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From: Willy-Bas Loos <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: Justin <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: find replication slots that "belong" to a publication
Date: Mon, 7 Apr 2025 22:32:55 +0200
Message-ID: <CAHnozTi5e4pXo2myty8OOtLOatLwNADh1p8ThNhm3LenUQjzsw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAHnozTg9sadVff9WSFSBi=f6YhCJ0wPK3+riK441Cdqx-Jj+_g@mail.gmail.com>
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	<[email protected]>

Hi Laurenz,

Thanks for answering!
I find it very strange, because the publication is needed to make a
subscription, which makes the slot.
Thanks for looking into it and helping me understand.

Cheers!
Willy-Bas Loos


On Mon, Apr 7, 2025 at 3:31 PM Laurenz Albe <[email protected]>
wrote:

> On Mon, 2025-04-07 at 12:16 +0200, Willy-Bas Loos wrote:
> > My question is not so much about "can i drop a certain replication
> slot",
> > more about "does this publication still have any replication slots?".
> > Or, if you will: "what's the publication for this replication slot?".
> >
> > I've double checked the views that you suggested, and I found that I can
> relate
> > the WAL sender processes to replication slots through
> pg_replication_slots.active_pid .
> > I've also looked into replication origins.
> >
> > But I can't find a link to the publication. And that's what I need to
> know.
>
> I don't think that there is a connection between a publication and a
> replication slot.  That connection is only made when a subscriber connects
> and runs the START_REPLICATION command [1] and specifies the "pgoutput"
> plugin with the "publication_names" option [2].
>
> I don't think you can see that information reflected in a system view
> on the primary.  You'd have to query "pg_subscription" on the standby.
>
> Yours,
> Laurenz Albe
>
>
>  [1]:
> https://www.postgresql.org/docs/current/protocol-replication.html#PROTOCOL-REPLICATION-START-REPLICA...
>  [2]:
> https://www.postgresql.org/docs/current/protocol-logical-replication.html#PROTOCOL-LOGICAL-REPLICATI...
>


-- 
Willy-Bas Loos

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