aleksandar.ivanovski (10/7/2013)
If there is no single column index per key it will last long right?
It could, yes.
My question was, if there is no way to insert/update/delete rows in some of these columns and should I leave these without index on them?
Maybe. Test and see. As I said earlier, there are very few rules that are set in stone for indexes.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability