title: What's the difference between SAP HANA and Memcached, Redis and existing databases hacked to use memory instead of disk?
body: <p>There's a huge buzz in the business analytics world about the In-Memory database HANA by SAP. I'm struggling to see its real innovation compared to current open source databases. OK, it has indexing, graph support, column storage, etc... but that's not really new in my opinion. The fact that it is In-Memory is not new either, see Memcached and Redis.</p>
  
  <p>What is the big deal of HANA?</p>