Cache server statistics show how cache is being handled in a cluster or single application server (if no cluster). Cache server statistics are tracked by cluster hit rates and storage usage.
When information is retrieved from the message store, the data is saved in the application server cache. If an application server needs the data again, the cache is queried first, resulting in less requests going back to the message store.
In a clustered environment, if the data is not present on the application server, the application server queries other application servers for the data before requesting the data from the message store.