SAP HANA has an in-memory computing
engine and access the data straightaway without any backup. To avoid the risk of losing data
in case of hardware failure or power cutoff, persistence layer comes as
a savior and stores all the data in the hard drive which is not volatile.
Persistence
layer manages logging of all the
transactions in order to provide standard backup and restore functions. ... It
offers regular savepoints, and also logging of all database transaction since
the last savepoint. The persistence layer is responsible for
the durability and atomicity of transactions.
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