Debarchan Sarkar (@debarchans) is working with Microsoft Escalation services and has written books on SQL Server BI and big data. His total tenure at Microsoft is 6 years, and he was with the SQL Server BI team before diving deep into big data and the Hadoop world. He is an SME in SQL Server Integration Services and is passionate about the present-day Microsoft self-service BI tools and data analysis, especially social-media brand sentiment analysis. Debarchan is from Calcutta, India, and is presently located in Bangalore, India, working in Microsoft's Global Technical Support Center. He owns and maintains his big data learning group on Facebook and has been a speaker at several Microsoft internal and external community events. Apart from his passion for technology, he is interested in visiting new places, listening to music, meeting new people, and learning new things because he is a firm believer that "Known is a drop; the unknown is an ocean".