V$LIBRARY_CACHE_MEMORY

Columns
   ___________________________
 
   LC_NAMESPACE
   LC_INUSE_MEMORY_OBJECTS
   LC_INUSE_MEMORY_SIZE
   LC_FREEABLE_MEMORY_OBJECTS
   LC_FREEABLE_MEMORY_SIZE

Related:

V$BUFFER_POOL 
V$CACHE
V$DB_OBJECT_CACHE 
V$ROWCACHE 
V$ROWCACHE_PARENT 
V$ROWCACHE_SUBORDINATE 
V$SUBCACHE