Re: Guidance Needed for PostgreSQL Upgrade from 12 to 15

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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