What is the benefit if we add coherence in soa clustering?

Hi,
What is the benefit if we implement coherence in SOA clustering?
For eg:
Consider 2 applications like below:
1. SOA clustering with coherence implemented
2. SOA clustering without coherence implemented.
The features like high availability, load balancing, performance improvement etc., can be achieved with SOA clustering alone. But if coherence is used in SOA clustered envt, what is the value add that coherence is providing?
Your inputs are highly appreciated.
Regards,
Sree

Sree,
Coherence caching is embedded in SOA 11g. Product uses it internally for various purpose (deployment distribution, cluster communication etc.). What do you mean by SOA clustering without coherence implemented?
Regards,
Anuj

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