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Your Exadata purchase includes hardware and software installation services, so as part of the delivery the machine will get set up in your data center, software installed, and an initial database created. Your work as a DBA will normally tend toward ordinary platform migration work: data transfer, testing, performance, compression, DR plans, etc.
I presented on this topic at the last Oracle OpenWorld, and slides are available at OOW13: Accelerate your Exadata deployment with the DBA skills you a... in case you're interested. I believe both Arup Nanda and Rich Niemec has introductory-level Exadata presentations that they present regularly at Oracle conferences. When looking at specific features or tasks, The Oracle team has a good collection of whitepapers as well: http://www.oracle.com/technetwork/database/exadata/
Hope this helps!
Thank you very much Marc.
This is really appreciated. My question is for our database, if I want to move forward to migrate it to exadata, do I have to change anything such as index, compression, partitions, etc.?
Do you _have_ to change anything like index, compression, partitions etc? No, you don't have to, but it may also prevent you from maximizing the benefit of Exadata features like hybrid columnar compression. As changes like indexing, partitioning, and compression typically involve large data movements anyway, a platform migration (where you're already moving all the data) can be an ideal opportunity to make these types of changes with minimal overhead.