Re: Dataguard Exadata -> Database Appliance
- From: Freek D'Hooge <freek.dhooge@xxxxxxxxx>
- To: development@xxxxxxxxxxxxxxxxx
- Date: Tue, 15 Apr 2014 20:18:48 +0200
Hi,
For me it depends on what is expected from the DR environment.
If management is fully aware that it will only will allow to run in a
somewhat restricted way, I don't have much problem in using lesser
hardware for a DR site.
Just make sure you have a paper trail confirming their awareness ;-)
I have seen the combination exadata primary - oda standby being proposed
before, with virtualization enabled on the ODA
Reason behind is is that you can run on a minimal set of CPU's activated
on the standby site and only activate the rest when doing a failover.
As the primary site at that point no longer exists, you could argue that
you don't need additional db licenses.
(Now, that is something I would like to see confirmed in writing from
Oracle LMS ;-) )
Kind regards,
--
Freek D'Hooge
Exitas NV
Senior Oracle DBA
email: freek.dhooge@xxxxxxxxx
tel +32(03) 443 12 38
http://www.exitas.be
On di, 2014-04-15 at 19:40 +0200, Martin Bach wrote:
> Hello all,
>
> This is an interesting thread!
>
> I think an important point is missing here though. Exadata, especially
> since 11.2.3.3.0, will make very elegant choices when it comes to
> caching data in the Smart Flash Cache. You will see very decent
> response times. You will also notice that smart scans will benefit
> from intelligent caching. This works so well that I had to rewrite
> some of my demos.
>
> Those features do not exist outside the Exadata platform. Outside of
> Exadata you get no smart IO either, so when you are in the
> uncomfortable position where you actually have to invoke DR you could
> well be in trouble because your DR site does not perform adequately.
> And there is more hidden trouble like for example IORM you can't have
> outside of Exadata...
>
> Not using identical hardware for DR is a risk in my opinion. The OPs
> question is similar in concept to reusing your old production kit for
> DR. It too might work while in the standby role, but will cost likely
> not support the production workload (it is the old kit for a reason).
>
> Hope this helps,
>
> Martin
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