Re: Problem with constraint unique.

On Wed, 2024-12-11 at 17:47 +0300, Марат Гасанян wrote:
> I apologies for bothering your team, before send this message we google the
> problem and was not able to find any tips about it. Our project encounter
> with quite strange situation where we found violation of unique constraint
> of primary key. We have a table that has an attribute ID as PK. The table
> name enerstorymain_task_info. Surprisingly the query 
> select id, count(*) from  enerstroymain_task_info group by 1 having count(*) > 1
> return a lot of rows. Than we rechecked PK it is ok. So we supposed that
> some how we had dropped the PK and then created duplicates and than rebuild
> the PK, but in this case PK would not rebuild. To avoid any weird settings
> I run the query from PGAdmin and DBView from different computers.
> Also I doubt that any kind problem like repeatable red could be the reason
> due to insert operation is done only a server without any complicated query.
> I mean simple INSERT INTO ….

No, dropping and re-creating the constraint cannot be the explanation,
unless the primary key constraint is NOT VALID.

With "uuid", it also cannot be a collation problem.

The best thing to get rid of this data corruption is to delete the extra
entries and then to sump and restore the data to a new database.

Check if your hardware has problems.

Yours,
Laurenz Albe