What is Procedure?
Data Dict Tables (user_procedures | user_errors [Text] | user_source [Text])
How to Create it?
How to Execute it?

Parameter Mode IN OUT IN OUT.

CALL BY VALUE (OUT | IN OUT)| CALL BY REFRRENCE (IN)
CALL BY VALUE (OUT | IN OUT) => CALL BY REFRENCE (NOCOPY Hint)



-- Phone Format Sp 

		New Format | Success | No Error
		             Failuer | Error Msg 

4 Points -> parameter List  
Procedure Overloading.
Notations (Named | Unnamed | Mixed | Error)

Local Procedure 
PRAGMA autonomous_transaction. 
How to Recompile Procedure.
How to DROP Procedure.