Re: [Patch] ALTER SYSTEM READ ONLY

From: Michael Banck <michael(dot)banck(at)credativ(dot)de>
To: tushar <tushar(dot)ahuja(at)enterprisedb(dot)com>
Cc: Amul Sul <sulamul(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [Patch] ALTER SYSTEM READ ONLY
Date: 2020-06-26 06:45:53
Message-ID: 5ef599a2.1c69fb81.f8b1d.dd8a@mx.google.com
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Hi,

On Wed, Jun 24, 2020 at 01:54:29PM +0530, tushar wrote:
> On 6/22/20 11:59 AM, Amul Sul wrote:
> > 2. Now skipping the startup checkpoint if the system is read-only mode, as
> > discussed [2].
>
> I am not able to perform pg_checksums o/p after shutting down my server in
> read only  mode .
>
> Steps -
>
> 1.initdb (./initdb -k -D data)
> 2.start the server(./pg_ctl -D data start)
> 3.connect to psql (./psql postgres)
> 4.Fire query (alter system read only;)
> 5.shutdown the server(./pg_ctl -D data stop)
> 6.pg_checksums
>
> [edb(at)tushar-ldap-docker bin]$ ./pg_checksums -D data
> pg_checksums: error: cluster must be shut down
> [edb(at)tushar-ldap-docker bin]$

What's the 'Database cluster state' from pg_controldata at this point?

Michael

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