Re: upgrade PostgreSQL 8.x on production FreeBSD

pobox@verysmall.org napisał(a):
> Could anybody point to an on-line resource about the steps involved with
> upgrading of PostgreSQL 8.x on a production FreeBSD 5.4 with minimum
> downtime (i.e. 1 - stop db so that no changes happen 2 - dump 3 -
> upgrade (ports) 4 - import 5- start db).
>

here you are:
http://www.postgresql.org/docs/8.1/static/migration.html

If both PostgreSQL versions can't coexist on one host, you can use
another one, with possibly identical setup (HW/OS/etc) for the
migration, and transfer (use tar + netcat for minimal downtime) the
cluster afterwards.