I have been feeling a bit of the same insecurity regarding my purely SQL Server background. I feel the need to add more to my skills regarding the new technologies that are linked to databases.

One of the things you might consider learning is Hadoop, which SQL Server is now designed to work with.

https://www.brentozar.com/archive/2011/11/hadoop-basics-for-sql-server-dbas/

http://sqlmag.com/business-intelligence/integrating-hadoop-sql-server