Any-one know how to eliminate PLANNED downtime with Oracle RAC?

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
Solutions Architect - Hewlett Packard
Solution Design Services for Oracle
Shared Solutions Architecture
HP Americas Solution Architecture
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