WhatsApp used (or may be still they’re using) Yaws. What database they used with Yaws? I think Yaws only supported Mnesia, CouchDB, MongoDB, Redis and Riak.
- did they use one of these databases?
- Is it possible to create some compilicated system as WhatsApp using only Mnesia?
- Will a system solely based on Mnesia perform OK/better/worse than using something like Mongo or Postgres?
- Does Yaws support only the above 5 databased or does it also support MySQL or PostgreSQL ?