Feedback-ID: i76984098:Fastmail
Message-ID: <4ff0dd59-9d7b-4a13-ad75-3627080458e1@aklaver.com>
Date: Mon, 15 Jul 2024 08:06:02 -0700
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: How does this FK constraint error happen?
To: Ron Johnson <ronljohnsonjr@gmail.com>, pgsql-general@lists.postgresql.org
References: <CANzqJaBF6mnUy1ZfBbySzSr1AfErnrMEGJaUvdSA1H9ZXkTbEw@mail.gmail.com>
 <20240715143518.3v5xdfuj27ryzuzh@hjp.at>
 <CANzqJaCZkwRon9xDOeFaTd05KZM--Eei1SAiattJXurx_8n0bQ@mail.gmail.com>
Content-Language: en-US
From: Adrian Klaver <adrian.klaver@aklaver.com>
In-Reply-To: <CANzqJaCZkwRon9xDOeFaTd05KZM--Eei1SAiattJXurx_8n0bQ@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Archived-At: <https://www.postgresql.org/message-id/4ff0dd59-9d7b-4a13-ad75-3627080458e1%40aklaver.com>
Precedence: bulk

On 7/15/24 07:53, Ron Johnson wrote:
> On Mon, Jul 15, 2024 at 10:35 AM Peter J. Holzer <hjp-pgsql@hjp.at 
> <mailto:hjp-pgsql@hjp.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?

How is modified_on created?


>      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.klaver@aklaver.com