Oracle internals, debugging and undocumented features
Well I had this post ready to publish today and did last check on google to find some additional resources and it turned out that
Tanel got this one just day before.It seems that memory is popular topic these days.
I am not going to repeat it since he covered this topic pretty good.
Here is link to Tanel’s post :
I found some of these information researching memory leak bugs.
In particulary Metalink Doc ID: 784804.1