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Date: Wed, 14 Apr 2010 12:42:57 -0500
From: Kenneth Marshall <ktm@rice.edu>
To: Lewis Kapell <lkapell@setonhome.org>
Cc: pgsql-admin@postgresql.org
Subject: Re: Migrating from 8.3 to 8.4 on the same server
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References: <4BC5FB73.9@setonhome.org>
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On Wed, Apr 14, 2010 at 01:29:23PM -0400, Lewis Kapell wrote:
> In the documentation under the heading "Migration Between Releases" we 
> read:
>
> <<It is also possible to use replication methods, such as Slony, to create 
> a slave server with the updated version of PostgreSQL. The slave can be on 
> the same computer or a different computer. [...] Such a switch-over results 
> in only several seconds of downtime for an upgrade. >>
>
> In the section "Warm Standby Servers for High Availability" it says:
>
> << For testing purposes, it is possible to run both primary and standby 
> servers on the same system. >>
>
> Although this section does not use the term Point-In-Time Recovery, I 
> understand this is what it refers to.  Could the WAL/PITR method then be 
> used to upgrade from 8.3 to 8.4 on the same server and avoid having the 
> significant downtime of dump/restore?
>
> If so, I understand the two servers would have to run on different ports.  
> Are there any other issues/traps to be aware of?
>
> -- 
>
> Thank you,
>
> Lewis Kapell
> Computer Operations
> Seton Home Study School
>
I believe that the server versions must be the same in PITR so
you cannot use it to upgrade.

Cheers,
Ken