Motivation Very large volumes of data being collected Driven by growth of web,social media,and more recently internet-of- things Web logs were an early source of data Analytics on web logs has great value for advertisements,web site structuring,what posts to show to a user,etc ■ Big Data:differentiated from data handled by earlier generation databases Volume:much larger amounts of data stored Velocity:much higher rates of insertions Variety:many types of data,beyond relational data Database System Concepts-7th Edition 10.2 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 10.2 ©Silberschatz, Korth and Sudarshan th Edition Motivation ▪ Very large volumes of data being collected • Driven by growth of web, social media, and more recently internet-of￾things • Web logs were an early source of data ▪ Analytics on web logs has great value for advertisements, web site structuring, what posts to show to a user, etc ▪ Big Data: differentiated from data handled by earlier generation databases • Volume: much larger amounts of data stored • Velocity: much higher rates of insertions • Variety: many types of data, beyond relational data