Ok, we all know BO is gonna replace SAP BEx (not in near future) but HANA to wipe off the datawarehouse? This is like hardware evolution vs the datawarehousing technology. HANA 1.0 is more like the BWA but going forward, SAP's roadmap was to replace BW database with HANA, main memory cache is used to store data copy of database. But the BI application server is still to be used on top of HANA in addition to separate application server for ECC.
In-memory is going further to eliminate the need for a separate OLTP system . BI analytical capabilities are directly incorporated into the ECC system and allow all analytics to be run on operational data (ECC data). But hey, it's still a long way to go.
There is lot of articles on the web about this. But I like yours more, although i found one that’s more descriptive.
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