Re: Replication for migration

On Thu, May 14, 2009 at 10:57:26AM -0300, Martin Spinassi wrote:
> Hi list!
>
> I've to do a migration of postgresql from version 8.2 to 8.3 in one
> server. The problem I see here is, to avoid data loss (people still
> using the web site that uses postgres), I'll need to stop postgres 8.2,
> make a pg_dumpall, and then restore that information in 8.3.
> Taking some considerations, like database size, server, etc. I estimate
> that it will be at least 30 minutes of downtime, and that's pretty much
> time.
>
> I've thinking in the possibility of doing some kind of master/slave with
> both versions (I must change the default port in one of them, as
> everything must happen on a single machine), and find some useful links
> like:
>
> http://wiki.postgresql.org/wiki/Replication%2C_Clustering%
> 2C_and_Connection_Pooling
> http://momjian.us/main/writings/pgsql/replication.pdf
>
>
> I'd love to read some experiences or advices, since I haven't done it
> before. Also if you have some link o document that you think I must
> read, it'll be welcomed.
>
>
> Thanks to all.
>
>
> Mart??n
>

I used Slony replication to upgrade a database from 8.2 -> 8.3 and
it worked quite well. You will need an outage to change the master
to the 8.3 database and re-point your apps, but if scripted, that
is minimal.

Cheers,
Ken