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Oracle® Database Reference
11g Release 2 (11.2)

E40402-12
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V$LIBRARYCACHE

V$LIBRARYCACHE contains statistics about library cache performance and activity.

Column Datatype Description
NAMESPACE VARCHAR2(15) Library cache namespace
GETS NUMBER Number of times a lock was requested for objects of this namespace
GETHITS NUMBER Number of times an object's handle was found in memory
GETHITRATIO NUMBER Ratio of GETHITS to GETS
PINS NUMBER Number of times a PIN was requested for objects of this namespace
PINHITS NUMBER Number of times all of the metadata pieces of the library object were found in memory
PINHITRATIO NUMBER Ratio of PINHITS to PINS
RELOADS NUMBER Any PIN of an object that is not the first PIN performed since the object handle was created, and which requires loading the object from disk
INVALIDATIONS NUMBER Total number of times objects in this namespace were marked invalid because a dependent object was modified
DLM_LOCK_REQUESTS NUMBER Number of GET requests lock instance locks
DLM_PIN_REQUESTS NUMBER Number of PIN requests lock instance locks
DLM_PIN_RELEASES NUMBER Number of release requests PIN instance locks
DLM_INVALIDATION_REQUESTS NUMBER Number of GET requests for invalidation instance locks
DLM_INVALIDATIONS NUMBER Number of invalidation pings received from other instances