[splatcollision]

If you're trying to store single GB documents in couch, you're doing it wrong... Unless those are binaries you can usually fragment data logically across many documents, then write custom views to aggregate however you need to.

Updates on huge docs would be painful!

[hajile]

I agree that 4GB is more than a sane person should probably be using. I don't think that going above 8MB is very hard or uncommon though. If I'm going to spread everything across many different documents and document types and then join them all together, I then have to make a case for why I'm still choosing Couch over a RDBMS.

[meddlepal]

I agree in large with your point that multi-GB documents is perhaps excessive but this does create a heck of a migration problem for a lot of users that aren't even close to 4GB.

[Volundr]

It does, but keep in mind for 3.0 this is a change to the default settings, not a hard cap. The idea is to give people lots of warning and time to do any migrations necessary prior to 4.0.