Here are links to several commercial posts on the Experience HANA Blog FYI…
The Five Minute Rule and HANA: This is a rehash of my posts here applying the famous Five Minute Rule to in-memory databases.
HANA & Exalytics: There is Barely Any Comparison: This is a rehash of my post here pointing out that Exalytics and HANA do not really compete.
HANA vs. Teradata – Part 1: This is a response to some poor thinking posted by Teradata. There is some new content that could be worth a look.
HANA vs. Teradata – Part 2: This continues the response… but it is a rehash of the post here on the rational economics of in-memory databases. Frankly, I had just reread the Teradata posts and wrote this while still annoyed… as a result it is a little flip and despite the junk posted by Teradata I might have shown them a little more respect…
Exalytics vs. Exadata: This post suggests some oddness in Oracle’s positioning of Exalytics and Exadata… maybe worth a look.