I have read lot of blogs\article on how different type of industries are using Big Data Analytic. But most of these article fails to mention 

1. What kinda data these companies used. What was the size of the data
2. What kinda of tools technologies they used to process the data
3. What was the problem they were facing and how the insight they got the data helped them to resolve the issue.
4. How they selected the tool\technology to suit their need.
5. What kinda pattern they identified from the data & what kind of patterns they were looking from the data.

I wonder if someone can provide me answer to all these questions or a link which at-least answer some of the the questions. 

It would be great if someone share how finance industry is making use of Big Data Analytic.