Re: Any-one know how to eliminate PLANNED downtime with Oracle RAC?
- From: Carel-Jan Engel <careljan@xxxxxxxxxx>
- To: keith.fahrenfort@xxxxxx
- Date: Mon, 24 Nov 2008 18:27:38 +0100
Nor RAC, Nor Data Guard, Nor the combination of both (named MAA by
Oracle, Maximum Availability Architecture) would provide you the
solution. Despite any effort to redefine the meaning of 'Rolling
Upgrades', the Oracle RDBMS still does not support them. The fact is
that, although many people believe/think/hope otherwise, High
Availabilty is not a boxed device that you mailorder and have delivered
to your data center by FedEx. It is something that you have to engineer
carefully, taking the whole stack, and I mean the WHOLE STACK, including
the application, into account.
I have two customers running such stuff. One using it for some years,
the other started rolling out. A third is considering the approach. In
October, at MOOW (Miracle Oralce Open World) in Denmark I presented the
first preliminary version of my TAA (True Availability Architecture),
based on this approach.
Some mishap regarding my health prevented me from working on a paper
regarding TAA for the last couple of weeks. This is also why I'm so
silent here. I went through two accidents, a month after recovery from
the first, the second happened. However, this is a question I cannot let
go by. I'm not explaining the concept here and now. That takes too much
effort. The fact is that the approach, even when using SE or SE1(!!),
can provide 100% uptime, surviving Oracle major upgrades, HW
replacements, OS upgrades, OS changes, platform changes, whatever you
want.
It is not a plug in. The application design/development is involved. But
that is how it is, the famous triangle. You want high quality, you want
it fast, you want it cheap? Pick any two criteria. The other will be
violated, fiercely violated.
It will take a couple of weeks before I'm recovered enough, I'm afraid.
In the meantime, you can contact me directly, I can send you some global
descriptions.
Best regards,
Carel-Jan Engel
===
If you think education is expensive, try ignorance. (Derek Bok)
===
On Mon, 2008-11-24 at 16:25 +0000, Fahrenfort, Keith (HP Shared
Solutions Architect for Oracle) wrote:
> Hi, I'm working with a customer running a critical web site on a 10gR2
> RAC backend DB - they support hundreds of thousands of simultaneous
> connections at the "quietest" time.
>
> They have expressed a desire for NO downtime during ANY changes to
> Oracle, particularly the application of Oracle patches and Oracle
> upgrades (both minor and major), etc.
>
> Any thoughts? Who's "been there done that"?
>
> Thanks! Regards!
>
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> Keith Fahrenfort
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