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From: Scott Ribe <[email protected]>
To: Achilleas Mantzios <[email protected]>
Cc: [email protected]
Subject: Re: Guidance Needed for PostgreSQL Upgrade from 12 to 15
Date: Mon, 18 Nov 2024 12:20:59 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CAL5GnisA0RJ=Rd5e6yw4nsCB+DtAS1=iquBKTH76MknnTsHrPg@mail.gmail.com>
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	<CAL5Gnitdyw7vCp4-0whmmJ-RC7Z9yQVx=xrtfQO6-Lxcfvqrqw@mail.gmail.com>
	<CANzqJaAL-vn0iwP8QGEcVn9RqLv9Uw12qG6fV0h5+AkwW1oGBQ@mail.gmail.com>
	<[email protected]>

> On Nov 18, 2024, at 12:10 PM, Achilleas Mantzios <[email protected]> wrote:
> 
> 
> I'd like to add if someone can tolerate some seconds of downtime, with logical replication it is possible to swap the roles of publisher / subscriber so that one can keep the old database as a means of extra safety. If his/her app breaks beyond repair and there is no time for fixing, one can simply go back to the old DB with some minor adjustments (such as sequences).

In the same vein, if one's file system offers atomic snapshots:

1) shut down PG
2) run pg_upgrade with the hard links option
3) take snapshot
4) start up new PG

Now, if there's a failure, you can go back to the snapshot and either start up the old PG, or do some troubleshooting and try upgrading again.






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