0 0 votes Q: Primary indexing can be sparse or dense? Q: Clustering indexing can be sparse or dense? Q: secondary indexing can be sparse or dense? Databases + – harsh yadav 453 views answer comment Share Follow Print See 1 comment 1 1 comment reply balchandar reddy san commented Jan 30, 2019 reply Follow flag Yes..all three can be dense/sparse.. But there is no need for Primary index to be dense and not logical for Secondary index to be sparse.. 1 1 replyShare Please log in or register to add a comment.