> by the time you hit the point where you need a NoSQL solution to handle scaling issues See, people keep saying that NoSQL databases give you a performance bo

> by the time you hit the point where you need a NoSQL solution to handle scaling issues See, people keep saying that NoSQL databases give you a performance boost over traditional relational solutions (MySQL and Postgres), but exactly where does this performance boost come from? I can understand the appeal of in-memory databases or using caching (Memcached) to supplement the relational solution, but it seems like the vast majority of Mongo's performance benefits come from eschewing ACID guarantees rather than document databases being inherently faster.