Re: Add exclusive backup deprecation notes to documentation

From: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: David Steele <david(at)pgmasters(dot)net>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Martín Marqués <martin(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>
Subject: Re: Add exclusive backup deprecation notes to documentation
Date: 2019-03-29 11:58:45
Message-ID: 047a38f9-58d7-3af1-3706-a5a9e2c6e264@2ndquadrant.com
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On 2019-03-20 14:42, Magnus Hagander wrote:
> But that would be factually incorrect and backwards, so it seems like a
> terrible idea, at least when it comes to manual. If you are doing it
> manually, it's a lot *easier* to do it right with the non-exclusive
> mode, because you can easily keep one psql and one shell open. And
> that's safe.

The scenario I have in mind is, a poorly maintained server, nothing
installed, can't install anything (no internet connection, license
expired), flaky network, you fear it's going to fail soon, you need to
take a backup. The simplest procedure would appear to be: start backup
mode, copy files away, stop backup mode. Anything else that involves
holding a session open over there for the whole time is way more fragile
unless proper preparations have been made (and even then). So I don't
know what you want to call that scenario, but I would feel more
comfortable having these basic tools available in a bind.

--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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