Where we discuss the merits and use cases for Relational Data Bases, Document Storage and touch on key-value stores for time series work. Jarod discusses the reasons you should never ever use MySQL (and use postgres instead), Breandan talks to Elasticsearch and Jack dives a bit into columnar datastores.

Links for Episode 5: * The MySQL Book Breandan was talking about * Jepsen: Elasticsearch * Jepsen: Elasticsearch 1.5.0