Relational Database Management System Block Diagram!

[Oracle]

Can anyone help me here!? I need to find a 'simplified block diagram of a Relational Database Management System'

Once i've found one, the rest is easy!

Thanks

 

[Oracle]

Thanks, is the first Diagram the simplified block diagram!?

With the 'Office', 'Department' and 'Employee' boxes?

Thanks

EDIT: No, actually, is it the Logical Diagram (the collection of entities and relationships (ER Diagram))