18 13:54 UTC (permalink / raw)
To: pgsql-docs@lists.postgresql.org; +Cc: hemarbruno@gmail.com
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/13/routine-vacuuming.html
Description:
Hello,
transaction ID modulo is not correct.
The sentence "Normal XIDs are compared using modulo-2^32 arithmetic" should
be "Normal XIDs are compared using modulo-2^31 arithmetic"
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Transaction ID modulo
@ 2021-03-09 19:00 Bruce Momjian <bruce@momjian.us>
parent: PG Doc comments form <noreply@postgresql.org>
0 siblings, 0 replies; 2+ messages in thread
From: Bruce Momjian @ 2021-03-09 19:00 UTC (permalink / raw)
To: hemarbruno@gmail.com; pgsql-docs@lists.postgresql.org
On Thu, Feb 18, 2021 at 01:54:37PM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/13/routine-vacuuming.html
> Description:
>
> Hello,
>
> transaction ID modulo is not correct.
>
> The sentence "Normal XIDs are compared using modulo-2^32 arithmetic" should
> be "Normal XIDs are compared using modulo-2^31 arithmetic"
Uh, we use full 32-bit values that wrap around; the top bit is just
another bit to us. I think the docs are correct.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
The usefulness of a cup is in its emptiness, Bruce Lee
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