[bob1029]

Do you also dream of loss of certain ACID semantics or crippling performance issues?

In the real world, it is extremely hard to provide all the same guarantees you get out of a single instance of <database vendor> if you turn around and spread it across the internet.

If you have super deep control over the physical & temporal environment around your system, you can cheat the rules a little bit (i.e. Google).

[speedgoose]

Yes I know that the perfect database cannot exist. I think some trade-off are possible though. Today I use postgresql with a primary and replicas, together with couchdb in the same application. They complement each other, but I think something good between is possible.