[Opensymphony-oscache] groups usage for a newbie

I am not in a clustered env.

Creating multiple caches is possible but in that case I will have several copies of "child" objects in memory which is not wished for memory constraints.

Another idea I had is using a key for each "accesor" to the objet, in my case at most 2, one for the full access and another one for the parent access.
I.E. :
key = "id" for full access
key = "parent:id" for a parent access

but in that case I guess the object is also duplicated so it does not solve my memory issue.

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