This is a great inside view about nosql in production by an Amazon guy. He compares the different nosql solutions and also mysql. One conclusion: There are big

This is a great inside view about nosql in production by an Amazon guy. He compares the different nosql solutions and also mysql. One conclusion: There are big differences in performance and reliability between out-of-the-box configurations and tuned configurations of all databases, SQL and NOSQL and that makes comparison very difficult. For example MongoDB is just tuned for speed and most users don't realize the risks they are taking when using the default configuration.