changing existing Oracle licences on all existing systems (ECC;CRM;PI,BI) with HANNA(and use HANNA DB)

Hello

Maybe not the best section ..

But we have in mind changing existing Oracle licences on all existing systems (ECC;CRM;PI,BI) with HANNA(and use HANNA DB)..

I wander what would be pro and what cons?

Thank you a lot

Jan