As mentioned on the web site: "Due to a current limitation in the Erlang/OTP filesystem driver a CouchDB database file can not grow beyond 2 gigabytes in size.

As mentioned on the web site: "Due to a current limitation in the Erlang/OTP filesystem driver a CouchDB database file can not grow beyond 2 gigabytes in size. This is not a limitation in CouchDB itself, but in the standard library it uses. This problem will be addressed in a future release." This seems like a serious hurdle for major adoption.