| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Maxim Orlov <orlovmg(at)gmail(dot)com>, Thom Brown <thom(at)linux(dot)com>, Zhang Mingli <zmlpostgres(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Pavel Borisov <pashkin(dot)elfe(at)gmail(dot)com>, Aleksander Alekseev <aleksander(at)timescale(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Stephen Frost <sfrost(at)snowman(dot)net>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Ilya Anfimov <ilan(at)tzirechnoy(dot)com> |
| Subject: | Re: Add 64-bit XIDs into PostgreSQL 15 |
| Date: | 2022-11-21 20:20:33 |
| Message-ID: | 20221121202033.jlggjozlwii2cky3@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2022-11-21 15:16:46 -0500, Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > On 2022-11-21 14:21:35 -0500, Tom Lane wrote:
> >> pg_resetwal does seem like a better, more useful home for this; it'd
> >> allow you to adjust these numbers after initial creation which might be
> >> useful. I'm not sure how flexible it is right now in terms of where
> >> you can set the new values, but that can always be improved.
>
> > IIRC the respective pg_resetwal parameters are really hard to use for
> > something like this, because they don't actually create the respective
> > SLRU segments. We of course could fix that.
>
> Is that still true? We should fix it, for sure.
Sure looks that way to me. I think it might mostly work if you manage to
find nextXid, nextMulti, nextMultiOffset values that each point to the
start of a segment that'd then be created whenever those values are
used.
Greetings,
Andres Freund
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