However, over-allocating free space may result in wasted DASD space, less data transferred per I/O, less efficient use of buffer pools and more pages to scan.

Most often, you want only a small subset of the data in the table, so a full table scan wastes a lot of disk I/O and therefore time.

This system has high economy because of using itinerant monitor to analogy signals that made by PLC modules, using LED display and scan keyboard as press buttons that made by PLC dynamic I/O modules.