Re: upgrade and migrate

On Wed, 2019-12-04 at 13:48 +0900, Michael Paquier wrote:
> On Tue, Dec 03, 2019 at 10:32:22PM +0000, Julie Nishimura wrote:
> > Hello, what is the best way to migrate from PostgreSQL 8.3.11 on
> > x86_64-redhat-linux-gnu to PostgreSQL 9.6.16 on x86_64-pc-linux-gnu
> > server, with minimal downtime?
> > The caveat is the source has about 80 databases overall almost 30
> > TB. I could migrate the smallest ones (up to 1 tb) using pg_dump and
> > pg_restore, but the largest hot database is almost 17 tb, and I am
> > not sure how to approach this effort in a better and efficient way?
> 
> pg_upgrade could be one way to go here.  That's not the scale pg_dump
> would be very good at.  I would have personally avoided using pg_dump
> above 10~20GB.  Depending on the downtime you are ready to accept,
> a migration based on Slony could be something to investigate.

Right, Slony is the way to go, since pg_upgrade doesn't support 8.3.

I would upgrade to a version more recent than 9.6.

Yours,
Laurenz Albe
-- 
Cybertec | https://www.cybertec-postgresql.com