Did you hear about the latest trend in databases? If not then you should read this article about NoSQL or "not only SQL".
NoSQL vary from your classic relational database management system (RDBMS) as they do not use SQL as their primary query language. These data stores may not require fixed table schemas, usually do not support join operations, may not give full ACID (atomicity, consistency, isolation, durability) guarantees, and typically scale horizontally. NoSQL is now used by major internet companies like Google, Facebook, Twitter and others.
Here's an article about NoSQL which will help you understand the pros & cons of using the technology. Click here.