RE: High Availability -- True 7x24x365

  • From: Jeremiah Wilton <jeremiah@xxxxxxxxxxx>
  • To: Oracle-l <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 7 Jul 2005 10:54:14 -0700 (PDT)

On Thu, 7 Jul 2005 Kevin.ODonnell@xxxxxxxxxxxxxxxx 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:

Jeremiah Wilton
ORA-600 Consulting
Emergencies - Seminars - Hiring

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