Non-clustered indexes can be numerous in SQL Server 2008 I remember from my Sybase days that SQL Server tables could support up to 255 indexes. One clustered index and 254 non-clustered indexes.

How Many Columns In A Single Table Can Have A Non-Clustered Index? Column Numbers In SQL Server, nonclustered indexes can contain up to 1023 columns each. Unique indexes can belong to either clustered ...

Non-clustered Columnstore Indexes (NCC Index) are also getting some enhancements in SQL Server 2016. The most notable of these enhancements is the ability to be updated. First offered in 2012 ...