We are in early investigation around SAP HANA and trying to understand how this impacts our business processes. Have a few questions where some additional input would help.
1. What happens to existing tables in ECC. Do they get automatically migrated to Column store format as part of new Data Model or is that something that we as customer need to decide between Row and Column based storage as part of migration?
2. Current processes such as MRP and Billing leverage the ABAP processes in App server quite a bit. Post HANA, we understand the DB operations are much faster. So, what happens to current long running jobs such as billing - are they optimized for HANA or do the processes remain the same ABAP based?
3. What is the persistence layer for the data? In addition to holding the data in memory - is it persisted in disk somewhere for failover? (Kind of similar to APO livecache where the data is written to planning cubes)