Leo Zheng has written 2 articles for SitePoint.
Non-relational Databases and Supporting Mixed Workloads
For data architectures to support mixed workloads, let’s compare implementation with two popular non-relational operational databases
Cloud Data Strategies: Preventing Data Black Holes in the Cloud
Why are we going on about black holes, gravitational effects, and points of no return? Because something analogous is happening right now in computing.