Index fragmentation can be resolved by rebuilding and reorganizing SQL Server indexes regularly. The Index Rebuild operation removes fragmentation by dropping the index and creating it again, defragmenting all index levels, compacting the index pages using the Fill Factor values specified in rebuild command, or using the existing value if not specified and updating the index statistics using FULLSCAN of all the data. 

The Index Reorganize operation physically reorders leaf level pages of the index to match the logical order of the leaf nodes. The index reorganizes operation will be always performed online. Microsoft recommends fixing index fragmentation issues by rebuilding the index if the fragmentation percentage of the index exceeds 30%, where it recommends fixing the index fragmentation issue by reorganizing the index if the index fragmentation percentage exceeds 5% and less than 30%.