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From: shashidhar Reddy <[email protected]>
To: ajit wangkhem <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Unique key constraint Issue
Date: Mon, 25 Nov 2024 14:14:37 +0530
Message-ID: <CAH=zU4tTUYCyhipNy-auv-Zum=CFiV0g1BURyFxrx7_nsv0Ucg@mail.gmail.com> (raw)
In-Reply-To: <CAMurXp115NcKB64EsksfSMJmztS_FBm0PuAmnXu_OXgh8MVz3w@mail.gmail.com>
References: <CAH=zU4t3KRpt6uTZn_4eKkvpL_X9ACGNZ+XDxfMjnn6ovAyPVQ@mail.gmail.com>
	<CAMurXp115NcKB64EsksfSMJmztS_FBm0PuAmnXu_OXgh8MVz3w@mail.gmail.com>

Hi Ajit,

Thank you for your reply!

The result of the query is same across all servers and yes streaming
replication does not have any issue but the question is how did duplicate
values entered when there unique key in place.

On Mon, 25 Nov, 2024, 1:21 pm ajit wangkhem, <[email protected]>
wrote:

>   Output should be consistent across servers below query o/p
>
> SELECT conname, pg_get_constraintdef(oid)
> FROM pg_constraint
> WHERE conrelid = 'your table name'::regclass AND contype = 'u';
> (different datatype combine in UK is not an issue). This issue may not
> happen in asynchronous, log shipping or streaming replication. In logical
> replication it may create problem.
>
> On Mon, Nov 25, 2024 at 12:01 PM shashidhar Reddy <
> [email protected]> wrote:
>
>> Hello,
>>
>> We have postgresql servers with PostgreSQL 13.10   on Ubuntu release
>> 22.04.
>>
>> The issue is a unique key constraint with two columns one is character
>> another is integer. At some point the unique key did not work as I see
>> duplicate values with these two columns combination and it happened on
>> multiple servers on multiple databases on same table with same unique key.
>> I tried db dump and restore but the key is failing to create when restore
>> with duplicate value errors.
>>
>>
>>
>>

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