Cisco migrated a mission-critical application from an RDBMS to MongoDB, achieving a 5x improvement in performance and zero downtime upgrades and deployments. The company built a parallel configuration of the application that used MongoDB, live-synchronized data into MongoDB, and tested the system for IO and performance, tuning document models and indices as needed. This resulted in a significant reduction in code lines, from around 120,000 to fewer than 1/10th that amount, while maintaining the overall eCommerce platform architecture unchanged.