Relational database ideas emerged in the 1970s and for decades represented the dominant management system paradigm. More recently, the NoSQL movement has emerged, with types including columnar, key-value, and document stores. Amazon’s AWS-hosted DynamoDB is top-20 database management system of growing importance used by many firms. Despite the excitement around DynamoDB, there are still times when a well-designed relational database sitting in a mature DBMS like PostgreSQL will outperform DynamoDB in a number of important metrics, including cost. In this talk, Mr. Taylor will describe direct experiences with enterprise-scale deployments of DynamoDB, as well as exploring some of the issues that may not be understood before starting a new DynamoDB project.