Hana memory usage

Hi all,

I've got problems estimating the memory size needed for our application. On the current 64G Hana the sum of sizes of all tables (as selected from m_cs_tables) is about 4G, yet the Studio shows Used/Peak memory usage as 22/45G. Where do the additional used 18G come from? Can I assume that when I increase the size of my tables to say 8G, this overhead remains constant or it will double to 36G?

Cheers,

-- Micha