NO SQL is basically a highly scalable disruptive data storage technology. The basic downsides included proprietary APIs (no standard SQL), evolving capabilities, loads of vendors, lack of skills. Here’s some information from the net… FoundationDB – has the added advantage of providing data consistency. MapR - SQL capabilities over large-scale distributed systems including Hadoop and NoSQL databases GridGain - brings in-memory capabilities to MongoDB. Achieves elastic scale and automatic transparent re-sharding Scientel - Gensonix® stores structured/unstructured data in Relational, Hierarchical, Network, and Column formats, and scales to trillions of real-time transactions. Accumulo - enable online model building and dynamic indexing to support both retrospective analysis and enrichment of streaming data. Microsoft - Windows Azure Tables offer the best of both scalability and ACID guarantees. RavenDB - a schema-less document database that offer...