When the number of data elements gets large - thousands to billions or more data points - standard visual representations and interaction techniques break down. In this talk, we will survey methods for scaling interactive visualizations to data sets too large to process or explore using traditional means. I will compare data reduction techniques such as sampling, aggregation and model fitting, as well as interesting hybrid approaches, and discuss their trade-offs. I will also describe methods to enable real-time interactive exploration within standards-compliant web browsers. Attendees will learn effective visualization techniques and interaction methods that are applicable to billion+ element databases.