On Tue, 14 Nov 2006, Bruce Momjian wrote:
>> My thinking on the definition of clustering was that there is some smarts for
>> graceful failover and automated or semi-automated ways of bringing failed DB
>> servers back up to date and online with the rest of the servers in the
>> cluster. All servers need to be able to accept writes, but do we
>
> No, even replication servers can have that.
>
>> differentiate on where the writes originated (i.e. middleware or another
>> postgresql server) or on functionality?
>
> Fundamentally, broadcast means the queries are being propogated outside
> the server, with the benefits and limitations inherent in that.
I'd definitely have to agree with you on that. I guess I'm trying to decide
what differentiates clustering for load balancing from query broadcast based
on your text. Maybe just don't use the word broadcast here:
"In clustering, each server can accept write requests, and these write
requests are broadcast from the original server to all other servers before
each transaction commits."
Unfortunately, I can't seem to come up with anything more clever.
--
Jeff Frost, Owner <jeff@frostconsultingllc.com>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 650-780-7908 FAX: 650-649-1954
