The data in this section gives information about how delete operations affected indexes on allpages-locked tables:
Deletes Requiring Maint – reports the number of delete operations that potentially required modification to one or more indexes.
# of NC Ndx Maint – reports the number of nonclustered indexes that required maintenance as a result of delete operations.
Avg NC Ndx Maint/Op – reports the average number of nonclustered indexes per delete operation that required maintenance.
See “Deletes”.