In HANA as secondary database scenario (side car approach) , we can improve performance of Reports that does Reads from database. In this scenario, data from Classical database is moved to HANA database through a suitable replication mechanism and reports need to be modified to read tables from HANA d/b instead of classical one.
However , if it is required to optimize OLTP transactions, which have write backs - insert/delete/update on tables, then side car scenario is not suitable. For this case, it is required to have an integrated scenario where in the Application - SAP ERP, CRM or SCM needs to have HANA as primary database , so SAP Business suite on HANA would help here .