RE: High Availability -- True 7x24x365

From: Jeremiah Wilton <jeremiah_at_ora-600.net>
Date: Thu, 7 Jul 2005 10:54:14 -0700 (PDT)
Message-ID: <Pine.LNX.4.60.0507071047170.6359@cpq7598>

On Thu, 7 Jul 2005 Kevin.ODonnell_at_neighborcare.com wrote:

> 10g RAC is nice for a 247 solution, but you still will need to use
> some type of replication (dataguard) for patching and updates.

Wait, isn't RAC Oracle's low availability solution?

No matter what Oracle says, RAC is not for high availability. In the majority of sites, you can document lower availability numbers after RAC (due to increased levels of complexity and less-tested codepaths) as opposed to the previous single-instance system. RAC is for scaling. If you want HA, you need to engineer it. No out-of-the-box technology provides that.

I wrote a paper on HA that was good enough for someone to plagiarize in their book. Feel free to have a look:

http://www.ora-600.net/articles/stayinalive.pdf

--
Jeremiah Wilton
ORA-600 Consulting
Emergencies - Seminars - Hiring
http://www.ora-600.net
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Received on Thu Jul 07 2005 - 12:56:20 CDT