Could you explain these terms more?

Could you explain these terms more?
PINs
RELOADs
INVALIDATIONs
SQL> desc v$librarycache
Name                                                                  Null?    Type
NAMESPACE                                                           VARCHAR2(15)
GETS                                                                  NUMBER
GETHITS                                                               NUMBER
GETHITRATIO                                                                NUMBER
PINS                                                                       NUMBER
PINHITS                                                                    NUMBER
PINHITRATIO                                                                 NUMBER
RELOADS                                                                    NUMBER
INVALIDATIONS                                                               NUMBER
DLM_LOCK_REQUESTS                                                          NUMBER
DLM_PIN_REQUESTS                                                            NUMBER
DLM_PIN_RELEASES                                                          NUMBER
DLM_INVALIDATION_REQUESTS                                                NUMBER
DLM_INVALIDATIONS                                                          NUMBERFrom the Oracle® Database Reference, I get the following interpretation:
PINS :      Number of times a PIN was requested for objects of this namespace
PINHITS:      Number of times all of the metadata pieces of the library object were found in memory
RELOADS:      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: The total number of times objects in this namespace were marked invalid because a dependent object was modified
But I still cannot understand the following these terms clearly. Could you explain them more?
PINs
RELOADs
INVALIDATIONs
More over, I don't think the previous interpretation of INVALIDATIONs is precise. In my view,the interpretation should be: the times of Library cache misses happened because invalidations occurred due to DDL on the dependant objects.
What is your opinions?
Thanks

Loads - Number of times the object has been loaded. This count also increases when an object has been invalidated.
# Gets - Number of times the system requests handles to library objects belonging to this namespace
# Pins - Number of times the system issues pin requests for objects in the cache in order to access them.
# Reloads - Number of times that library objects have to be reinitialized and reloaded with data because they have been aged out or invalidated.
Invalidations - Number of times that non-persistent library objects (like shared SQL areas) have been invalidated.
more information
http://vsbabu.org/oracle/sect13.html
OCP Oracle 9i Performance tuning Study guide BPB publications.

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