Hi Alok,
HANA is a very fast in-memory DB from SAP, it is way faster than the traditional databases. HANA provides faster information retrieval as the data resides in the RAM and data retrieval from RAM is always faster then secondary storage.
With new implementations and new versions of SAP products the database used is HANA due to the advantage it provides. There are other vendors who have in-memory database products like SAP so in future we will see that most of the DBs are in-memory databases like HANA. It is good to think and learn HANA if you are working with database in ERP/CRM domain and especially with SAP.
Cheers,
Nagarajan Viswanathan
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