Top level heaps/subheaps

[Sultan Syed]

Hi, I am getting little confussion how the memory is allocated for top-level heaps and subheaps in shared pool.   How can we know what are all the top-level heaps and subheaps and their hierarchy. Is it possible to get it from any X$ tables.   Freeable chunks can be flushed out?If yes ,then why there should be another type as recreatable chunks? Please explain.   Thanks in advance Syed