This document summarizes Netflix's migration from Oracle to Cassandra. It discusses how Netflix moved its backend database from Oracle to Cassandra to gain scalability and reduce costs. The migration strategy involved dual writes to both databases, fork lifting the existing Oracle dataset, and a consistency checker. Challenges included security, denormalization, and engineering effort. Real use cases like APIs and viewing history are discussed along with lessons learned around data modeling, performance testing, and thinking of Cassandra as just storage.