The principles of Big Data are the key to advanced security intelligence. The many information security professionals who successfully monitor enterprise security in real time realize that Big Data requirements are nothing new to security information and event management (SIEM) technology. Given their frequent claims about SIEM's limitations in scalability and analytics, newcomers to the Big Data phenomenon are evidently unaware of this fact and lack hands-on experience with true enterprise SIEMs. This white paper discusses the key tenets of Big Data.