V$SQL_SHARED_MEMORY

This view displays information about the cursor shared memory snapshot. Each SQL statement stored in the shared pool has one or more child objects associated with it. Each child object has a number of parts, one of which is the context heap, which holds, among other things, the query plan.

Column	Datatype	Description
SQL_TEXT	VARCHAR2(1000)	The SQL text of the shared cursor child object for which this row is displaying information
HASH_VALUE	NUMBER	The hash value of the above SQL text in the shared pool
HEAP_DESC	RAW(4)	The address of the descriptor for the context heap of the child cursor described in this row
STRUCTURE	VARCHAR2(16)	If the memory chunk described in this row was allocated using a comment of the form "X : Y", then this is the "X" part of the comment
FUNCTION	VARCHAR2(16)	Similar to the STRUCTURE column, this is the "Y" field of the comment
COMMENT	VARCHAR2(16)	The whole comment field that was supplied when this memory chunk was allocated
CHUNK_PTR	RAW(4)	The starting address of the allocated memory chunk
CHUNK_SIZE	NUMBER	The amount of memory allocated for this chunk
ALLOC_CLASS	VARCHAR2(8)	Class of memory that this chunk of memory belongs to. It will usually be either FREEABLE or PERMANENT.
CHUNK_TYPE	NUMBER	An index into a table of callback functions that tell the server how to recreate this chunk of memory should it need to be removed from the shared pool based on an LRU algorithm
SUBHEAP_DESC	RAW(4)	If the parent heap of this context heap is itself a subheap, then this is the address of the descriptor of the parent heap