Re: Question about behavior of deletes with REPLICA IDENTITY NOTHING

From: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
To: Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
Cc: Peter Smith <smithpb2250(at)gmail(dot)com>, James Coleman <jtc331(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Question about behavior of deletes with REPLICA IDENTITY NOTHING
Date: 2024-12-18 10:56:24
Message-ID: CAA4eK1KpbW+3eQDTN2mukUxDheeZ9D9qLsj_Ks63MpS8DiF5Ng@mail.gmail.com
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On Thu, Feb 8, 2024 at 9:57 AM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> wrote:
>
> On Thu, 2024-02-08 at 13:40 +1100, Peter Smith wrote:
> > - how to set the replica identity. If a table without a replica identity is
> > + how to set the replica identity. If a table without a replica identity
> > + (or with replica identity behavior the same as <literal>NOTHING</literal>) is
> > added to a publication that replicates <command>UPDATE</command>
> > or <command>DELETE</command> operations then
> > subsequent <command>UPDATE</command> or <command>DELETE</command>
>
> I had the impression that the root of the confusion was the perceived difference
> between "REPLICA IDENTITY NOTHING" and "no replica identity", and that change
> doesn't improve that.
>
> How about:
>
> If a table without a replica identity (explicitly set to <literal>NOTHING</literal>,
> or set to a primary key or index that doesn't exist) is added ...
>

Is it correct to say "set to a primary key or index that doesn't
exist"? Because when it is set to the primary key then it should work.

I think Peter's proposal along with Ashutosh's proposal is the simpler
approach to clarify things in this area but I am fine if others find
some other way of updating docs better.

--
With Regards,
Amit Kapila.

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