Couchbase and MongoDB are both excellent databases and have their place. I work with a MongoDB implementation that has over 12.75 billion records, adds over a billion records per year, and runs in a high availability, high read environment.
<a href="http://jaihirsch.github.io/straw-in-a-haystack//mongodb/2014/01/06/mongodb-legacy-migration/" rel="nofollow">http://jaihirsch.github.io/straw-in-a-haystack//mongodb/2014...</a><p>Know your problem domain, do your research, benchmark, test multiple solutions, and don’t be afraid to reengineer. That is how you scale.