0 votes 0 votes Databases databases indexing + – Abhishek Kumar Singh asked Dec 23, 2017 Abhishek Kumar Singh 473 views answer comment Share Follow See all 5 Comments See all 5 5 Comments reply Show 2 previous comments Shubhanshu commented Dec 23, 2017 reply Follow Share Becuase it is mentioned in the question "sparse index". 0 votes 0 votes hsd31196 commented Dec 31, 2017 reply Follow Share But primary index or cluster index is also sparse then why multilevel used ? 0 votes 0 votes Shubhanshu commented Dec 31, 2017 reply Follow Share @hsd31196 The very first level (which is near to DB table is the sparse index as per question says) and then we used the general implementation. 0 votes 0 votes Please log in or register to add a comment.