I think it is a bit harder when the data is highly connected (social web app). However, memory is so cheap now that you could probably get away with keeping al

I think it is a bit harder when the data is highly connected (social web app). However, memory is so cheap now that you could probably get away with keeping all of your business objects in memory, having them write-through to disk for persistence. I imagine that you would have to move business objects around the servers to decrease messaging latency as the connectivity between objects changes. I don't know of any frameworks that use this approach.