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help / color / mirror / Atom feedFrom: Adrian Klaver <[email protected]>
To: Ron Johnson <[email protected]>
To: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: How does this FK constraint error happen?
Date: Mon, 15 Jul 2024 08:37:32 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <CANzqJaC0EYvpD-452JVS4UNH8D0qFaXygBR5je=_zK2pDziM5w@mail.gmail.com>
References: <CANzqJaBF6mnUy1ZfBbySzSr1AfErnrMEGJaUvdSA1H9ZXkTbEw@mail.gmail.com>
<[email protected]>
<CANzqJaCZkwRon9xDOeFaTd05KZM--Eei1SAiattJXurx_8n0bQ@mail.gmail.com>
<[email protected]>
<CANzqJaC0EYvpD-452JVS4UNH8D0qFaXygBR5je=_zK2pDziM5w@mail.gmail.com>
On 7/15/24 08:18, Ron Johnson wrote:
> On Mon, Jul 15, 2024 at 11:06 AM Adrian Klaver
> <[email protected] <mailto:[email protected]>> wrote:
>
> On 7/15/24 07:53, Ron Johnson wrote:
> > On Mon, Jul 15, 2024 at 10:35 AM Peter J. Holzer
> > TAPd=# select * from rel_group_user
> > where user_id between 1100 and 1300
> > order by user_id;
> > user_id | group_id | modified_by | modified_on
> > ---------+----------+-------------+-------------------------
> > 1133 | 2 | 1133 | 2024-07-15 08:43:35.669
> > 1142 | 2 | 1142 | 2024-07-15 09:05:58.451
> > 1147 | 2 | 1147 | 2024-07-15 09:30:37.169
> > 1158 | 2 | 1158 | 2024-07-15 09:36:45.142
> > 1197 | 2 | 1197 | 2024-07-15 09:52:58.477
> > 1210 | 2 | 1210 | 2024-07-15 02:42:09.355
> <<<<<<<<<<<<<
>
> Time travel?
>
>
> 😞
>
>
> 2024-07-15 02:41:15 Deleting from
> FISPTAPPGS401DA/TAPd.public.access_user
> DELETE FROM public.access_user;
>
> Or do the cron jobs take that long to execute?
>
>
> The deletes from 26*3 tables (the same 26 tables in three children) took
> from 02:40:02 to 02:41:47.
> Then a bunch of COPY statements run (pg_dump from the federation master,
> then COPY to the federation children). Must be done in a specific order.
I don't think it is entirely coincidental that 1210 is the only shown
user_id with a modified_on value that is in proximity to the delete
error. My suspicion is that actions are not happening in the exact order
you think they are. I would think that combining DELETE FROM
rel_group_user; and DELETE FROM public.access_user; in a single
transaction would be a good start to fixing this.
>
> How is modified_on created?
>
>
> It's updated by the application.
At what point in the process?
>
> > 1229 | 2 | 1229 | 2024-07-15 08:33:48.443
> > 1242 | 2 | 1242 | 2024-07-15 10:29:51.176
> > 1260 | 2 | 1260 | 2024-07-15 07:36:21.182
> > 1283 | 2 | 1283 | 2024-07-15 09:48:25.214
> > 1288 | 2 | 1288 | 2024-07-15 08:10:33.609
> > (11 rows)
> >
> > TAPd=# select user_id, login_id, created_on, modified_on
> > TAPd-# from public.access_user
> > TAPd-# where user_id = 1210;
> > user_id | login_id | created_on | modified_on
> >
> ---------+------------+-------------------------+-------------------------
> > 1210 | JORIEUSER3 | 2023-10-20 11:54:24.562 | 2024-07-15
> 02:42:09.355
> > (1 row)
>
> --
> Adrian Klaver
> [email protected] <mailto:[email protected]>
>
--
Adrian Klaver
[email protected]
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