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What is the different between OnLine and RealTime? Is OnLine = RealTime, but RealTime != Online, or else?
thank you.
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Real-time systems are those systems that do not lag and respond instantly. These are different from online systems in the sense that they transform their state with correspondence to real or physical time.
Near real-time processing is when speed is important, but processing time in minutes is acceptable in lieu of seconds. An example of near real-time processing is the production of operational intelligence, which is a combination of data processing and Complete Event Processing (CEP).
Online processing is the ongoing entry of transactions into a computer system in real time. The opposite of this system is batch processing, where transactions are allowed to pile up in a stack of documents, and are entered into the computer system in a batch.
Online in Real Time allows you to watch lectures online, at the scheduled time, from anywhere using your own device. An activity that will be live-streamed will appear with the term OnlineRealTime in the activity field in Allocate+.
Online means that there is some kind of interactivity involved, but doesn't enforce limits in latency.
Real-time means that there are limits on latency.
If you move your computer's mouse, you expect the pointer to react immediately and precisely follow your actions. That's real-time. Another example is playing on a music keyboard controller and having some synthesizer program that generates the sounds.
Online, however, is such that your actions show some response in some timely manner, but there's no timely relationship enforced to it. For example, starting a video stream from a (remotely controllable) webcam may show you the pictures with less than 1-second latency, or even up to several minutes, yet be online.
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real-time:
A task is real-time when the timeliness of the activities' completion is a functional requirement and correctness condition, rather than merely a performance metric. A real-time system is one where some (though perhaps not all) of the tasks are real-time tasks.
Online has a broader meaning and requires a context to be understood correctly. In general case, it's "operational" or "interactive."
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