Your Database Is Probably Terrible | TechCrunch
Here is the nugget of wisdom from this diatribe; good article for any beginner.
It turned out that within Google, there were a whole lot of people who didn’t think too much of BigTable and its limitations. So they went and built Spanner, a relational database that doesn’t just scale, but scales across the planet. Meanwhile, FoundationDB was attacking the problem from one end, creating a datastore that is both NoSQL and ACID, while Clustrix was making a relational database that can happily and seamlessly scale horizontally as you add more servers. (As of this week they launched on Amazon Web Services, too.)