[coffeemug]

That was actually one of the explicit design goals of Rethink -- pick defaults such that users never have to wonder about the safety of their data. I know the folks at Riak are also in this camp, so there are definitely NoSQL dbs that do this well.

[shin_lao]

I'm not sure Riak is a good example as it's another example of an extremely slow database.

There's also the angle that if it's to offer no performance benefit, perhaps a classic relational database will do it?

I'm curious to hear your thoughts about it.