SQL Server has a long list of roles for server, database, and applications that outline things like permissions, data selection and modification, and disk management. Examine how roles play a part ...

Understanding Columnstore Indexes in SQL Server First introduced in SQL Server 2012, columnstore indexes can give you major performance gains -- provided you have the right workloads.

That is not the case. What the NOLOCK hint does is enforce SQL Server's Read Uncommitted isolation level, which allows for what is known as dirty reads. What does this mean for your application?