It analyzed the largest bank holding companies in terms of total assets according to the National Information Center, a repository of financial data and institution characteristics collected by the Federal Reserve System.

FORBES: The 15 Best-Paying Big Banks

We only assessed the 20 largest bank holding companies in terms of total assets, as of December 2012, according to the National Information Center, a repository of financial data and institution characteristics collected by the Federal Reserve System.

FORBES: The Big Banks Hiring The Most Right Now

While Hadoop provides a repository for all of this data, it is also vital to have a nervous system that can reach out, often through APIs, to suck up data from anywhere, clean it up if need be, and deliver it into Hadoop or some other repository.

FORBES: Do You Suffer from the Data Not Invented Here Syndrome?

Finding threats that are expertly concealed and utilize multiple steps to take over a system, takes a three stage approach that combines aspects of machine learning and a cloud-based knowledge repository.

FORBES: Why Most Companies Are Fighting The Wrong Security Battle