Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

12 ipt 0501 transaction processing systems 01

897 views

Published on

Published in: Education
  • Be the first to comment

12 ipt 0501 transaction processing systems 01

  1. 1. Transaction Processing Systems
  2. 2. • Transaction processing systems (TPS’s) are those information systems that work with the transactions of an organisation. • A transaction is an event that creates or modifies data that is stored in an information system. • TPS’s differ from other systems in that they directly support businesses. • The four important characteristics of a TPS are rapid response, reliability, inflexibility and controlled processing.
  3. 3. • Rapid response: Businesses require quick turnaround time. • Reliability: Organisations rely on their TPS. If it does fail quick and accurate recovery is essential. • Inflexibility: Transactions require similitude of data. Non-standard operations would lead to errors and a slower response time. • Controlled processing: The TPS should enforce the organisational operations in the manner that it allocates rights and responsibilities.
  4. 4. • A TPS minimises the organisation’s costs through a reduction of data handling. • This means that procedures need to be examined and data needs to be normalised. • There are two types of transaction processing: real-time processing and batch processing. • Batch processing is where all the transaction data is collected and processed at a specific time.
  5. 5. • Real-time processing is the immediate processing of data. • It provides instant confirmation of the transaction. • Two common examples are airline reservation systems and banking. • The two main concerns with real time processing are concurrency and atomicity. • Concurrency ensures that two users cannot change the same data at the same time.
  6. 6. • Atomicity ensures that all the steps involved in a transaction are completed successfully as a group. • That is, if the first step succeeds and then further steps fail the entire transaction is abandoned and the processes are rolled back. • All real time transactions have an acceptable user response time factored in. • If the user exceeds this response time then the transaction is also abandoned.
  7. 7. • Real time processing is more expensive than batch processing due to increased hardware and software costs. • A transaction processing monitor is software that runs in the background that allows transaction processing applications to run efficiently. • Differences between real-time and batch processing: (p.116)

×