Re: Guidance Needed for PostgreSQL Upgrade from 12 to 15

Στις 18/11/24 19:26, ο/η Ron Johnson έγραψε:
> No.   Neither rsync nor streaming replication will do version upgrades.
>
> The only ways to do version upgrade are:
> 1. pg_dump + pg_restore
> 2. pg_upgrade
> 3. Logical replication
>
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).

> On Mon, Nov 18, 2024 at 12:20 PM Motog Plus <mplus7535(at)gmail(dot)com> wrote:
>
> Thanks Ron for your suggestion.
> So for pg upgrade in streaming replication setup, rsync will be a
> better option for standby upgrade if we are using --link option or
> recreating the standby, once upgrade completes on primary? Any
> suggestions on this please.
>
> Best Regards,
> Raman
>
>
> On Mon, Nov 18, 2024, 22:41 Ron Johnson <ronljohnsonjr(at)gmail(dot)com>
> wrote:
>
> On Mon, Nov 18, 2024 at 11:08 AM Motog Plus
> <mplus7535(at)gmail(dot)com> wrote:
>
> Dear Team,
>
> We are in the process of upgrading our PostgreSQL database
> from version 12 to version 15. I would greatly appreciate
> your advice on the following:
>
> 1. Would it be recommended to use the --link option with
> the pg_upgrade command, from disk space point of view?
>
>
> Yes.
>
> Are there any potential downsides to consider?
>
>
> Very much: it's a one-way journey.  No rolling back if
> something goes wrong!
>
> 2. Do you have any suggestions or best practices for
> performing an efficient upgrade in a replication setup
> (streaming replication) for both the primary and standby
> servers?
>
>
> Streaming replication is not an upgrade method.  Logical
> replication is absolutely a valid method of upgrading PG on
> one server to PG on a different server.
> --
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>
>
> --
> Death to <Redacted>, and butter sauce.
> Don't boil me, I'm still alive.
> <Redacted> lobster!