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From: Justin Pryzby <pryzby@telsasoft.com>
To: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
Cc: Antonin Houska <ah@cybertec.at>
Cc: Andres Freund <andres@anarazel.de>
Cc: Amit Kapila <amit.kapila16@gmail.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Srinath Reddy Sadipiralla <srinath2133@gmail.com>
Cc: Matthias van de Meent <boekewurm+postgres@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org, Robert Treat <rob@xzilla.net>
Subject: Re: Adding REPACK [concurrently]
Date: Fri, 17 Apr 2026 09:44:12 -0500
Message-ID: <aeJHPNmL4vVy3oPw@pryzbyj2023> (raw)
In-Reply-To: <CADzfLwUOnargQe+rpTC5tFUOj+yNj01qJM42PAgi2CiMpZn3tw@mail.gmail.com>
References: <9539.1775724194@localhost>
	<fpr4nsmyy3mpfrm2mijspr44dgol2cjeke5tyznb4btsznxsgx@iifdbfe2wl63>
	<CADzfLwURKVNQ++Dpi7bjoGfj-8pchDQEVex3eWBx0NCYn6TbDQ@mail.gmail.com>
	<rr2hcc5c7cm3xpbi2bniduhvq7pko4fnmykdui2wns2pvowk4n@nod4copoefzs>
	<112208.1776173876@localhost>
	<aixbxaenmbvsaarnxpagkgajv25zpc4ogo6gwv7lr7bbrh3arp@xom2lyvdgccf>
	<25514.1776264611@localhost>
	<ikqtl3utsa3er2mfz2oyjv5ofjmlxfhtkolwh5fyfotsmykhqx@rnm3d7e46tjb>
	<38385.1776277704@localhost>
	<CADzfLwUOnargQe+rpTC5tFUOj+yNj01qJM42PAgi2CiMpZn3tw@mail.gmail.com>

I had trouble testing this at first:

postgres=# REPACK (CONCURRENTLY) users;
ERROR:  42501: permission denied to use replication slots
DETAIL:  Only roles with the REPLICATION attribute may use replication slots.
CONTEXT:  REPACK decoding worker
LOCATION:  CheckSlotPermissions, slot.c:1697

That's surprising, since it was run as a superuser.

It turns out that repack runs as the owner of the table, and the table
*owner* needs to have REPLICATION -- regardless of who runs the command.

I imagine people have been testing with one user, that both owns the
table and invokes REPACK.  Maybe this just needs to be clarified in the
documentation/error message?

-- 
Justin





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