Option topic 1: Transaction processing systems
Timing and resources
Time: 5 weeks
Syllabus: pages 44–47 Section 9.4.1
Text: Heinemann IPT HSC—G. K. Powers (chapter 4)
H1.1Applies an understanding of the nature and function of information technologies to a specific practical situation
H1.2Explains and justifies the way in which information systems relate to information processes in a specific context
H2.1Analyses and describes a system in terms of the information processes involved
H2.2Develops solutions for an identified need which address all of the information processes
H3.1Evaluates the effect of information systems on the individual, society and the environment
H3.2Demonstrates ethical practice in the use of information systems, technologies and processes
H4.1Proposes ways in which information systems will meet emerging needs
H5.2Assesses the ethical implications of selecting and using specific resources and tools
Students learn to:
1.Characteristics of transaction processing systems
(a)Describe a TPS as information systems that collect, store, modify and retrieve transactions of an organisation.
(b)Outline characteristics of a TPS—rapid response, reliability, inflexibility, controlled processing.
(c)Identify, describe and use batch transaction processing—advantages and disadvantages.
(d)Identify, describe and use real-time transaction processing—concurrency, atomicity, advantages and disadvantages.
(e)Compare and contrast batch and real-time transaction processing.
(f)Understand the significance of data validation—transaction initiation, field checking.
(g)Describe the historical significance of transaction processing systems.
(h)Assesses the work routine of a manual transaction system.
2.Examples of transaction processing systems
(a)Describe the components of a transaction processing system—users, participants, people.
(b)Describe real-time transaction processing systems in terms of participants, data/information and information technology:
library loan system.
(c) Describe batch transaction processing systems in terms of participants, data/information and information technology:
credit card sales transactions.
3.Storing and retrieving
(a)Describe the storage of data into databases and files—hierarchical database, network database, relational database, master file, transaction file, report file, work file, programs file.
(b)Understand a data warehouse—data that is consolidated, subject-oriented, historical, read-only.
(c)Select and apply backup procedures—recovery, journal, checkpoint, backward recovery, forward recovery, magnetic tape, grandfather-father-son, partial backup.
(d)Update in batch—sequential access, information technology.
(e)Update in real time—direct access, information technology.
4.Other information processes
(a)Describe collecting data for a TPS—MICR, ATM, barcode readers, paper forms, on-screen forms, Web forms.
(b)Design and justify paper forms to collect data for batch processing.
(c)Design user-friendly screens for on-line data collection.
(d)Describe analysing data for a TPS—decision support systems, data mining, management information systems.
5.Issues related to transaction processing systems
(a)Identify the issue of nature of work—automation of jobs, people as participants.
(b)Understand the need for non-computer procedures to deal with transactions when the computer is not available.
(c)Identify the issue of bias.
(d)Describe the importance of data in transaction processing—data security, data accuracy, data integrity.
(e)Describe control in transaction processing.
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