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Suppose we have two procedures, p1 and p2. We are calling a procedure p2 inside procedure p1 and then p1 into p2. What will be the result?
Unless you code an exit condition, you will be stuck in an infinite loop. This will consume large amounts of CPU on your database server and will never end until you either kill the process, restart the instance or reboot the server. Your procedures will need to check for some condition, and if it is true, do not call the other procedure. Otherwise, an infinite loop will result.