What Is The Main Advantage Of A Clustered Index Over A Non-Clustered Index? Clustered indexes specify the physical storage order of table data (this is why each table can only have one clustered index ...

Non-clustered Columnstore Indexes are also getting some enhancements in SQL Server 2016. The most notable of these enhancements is the ability to be updated.

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.