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