Re: 10g with HACMP (no RAC)?

On Wed, 10 Sep 2008 01:45:35 +0100, Palooka <nobody_at_nowhere.com> wrote:

>facilities; it is limited in that the vendor does not support RAC,
>except in an active/passive configuration, and the vendor has openly
>stated that without major code changes, it will not scale at all with RAC.
>
>Thus the issue at hand is resilience, rather than scaleability. Agreed
>that RAC or DataGuard could offer transparent failover, but the
>application itself is another component of the stack, and requires a
>minute or two downtime in the event of failure.

Again, RAC is transparent to an application. RAC itself will not make an application unscalable. If it is unscalable using RAC, it likely doesn't scale as a normal app either. This means you need to have a scalable OLTP app, to make it work under RAC sucessfully. If the vendor doesn't support RAC, either it is not an OLTP application, or he is not telling you everything.

RAC and Dataguard are two completely different beasts. However, Dataguard will offer the protection you require at no extra cost. HACMP is not required for the protection you require, nor is HACMP required for RAC. Clusterware is a RAC component.

-- 
Sybrand Bakker
Senior Oracle DBA