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From: vignesh C <[email protected]>
To: Peter Smith <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: DOCS - clarify CREATE SUBSCRIPTION only synchronizes sequences when copy_data=true
Date: Thu, 25 Jun 2026 12:07:30 +0530
Message-ID: <CALDaNm1xY_Js5-jppiBzGq2HMqzCHk+LLpupfWp_cFcG=vJXmg@mail.gmail.com> (raw)
In-Reply-To: <CAHut+PsrVntfrJ8gV45+6=1bs5dTWD5mU7Q6aKrBnf1vmyZQkQ@mail.gmail.com>
References: <CAHut+PsrVntfrJ8gV45+6=1bs5dTWD5mU7Q6aKrBnf1vmyZQkQ@mail.gmail.com>

On Thu, 25 Jun 2026 at 06:22, Peter Smith <[email protected]> wrote:
>
> While reviewing another patch I referred to the information of "29.7.
> Replicating Sequences #" [1] which says:
> "use CREATE SUBSCRIPTION to initially synchronize the published sequences."
>
> AFAIK, that is not entirely correct -- synchronisation of sequences
> happens only when the "copy_data" option is true. Although copy_data
> default is true, the original text was misleading. Anyway, it misled
> me.
>
> PSA a patch to clarify that "copy_data = true" is needed.

Let's include this to avoid confusion.

Few comments:
1) There should be a space after </link>:
+      use <link linkend="sql-createsubscription-params-with-copy-data">
+      <command>CREATE SUBSCRIPTION ... WITH (copy_data = true)</command>
+      </link>to initially synchronize the published sequences.

2) copy_data = true is the default, so it may mislead users into
thinking they must explicitly specify it. How about changing it to:
use CREATE SUBSCRIPTION with the default copy_data = true behavior to
initially synchronize the published sequences.

Regards,
Vignesh

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