This latch serializes access to the objects in the library cache.Every time a SQL statement,a PL/SQL block or a stored object(procedure,package,function,trigger)is parsed or executed,this latch is acquired.Problem-...
This event controls the concurrency between clients of the library cache.It acquires a lock on the object handle so that either:One client can prevent other clients from accessing the same object The client can maintain a ...
Library cache pins are used to manage library cache concurrence.Pinning an object causes the heaps to be loaded into memory(if not already loaded).PINS can be acquired in NULL,SHARE or EXCLUSIVE modes and can be considered...