Why use shared cache?
There is no more efficient way to increase the scalable performance of applications then the use caching to unload deeper layers.
>> Shared Cache>> Shared Cache Server>> Service Cleanup>> Timebased
Cleanup Strategy - TIMEBASED
The objects with the smallest time left in the cache will be deleted, in case all objects are used with max time, they will be deleted randomized
Cleanup Overview can be found here.