As a follow-up of Jan’s blog post we have extracted some central figures and created this infographic for your reference.

Frank is both entrepreneur and backend developer, developing mostly memory databases for two decades. He is the CTO and co-founder of ArangoDB. Try to challenge Frank asking him questions on C, C++ and MRuby. Besides Frank organizes Cologne’s NoSQL group & is an active member of NoSQL community.
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you may also want to compare disk space usage with RDBMS engines such as MySQL. This post compares MySQL with MongoDB when it comes to disk space requirements: http://blog.trackerbird.com/content/mysql-vs-mongodb-disk-space-usage/