Custom Table - Transactional Data - Design/Performance Tips

Hi,

I have a Requirement to Insert/Update (Transactional Data) 500 times a day, the Custom Table. I have chosen the size category to ' 8 ' (Expected Records 4,500,000 to 9,100,000) the maximum limit given by SAP. I am sure this table will be storing/handling huge volume of records daily. Can any one please suggest me some Design/Performance Tips for creating a Custom Table in SAP.

Appreciate Your Help!

Thanks,

Kannan.