On the left side of the graphic is a box labeled Database Application. Inside the box are several lines, some labeled "Program code" and one labeled "Procedure call." The Database Application box points to a box labeled Oracle Database. Inside this box is a box labeled SGA. Inside the SGA box is a procedure. The code points to a box labeled PL/SQL engine. Inside this box is another box labeled Procedural Statement Executor. This box points with an arrow labeled SQL to a box labeled SQL Statement Executor.