But the system certainly can’t stop operating to go back to fix things up like a TP system would do-the data keeps coming in and the system must do its best to continue processing it. It’s not good if the system misses some of the data coming in. To see why, consider the example of a system that collects input from a monitoring satellite. If they lose some of that input, they ignore the loss and keep on running. They simply process the input as quickly as they can.
Real-time systems generally don’t need or use special mechanisms for atomicity and durability. Real-time systems usually emphasize gathering input rather than processing it, whereas TP systems generally do both.ĭue to the variety of real-world processes they control, real-time systems generally have to deal with more specialized devices than TP, such as laboratory equipment, factory shop floor equipment, or sensors and control systems in an automobile or airplane. Real-time systems and TP systems both have predictable loads with periodic peaks. So not surprisingly, there are many similarities between the two kinds of systems. It responds to a real-world process consisting of end-users interacting with display devices, which communicate with application programs accessing a shared database. TP essentially is a kind of real-time system, with a real-time response time demand of 1 to 2 seconds. TP systems are similar to real-time systems, such as a system collecting input from a satellite or controlling a factory’s shop floor equipment. Bernstein, Eric Newcomer, in Principles of Transaction Processing (Second Edition), 2009 Real-Time Systems
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