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 |
Oracle data dictionary views
Last updated: 2009-11-05 Thursday |
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