Hello all,
thanks for your reply and sorry for this delay ..

@eirikur => sorry but my knowledge are basic ...how mucj traffic  / I/O performance ...
i don't know actually how to get this information but i'm search 

@sue => yes i'm agree ...no of course i can make a select top 100 for exemple but when i'm go to the production system for to search in the system
i don't know the structure of the table i need to search ...and in fact if i made a select => that's tell we need to check because something are strange ....
but next time, i will make a TOP 🙂

i'm trying to get more information and become with that