On 05/19/2011 04:33 AM, Szymon Guz wrote:
On 18 May 2011 22:22, Ireneusz Pluta <ipluta@xxxxx <mailto:ipluta@xxxxx>> wrote: W dniu 2011-05-18 13:21, Szymon Guz pisze: Hi, I've got a question about quite a strange configuration. I was asked if we can have one storage, with one data directory where one postgresql instance writes data, and many other instances read those. Is that possible without any replication and copying data? Why do they think they need that? They've got some quite nice and huge storage and it would be nice to use it from many different machines running postgreses. Another option is Oracle which can do that.
If you're thinking of Oracle RAC: be careful. Anecdotal reports I've heard suggest that a RAC cluster needs to be about 3 machines before it equals the performance of a single standalone Oracle instance on same kind of hardware. I have no personal experience with this, though, and am under the impression that the people I've heard talking about it were referring to multi-master setups. It's possible that single-master setups with read-only slaves are more efficient. It's also possible that they were just wrong. All I'm saying is that you should investigate carefully.
-- Craig Ringer -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
