Re: Postgres DB Migration from 8.3 to 9.1

On Thu, Oct 11, 2012 at 07:38:07PM -0700, John R Pierce wrote:
> On 10/11/12 7:15 PM, Vishalakshi Navaneethakrishnan wrote:
> >We have our production environment database server in Postgres 8.3
> >version. we have planned to upgrade to lastest version 9.1. Dump
> >from 8.3 and restore in Postgres 9.1 takes more than 5 hours. Any
> >other quick method to upgrade from 8.3 to 9.1. We need to reduce
> >our downtime below 1 hour. Any Possibilities..?
>
>
> is it the dump or the restore taking the lions share of that time?
>
> I don't know if pg_upgrade supports 8.3, but that would be one
> approach. getting it setup to work correctly can require some
> tinkering, but once you have that sorted, you start with a base
> backup of the 8.3 file system, and pg_upgrade 'converts' it to the
> newer version. you need both runtimes setup side by side so either
> can be run as pg_upgrade will need to start the old version in order
> to dump its metadata catalogs prior to migrating the data files. if
> you put both data directories on the same file system, it can use
> hard linking to 'move' the datafiles.

Upgrading with pg_upgrade from 8.3 is going to require 9.2 to be
compiled with --disable-integer-datetimes.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ It's impossible for everything to be true. +