Re: Options for wide-area database?

Daniel Morgan <damorgan_at_x.washington.edu> wrote in message news:<1076867390.729071_at_yasure>...
> hrishy wrote:
>
> > Hi ernest
> >
> > RAC is not for wide area.Performance would degrade after some
> > meters..I dont remembber the exact mesaure though.
>
> Please explain what you mean.

RAC over Wide Area Network requires block-based replication utilizing your Storage Technology. I NEVER saw blockbased storage replication over distances working at a satisfying degree. Storage companies advertise FibreChannel over IP ... will believe that when I see it.

I used to work for a hardware manufacturer 3 years ago. All the technical people doing implementation went crazy when another sales guy sold a "Metro Cluster" (in fact RAC would need a hardware cluster as a basis) because it's not working (network latency)

Consider using data guard but also consider third party products as data guard is not perfect either. If the database is not to big use Shareplex (heavy I/O as far as I know, usually not perfect with complex SAP environments) or think about other alternatives. A product called DBShadow is handling it pretty well, too.

... my opinion. Received on Mon Feb 16 2004 - 15:52:33 CST