Re: v11.5- v15.3 upgrade (linux)

Thanks for the reply.

When you say "dump/restore" do you mean pg_dump then running the resulting
SQL into the destination DB?
I like the replication option myself best (min downtime), especially as we
use a DB alias for connections. But I don't think I'll be able to sell
that to the IT group.

Regarding the safety of running a "drop extension plperlu cascade" on the
v11.5, would you consider that to be safe GIVEN that there are no plperlu
procs that it will affect? I need to be able to tell IT that I'm not the
only one who thinks that it's safe.

On Fri, Mar 8, 2024 at 11:28 AM Yogesh Sharma <
yogesh(dot)sharma(at)catprosystems(dot)com> wrote:

> Greetings,
>
> On 3/6/24 19:19, David Gauthier wrote:
> > Hi:
> > I'm a PG user in a big corp with an IT dept that administers a PG
> > server/instance that I use. It's an old install, v11.5, and we need
> > to upgrade to v15.3. They want to bring the upgraded DB up on a new
> > linux vm which has OS upgrades of its own. So it's a move AND an
> > upgrade. There are 2 concerns....
> >
> > First has to do with a jump from 11.5 - 15.3 ? Is it safe to do this
> > given so many major intermediate versions being skipped ?
>
> Generally speaking, it is safe from database point of view but you have
> to verify that application is working as expected with PostgreSQL 15,
> driver update, any query performance issues, any deprecate features in
> use, collation differences, and performance verification, etc.
>
> PostgreSQL supports dump/restore (slow and longer downtime), binary
> upgrade using pg_upgrade (faster and low downtime), and logical
> replication (complex and least downtime). Since OS upgrade is also part
> of the equation, dump/restore or logical are better candidates. Due to
> OS collation difference I would avoid binary upgrade path.
>
>
> --
> Kind Regards,
> Yogesh Sharma
> PostgreSQL, Linux, and Networking Expert
> Open Source Enthusiast and Advocate
> PostgreSQL Contributors Team @ RDS Open Source Databases
> Amazon Web Services: https://aws.amazon.com
>
>