Also as far as database size, I don't believe there is a hard limit. I think you might be thinking of when MongoDB would silently corrupt databases larger than 2GB on it's 32-bit version.
As far as I remember it was a filesystem limit not couchdb limit. It was a problem that file always grow and couchdb crashed when limit exceeded. Can't find particular issue, but googling show some issues [1] that make me think that we should be very careful with db size.
[1] https://stackoverflow.com/questions/40752578/couchdb-views-c...