The author of MXG Software provides a historical perspective of how and why the SAS System became the pervasive tool for managing and mining of the original data warehouse, the Performance Data Base built from SMF data. The architecture of the MXG implementation is described to show how MXG, currently 911,749 lines of SAS code in 3,011 files (members), executes under MVS, VM, UNIX, OS/2, Window...