Swift response 7) Explain the difference between concurrency and atomicity. 1) What is a transaction processing system? 1. Transaction processing system (TPS): transaction processing system record and process data, resulting from a business transaction. Dependable & readjustment. The four important characteristics include, -Turnaround time from transaction input to the production output must be a few seconds or less, -If failure occurs, recovery must be quick and accurate, -Every transaction must be processed in the same way, -Flexibility results in too many opportunities for non standard operations, resulting in problems due to different transaction data, -Must support an organisation's operations, -If roles and responsibilities are allocated, the TPS should maintain these requirements, -TPS systems reduce costs by reducing number of times data must be handled, -Collects the transaction data as a group and processes it later, -Used for pay cheques and when a time delay does not decrease the usefulness of the results, Errors cannot be corrected during processing, Sorting the data is expensive and time consuming, -Instant confirmation of a transaction but does require access to an online database, -Uses a terminal or workstation to enter data and display the results of the TPS, -A network links terminals to mainframe computer, -large number of users simultaneously perform transactions(requests are also simultaneous), Concurrency: Two users cannot change the same data at the same time, E.g if an airline agent has reserved the last seat, another agent cannot tell another passenger that seat is available, Atomicity: all steps involved in a transaction are completed successfully, -if any steps fail no other should be completed, -E.g transferring money between accounts(the withdrawal must succeed for the transfer to succeed), -The response time delay must be acceptable for the application to be considered real time, -Main disadvantage=expense, due to hardware and software, -Software that allows the transaction processing application programs to run efficiently, -Provides standard interface between input devices, programs and DBMS, -Ensures transactions do not get lost or corrupted, Real time requires more availability of master file for updating and referencing, Real time has fewer errors, as in batch the data is organised and stored before updating, Infrequent, yet tolerable, errors can occur in batch, More computers are required in real time processing, More difficult to maintain a real time system, -Used to check the entry of transaction data to ensure the transactions are correct and have been accurately stored in the database, Transaction initiation: Used to acknowledge that the TP monitor is ready to receive the transaction data. Examples of users at this level of management include cashiers at … Figure 3-1 Online Transaction Processing Systems. 100% 100% found this document useful, Mark this document as useful. People in the environment only … when the firm collects data from transactions as they occur, placing them in groups or batches, then prepares and processes the batches periodically. Reliability:Due to the involvement of cash, the reliability of TPS has to be in place. Take the provided data by the TPS and use it in another information system. This includes storing, formatting, processing, retrieving, and creating some new aggregate data” Wikipedia Definition: “Transaction processing is a style of computing that divides work into individual, indivisible operations, called transactions. 11. The system is useful when something is sold over the internet. 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A transaction is any event that passes the ACID test in which data is generated or modified before storage in an information system Features of Transaction Processing Systems A transaction process system (TPS) is an information processing system used in business transactions that involves the collection, retrieval and modification of the entire transaction data. Reliability: Due to the involvement of cash, the reliability of TPS has to be in place. In batch processing, transaction data are accumulated over a period of time and processed periodically. Transaction processing system (TPS), an information system (IS) mostly used by managers in operational management to record internal transactions, economic events that occur within an organization and external transactions where the business event took place outside the organization to make operational decision. Users. 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