I think it&#x27;s more that they&#x27;re considered and deployed at the same scale as RDBMS--obviously oracle still has a pretty strong hold on the database world: <a href="http:&#x2F;&#x2F;db-engines.com&#x2F;en&#x2F;ranking" rel="nofollow">http:&#x2F;&#x2F;db-engines.com&#x2F;en&#x2F;ranking</a>