http://www.juliandyke.com/Diagnostics/Dumps/HEAPDUMP_ADDR.html Dumps Memory Subheaps Each heap may have one or more subheaps. These can be dumped using the command ALTER SESSION SET EVENTS

http://www.juliandyke.com/Diagnostics/Dumps/HEAPDUMP.html Memory Heaps To dump the top-level heap in a memory area ALTER SESSION SET EVENTS 'immediate trace name heapdump level level'; Leve