Re: UUID v7

From: "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru>
To: Sergey Prokhorenko <sergeyprokhorenko(at)yahoo(dot)com(dot)au>
Cc: Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, pgsql-hackers mailing list <pgsql-hackers(at)postgresql(dot)org>, Aleksander Alekseev <aleksander(at)timescale(dot)com>, Przemysław Sztoch <przemyslaw(at)sztoch(dot)pl>, Nikolay Samokhvalov <nik(at)postgres(dot)ai>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Nick Babadzhanian <pgnickb(at)gmail(dot)com>, Mat Arye <mat(at)timescaledb(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com>, "Kyzer Davis (kydavis)" <kydavis(at)cisco(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, "brad(at)peabody(dot)io" <brad(at)peabody(dot)io>, Kirk Wolak <wolakk(at)gmail(dot)com>
Subject: Re: UUID v7
Date: 2024-01-30 09:56:10
Views: Raw Message | Whole Thread | Download mbox | Resend email
Lists: pgsql-hackers

> On 30 Jan 2024, at 12:28, Sergey Prokhorenko <sergeyprokhorenko(at)yahoo(dot)com(dot)au> wrote:
> I think this phrase is outdated: "This function can optionally accept a timestamp used instead of current time.
> This allows implementation of k-way sotable identifiers.”

> This phrase is wrong: "Both functions return a version 4 (random) UUID.”
This applies to functions gen_random_uuid() and uuidv4().
> For this phrase the reason is unclear and the phrase is most likely incorrect:
> if large batches of UUIDs are generated at the
> + same time it's possible that some UUIDs will store a time that is slightly later
> + than their actual generation time

I’ve rewritten this phrase, hope it’s more clear now.

Best regards, Andrey Borodin.

Attachment Content-Type Size
v16-0001-Implement-UUID-v7.patch application/octet-stream 16.5 KB

In response to

  • Re: UUID v7 at 2024-01-30 07:28:28 from Sergey Prokhorenko


Browse pgsql-hackers by date

  From Date Subject
Next Message John Naylor 2024-01-30 10:04:20 Re: Change GUC hashtable to use simplehash?
Previous Message Hayato Kuroda (Fujitsu) 2024-01-30 09:26:59 RE: speed up a logical replica setup