Various use cases are described here (especially in Oracle context): https://blogs.oracle.com/datawarehousing/entry/big_data_real_and_practical1
That blog has a few more references to current customers and what they are doing (videos).
We also did a nice VM, which has a set of products and a set of use cases embedded and you can work through things hands-on: Oracle Big Data Lite Virtual Machine
Let us know if there is more you want or if this is in the wrong direction.
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thank you. Let me check and get back to this forum incase I have more question