| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Chris Travers <chris(at)orioledata(dot)com>, Aleksander Alekseev <aleksander(at)timescale(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Chris Travers <chris(dot)travers(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, Fedor Sigaev <teodor(at)sigaev(dot)ru>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Konstantin Knizhnik <knizhnik(at)garret(dot)ru>, Nikita Glukhov <n(dot)gluhov(at)postgrespro(dot)ru>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, Maxim Orlov <orlovmg(at)gmail(dot)com>, Pavel Borisov <pashkin(dot)elfe(at)gmail(dot)com>, Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com> |
| Subject: | Re: Add 64-bit XIDs into PostgreSQL 15 |
| Date: | 2022-11-29 16:57:40 |
| Message-ID: | Y4Y6BNwywQIW+eSH@momjian.us |
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| Lists: | pgsql-hackers |
On Tue, Nov 29, 2022 at 11:41:07AM -0500, Robert Haas wrote:
> My argument is that removing xidStopLimit is totally fine, because it
> only serves to stop the database. What to do about xidWarnLimit is a
> slightly more complex question. Certainly it can't be left untouched,
> because warning that we're about to shut down the database for lack of
> allocatable XIDs is not sensible if there is no such lack and we
> aren't going to shut it down. But I'm also not sure if the model is
> right. Doing nothing for a long time and then warning in every
> transaction when some threshold is crossed is an extreme behavior
> change. Right now that's somewhat justified because we're about to hit
> a brick wall at full speed, but if we remove the brick wall and
> replace it with a gentle pelting with rotten eggs, it's unclear that a
> similarly strenuous reaction is the right model. But that's also not
> to say that we should do nothing at all.
Yeah, we would probably need to warn on every 1 million transactions or
something.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
Embrace your flaws. They make you human, rather than perfect,
which you will never be.
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