Why we need live cache along with RDB in APO

Hello Expert,
I recently entered to APO module so want to know about live cache and why we really need comparing to RDB and what RDB cannot do that live cache can do?

SRS,
Functionalities are pretty much the same.  LiveCache is a relational Database, built on MaxDB.
Advantage of LC is that most of the data is stored in memory rather than on disk storage.  Data access and retrieval is substantially faster from memory than from disk storage.
Best Regards,
DB49

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