V$SUBCACHE

Columns
   ___________________________
 
   OWNER_NAME
   NAME
   TYPE
   HEAP_NUM
   CACHE_ID
   CACHE_CNT
   HEAP_SZ
   HEAP_ALOC
   HEAP_USED

Related:

V$CACHE
V$DB_OBJECT_CACHE 
V$LIBRARYCACHE 
V$ROWCACHE 
V$ROWCACHE_PARENT 
V$ROWCACHE_SUBORDINATE