How to prevent daily index fragmentation of 99%
I think you should try higher FILLFACTOR settings on HighScore_RoundGroup_Nidx (e.g. 50 or 40). You can set FILLFACTOR to 0 or 100 for the PRIMARY KEY because it shouldn't fragment If it still does, FILLFACTOR does not help because the reason is that newly allocated pages interleave with other newly allocated pages. This is a well-known SQL Server issue. You could move this index into its own filegroup which would stop this problem.