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From: Laurenz Albe <[email protected]>
To: Willy-Bas Loos <[email protected]>
To: Justin <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: find replication slots that "belong" to a publication
Date: Mon, 07 Apr 2025 15:31:06 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAHnozThHzgK1KAMpxPV3r_oonFUEqfXxU3rQ7SDTEAvZRi3t_Q@mail.gmail.com>
References: <CAHnozTg9sadVff9WSFSBi=f6YhCJ0wPK3+riK441Cdqx-Jj+_g@mail.gmail.com>
	<CALL-XeNax53+uja36oX8WS4wX0-MdFJio5SJgpC59XHdC5XAag@mail.gmail.com>
	<CAHnozThHzgK1KAMpxPV3r_oonFUEqfXxU3rQ7SDTEAvZRi3t_Q@mail.gmail.com>

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...

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