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I don't see unix expanding and you can check the gardner sales values, and I don't see AS/400 expanding since it really looks antique compared to the new capabilities for these other os's, particularly around virtualization and more importantantly cost for actual performance.
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Malcom
The biggest challenge was getting Oracle Virtual Machine (OVM) stable. That took a few months and lots and lots of phone calls, emails, etc. back and forth between our infrastructure group and Oracle. But, knock on wood, it looks like we got past that hurdle.
There was also a lot of time and effort getting the Exadata tuned, grid control installed, and dataguard set up. We had a whole team set up just for that including two full-time Oracle consultants for several months. One big challenge for Oracle - they have Exadata guys, database guys, and JDE guys. But (until now), no guys that have put that all together. The heavy duty Exadata guys are used to setting up Exadata for data warehouses. Setting it up for On-line Transactional Processing (OLTP) is a whole different ballgame.
We helped Oracle break a lot of new ground so far. And as I mentioned earlier, this is just the warm-up act. This project will move 665 users from XE to 9.0. By 2013, when we are half way through, we'll have over 6000 users from two continents on it. Our current config is an overkill, but we are modeling the environment for the future.
- Gregg