Re: MVCC performance issue

On Fri, Nov 12, 2010 at 9:19 AM, Ben Chobot <bench@silentmedia.com> wrote:
> On Nov 12, 2010, at 8:14 AM, Kyriacos Kyriacou wrote:
>
> We are still using PostgreSQL 8.2.4. We are running a 24x7 system and
> database size is over 200Gb so upgrade is not an easy decision!
>
> This is why we have slony, so you can slowly upgrade your 200Gb while you're
> live and then only suffer a minute or so of downtime while you switchover.
> Even if you only install slony for the point of the upgrade and then
> uninstall it after you're done, that seems well worth it to me rather than
> running on 8.2.4 for a while.
> Note there were some changes between 8.2 and 8.3 in regards to casting that
> might make you revisit your application.

I work in a slony shop and we used slony to upgrade from 8.2 to 8.3
and it was a breeze.  Course we practiced on some test machines first,
but it went really smoothly.  Our total downtime, due to necessary
testing before going live again, was less than 20 mintues.