I have done POVs on HANA on ECC.
Below links should help.
1)
http://scn.sap.com/community/abap/hana/blog/2013/06/05/abap-on-hana--from-analysis-to-optimization
2)http://scn.sap.com/community/hana-in-memory/blog/2013/04/08/best-practices-for-sap-hana-data-loads
3)http://scn.sap.com/community/abap/hana/blog/2013/12/23/custom-code-and-sap-hana
In summary ,Use more ABAP procedures wherever applicable ie basically Code pushdown.
Hope this helps!.
Regards
Balwant