Re: How does this FK constraint error happen?

On Mon, Jul 15, 2024 at 11:06 AM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
wrote:

> On 7/15/24 07:53, Ron Johnson wrote:
> > On Mon, Jul 15, 2024 at 10:35 AM Peter J. Holzer <hjp-pgsql(at)hjp(dot)at
> > <mailto:hjp-pgsql(at)hjp(dot)at>> wrote:
> > [snip]
> >
> >
> > Is it possible that some other process created an entry in
> > rel_group_user between these two queries?
> >
> > That was, in fact, the problem. At just the wrong time to impact one of
> > the child databases (TAPd), but not the other two (TAPb and TAPc).
> >
> > 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.

How is modified_on created?
>

It's updated by the application.

> > 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
> adrian(dot)klaver(at)aklaver(dot)com
>
>