You can use triggers with procedures to generate alerts when "out-of-bounds" business conditions exist. One example is to generate a re-stock order for the warehouse when an inventory items' shelf quantity drops below a minimum shelf amount. A more complex job is to calculate the minimum amount of stock necessary and initiate a product reorder process to ensure that product does not go out of stock before it is replenished (by a new shipment). Since the procedure is actually an application program, subroutines could be initiated to provide physical alerts such as a console message, fax message, and so on.
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