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And in case you think there's a general solution to that problem, there isn't: https://en.wikipedia.org/wiki/CAP_theorem

Still, it's funny how banking seems to be the canonical example for why we need transactions given that most banking transactions are inconsistent (http://highscalability.com/blog/2013/5/1/myth-eric-brewer-on...).

Oh, in addition to my other reply I should point out that the 'C' in CAP is not the same thing as the 'C' in ACID. Be careful with that one, it can cause confusion! http://blog.thislongrun.com/2015/03/the-confusing-cap-and-ac...

Well, they're eventually consistent. It's not like it hasn't been thought through. :)

It's a useful example because it shows how there can be serious consequences for getting it wrong.