Hi Bjoern,
According to me :
So when we want to use SAP HANA do we have to migrate the whole BW System to HANA? Yes, you have to migrate whole BW system to HANA :
Or is it so that only Infocubes Methods and so on are only stored in the HANA System? No, Everything has to be migrated
You replace your existing Database with HANA.
After migration also you have to convert your DSOs to In Memory DSO and your Infocubes to INmemory Infocubes
Well if you are going to use HANA you are getting In Memory DSO and In Memory Infocube which have a slight structure change as "
You don't have Aggregates, Indexes, Dimensions( except for Package Dimension) and then there is only one fact table in In Memory Infocube
To learn more about IN Memory Infocube :
In IMDSO we don't have a physical Change Log table Instead we have a Calculation View and our Active Data Table acts as a "Temporal Table" .
Learn more about IMDSO :
http://scn.sap.com/community/hana-in-memory/blog/2012/01/05/bw-on-hana-working-of-in-memory-dso
To learn more visit cookbook BW on HANA :
https://cookbook.experiencesaphana.com/bw/
Some more blogs :
http://scn.sap.com/docs/DOC-41509
http://scn.sap.com/docs/DOC-33254
http://scn.sap.com/people/thomas.zurek/blog/2011/06/23/hana-and-bw-730--part-1
http://scn.sap.com/people/thomas.zurek/blog/2011/06/24/hana-and-bw-730--part-2
As per my knowledge :
HANA is a In memory database - whole data is stored in RAM.
Fusion-IO is not a database - it is a in memory device which can be installed and configured in the database to use it for temp files, log files, and indexes to triple performance or we can also move whole database .
But Fusion_io needs a Oracle or MySQL database to work on.
So HANA is a In Memory Database while Fusio-IO is used to accelerate database performance
There are many benefits to HANA as you get IMDSO, IN memory Infocube.
To learn more :http://www.fusionio.com/solutions/database/
Fusion-io can be used with SAP HANA also :
http://www.fusionio.com/blog/fujitsu-leverages-fusion-io-for-sap-hana-solution/