Over time, Oracle has been adding more contextual information into each allocated heap memory chunk, to make it easier to see what for your heap memory is used. This instrumentation is used for private (PGA,UGA,etc) heaps too, but this article focuses only on shared pool heaps. A few examples from past are: Library cache object hash values added to allocated shared pool chunk names (2010) The above technique is used for some other allocation types too, like KKSSP^NNN allocations that are used...
