Re: Options for wide-area database?

bandar_at_gmx.net (bandar) wrote in message news:<e623b4e7.0402161352.18048051_at_posting.google.com>...

Maybe you should specified what you mean by term "distance". It is possible to deploy successfully stretch cluster using synchronous transfer to up to 40km and using asynchronous transfer up to hundreds or even thousands kilometers. In fact you can even deploy asynchronous stretch cluster on continental distance (east coast - west coast). So I do not see any real limitations here.
Real Application cluster can be deployed on distance let say up to 15 kilometers. And because you were talking about problems with latency, I can tell you that we have achieved ms latencies with gigabit capacities on thirty kilometers distance. So no big deal here.

Dusan Bolek

> 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 Tue Feb 17 2004 - 09:32:05 CST