How to make settings for array for perfomance In BO?

Dear Team,

I have few queries

(1Q)How do we make settings for array size for performance in BO? Could u please give with navigation?

(2Q)I have  universe1, and and on top of universe1, i deveoped 10 different reports, How to find 10 reports belongs to universe1?

(3Q) In webi report, I want to get serial no for product (for ex sl no: 1,2,3,4,5......N) How do i achieve this?

(4Q) Is there any mechanism to check at webi report level, that the webi data is having Loop (inappropriate data)?

Thanks in advance,

Regards

Kittu