Databases have come along way in technological advancements and there is a huge range of new approaches being researched. From relational to noSQL to newSQL to object and many more. It seems with such a varied choice both open source and licensed options, the wise architecture design decisions become ever more tricky to specific business cases even more so for big data domains. The below diagram extrapolates a map of various databases and how they fit in the grand scheme of things within the database community.
