https://msdn.microsoft.com/library/hh781257.aspx
https://github.com/aws-quickstart/quickstart-microsoft-sql
https://social.technet.microsoft.com/wiki/contents/articles/36143.sql-server-2016-step-by-step-creating-alwayson-availability-group.aspx
https://aws.amazon.com/blogs/database/how-to-architect-a-hybrid-microsoft-sql-server-solution-using-distributed-availability-groups/
