And to praise redis some more; it also comes with the sanest (async) replication support of any database. By far. It's literally a one-liner in the config file

And to praise redis some more; it also comes with the sanest (async) replication support of any database. By far. It's literally a one-liner in the config file. No bootstrap needed, maintenance free, absolutely no strings attached. 10 seconds and you're done. Which means you'll actually use it from day 1 and never worry about it. Compare that to any other database.