Naming Conventions
The similar naming conventions apply to all PL/SQL program items and units including the variables, cursors, constants, cursor variables, procedures, exceptions, functions, and packages. The Names can be simple, remote, qualified, or both qualified and remote. For illustration, you might use the procedure name raise_salary in any of the following ways shown below:
raise_salary(...); -- simple
emp_actions.raise_salary(...); -- qualified
raise_salary@newyork(...); -- remote
emp_actions.raise_salary@newyork(...); -- qualified and remote
In the first condition, you basically use the procedure name. In the second condition, you should qualify the name using the dot notation as the procedure is stored in a package named as the emp_actions. In the third condition, using the remote access indicator (@), you reference the database link newyork as the procedure is stored in the remote database. In the fourth condition, you qualify the procedure name and reference the database link.