V$SUBCACHE displays information about the subordinate caches currently loaded into library cache memory. The view walks through the library cache, printing out a row for each loaded subordinate cache per library cache object.
Owner of the object containing these cache entries
Heap number containing this subordinate cache
Subordinate cache ID
Number of entries for this cache in this object
Amount of extent space allocated to this heap
Amount of extent space allocated from this heap
Amount of space utilized in this heap
The ID of the container to which the data pertains. Possible values include:
0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.
1: This value is used for rows containing data that pertain to only the root
n: Where n is the applicable container ID for the rows containing data