Is Cube Indexing required if its already BIA Indexed?

Hello All,

Apologies if my question is related to basics of BW but I was curious to know the opinion of BW experts before I jump to conclusion.

Consider we have a Cube which has 2Billion entries in total and 0.1Million records are added to this cube daily part of delta update. Do we have to still create and delete the DB index if the Cube is placed on BIA? The cube take more than an hour to recreate DB indexes and I want to know if we can remove this step from daily process chain! Is there a way to expedite the indexing as I do not see parallel processing option?

Thanks

Abhishek Shanbhogue