Big Data has become a valuable resource and mechanism for the practitioners and researchers to explore the value of data sets in all kinds of business scenarios and scentific investigations. New computing platforms such as cloud computing, mobile Internet, social network are driving the innovations of big data. From government initiative perspective, Obama Administration in United States launched "Big Data" initiative that announces $200 Million in new R&D investments on March 29, 2012. European Union also announced "Big Data at your service" on July 25, 2012. From industry perspective, IBM, SAP, Oracle, Google, Microsoft, Yahoo, and other leading software and internet service companies have also launched their own innovation initiatives around big data.