V$SESSION_OBJECT_CACHE

V$SESSION_OBJECT_CACHE displays object cache statistics for the current user session on the local server (instance).

Column	Datatype	Description
PINS	NUMBER	Number of object pins or look-ups in the cache
HITS	NUMBER	Number of object pins that found the object already in the cache
TRUE_HITS	NUMBER	Number of object pins that found the object already in the cache and in the desired state (thus, not requiring refresh from the database)
HIT_RATIO	NUMBER	Ratio of HITS / PINS
TRUE_HIT_RATIO	NUMBER	Ratio of TRUE_HITS/PINS
OBJECT_REFRESHES	NUMBER	Number of objects in the cache that were refreshed with a new value from the database
CACHE_REFRESHES	NUMBER	Number of times the whole cache (all objects) were refreshed
OBJECT_FLUSHES	NUMBER	Number of objects in the cache that were flushed to the database
CACHE_FLUSHES	NUMBER	Number of times the whole cache (all objects) were flushed to the database
CACHE_SHRINKS	NUMBER	Number of times the cache was shrunk to the optimal size
CACHED_OBJECTS	NUMBER	Number of objects currently cached
PINNED_OBJECTS	NUMBER	Number of objects currently pinned
CACHE_SIZE	NUMBER	Current size of the cache (in bytes)
OPTIMAL_SIZE	NUMBER	Optimal size of the cache (in bytes)
MAXIMUM_SIZE	NUMBER	Maximum size of the cache (in bytes)

Note:

1.

SELECT pins, hits, hit_ratio, true_hit_ratio, cached_objects, pinned_objects, cache_size, optimal_size, maximum_size

FROM V$SESSION_OBJECT_CACHE;

PINS	HITS	HIT_ RATIO	TRUE_HIT_ RATIO	CACHED_ OBJECTS	PINNED_ OBJECTS	CACHE_ SIZE	OPTIMAL_ SIZE	MAXIMUM_ SIZE
128	99	0.7734375	0.7734375	21	6	43288	102400	112640

Oracle data dictionary views

Oracle dynamic performance views