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From: shashidhar Reddy <shashidharreddy001@gmail.com>
Date: Mon, 25 Nov 2024 14:14:37 +0530
Message-ID: <CAH=zU4tTUYCyhipNy-auv-Zum=CFiV0g1BURyFxrx7_nsv0Ucg@mail.gmail.com>
Subject: Re: Unique key constraint Issue
To: ajit wangkhem <ajit.wangkhem@gmail.com>
Cc: pgsql-general <pgsql-general@postgresql.org>
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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=E2=80=AFpm ajit wangkhem, <ajit.wangkhem@gmail.c=
om>
wrote:

>   Output should be consistent across servers below query o/p
>
> SELECT conname, pg_get_constraintdef(oid)
> FROM pg_constraint
> WHERE conrelid =3D 'your table name'::regclass AND contype =3D '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=E2=80=AFPM shashidhar Reddy <
> shashidharreddy001@gmail.com> 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 ke=
y.
>> I tried db dump and restore but the key is failing to create when restor=
e
>> with duplicate value errors.
>>
>>
>>
>>

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<div dir=3D"auto">Hi Ajit,<div dir=3D"auto"><br></div><div dir=3D"auto">Tha=
nk you=C2=A0for your reply!</div><div dir=3D"auto"><br></div><div dir=3D"au=
to">The result of the query is same across all servers and yes streaming re=
plication does not have any issue but the question is how did duplicate val=
ues entered when there unique key in place.</div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, 25 Nov, 2024, 1:21=
=E2=80=AFpm ajit wangkhem, &lt;<a href=3D"mailto:ajit.wangkhem@gmail.com">a=
jit.wangkhem@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x"><div dir=3D"ltr">=C2=A0 Output=C2=A0should be consistent across servers =
below query o/p<div><br></div><div>SELECT conname, pg_get_constraintdef(oid=
)<br>FROM pg_constraint<br>WHERE conrelid =3D &#39;your table name&#39;::re=
gclass AND contype =3D &#39;u&#39;;</div><div>(different datatype=C2=A0comb=
ine=C2=A0in UK is not an issue). This issue may not happen in asynchronous,=
 log shipping or streaming replication. In logical replication it may creat=
e problem.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Nov 25, 2024 at 12:01=E2=80=AFPM shashidhar Reddy &=
lt;<a href=3D"mailto:shashidharreddy001@gmail.com" target=3D"_blank" rel=3D=
"noreferrer">shashidharreddy001@gmail.com</a>&gt; wrote:<br></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px =
solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto"><div dir=3D"auto=
">Hello,</div><div dir=3D"auto"><br></div><div dir=3D"auto">We have postgre=
sql servers with PostgreSQL 13.10=C2=A0 =C2=A0on Ubuntu release 22.04.</div=
><div dir=3D"auto"><br></div><div dir=3D"auto">The issue is a unique key co=
nstraint with two columns one is character another is integer. At some=C2=
=A0point the unique key did=C2=A0not work as I see duplicate values with th=
ese 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.<=
/div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div dir=3D"au=
to"><br></div></div>
</blockquote></div>
</blockquote></div>

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