Re: Add 64-bit XIDs into PostgreSQL 15

From: wenhui qiu <qiuwenhuifx(at)gmail(dot)com>
To: Peter Eisentraut <peter(at)eisentraut(dot)org>
Cc: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Aleksander Alekseev <aleksander(at)timescale(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Maxim Orlov <orlovmg(at)gmail(dot)com>, Shubham Khanna <khannashubham1197(at)gmail(dot)com>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Pavel Borisov <pashkin(dot)elfe(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Chris Travers <chris(at)orioledata(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, 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>
Subject: Re: Add 64-bit XIDs into PostgreSQL 15
Date: 2024-07-25 13:54:08
Message-ID: CAGjGUAKEF5j2_7scMkhBW0KdLif9xDbbg4EQkW6+1CtRWz-sww@mail.gmail.com
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Maybe a setting similar to max_wal_size could be better for that?
+1

Thanks

Peter Eisentraut <peter(at)eisentraut(dot)org> 于2024年7月25日周四 21:31写道：

> On 25.07.24 13:09, Heikki Linnakangas wrote:
> >> However, if there is no more disaster threshold at 2^31, what is the
> >> guidance for setting these? Or more radically, why even run
> >> transaction-count-based vacuum at all?
> >
> > To allow the CLOG to be truncated. There's no disaster anymore, but
> > without freezing, the clog will grow indefinitely.
>
> Maybe a setting similar to max_wal_size could be better for that?
>
>
>
>

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