Since the processing of two different inputs does not affect each other, even if they’re processed concurrently, they’ll behave like a serial execution. In most real-time applications, processing of input messages involves no access to shared data. Real-time systems are generally not concerned with serializability. Thus, the fault-tolerance requirements between the two types of systems are rather different. If there is a failure, it can stop collecting input, run a recovery procedure, and then resume processing input. By contrast, a TP environment can generally stop accepting input for a short time or can buffer the input for awhile. 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 If you wish to continue to the destination link, press Continue.Philip A. We are not responsible for the information collection practices of the other Web sites that you visit and urge you to review their privacy policies before you provide them with any personally identifiable information. We recommend you review their information collection policy, or terms and conditions to fully understand what that business collects. If you provide the business with information, its use of that information will be subject to that business's privacy policy. (Refer to the Privacy & Security section for privacy protections Union Bank provides to its Web site visitors). The information that this private business collects and maintains as a result of your visit to its Web site, and the manner in which it does so, may differ from the information that Union Bank collects and maintains. If you accept third-party goods or services advertised at our website, the third party may be able to identify that you have a relationship with us (for example, if the offer was made only through our site). ![]() ![]() By linking to the website of this private business, Union Bank is not endorsing its products, services, or privacy or security policies. By clicking on the link below, you will leave the Union Bank website and enter a privately owned website created, operated, and maintained by another unaffiliated business.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |