What exactly is a Livecache and how different is it from Oracle RAC?

What exactly is Livecache and how different is it from Oracle RAC since livecache is used for high availability? and should Livecahe be used only with MAXDB?

As per my knowledge this both are completly different concepts and have different use.
SAP Livecache is used in SAP SCM/APO to increase speed of processing by using main memeory
Whereas Oracle RAC is used for HA and scalability.

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