A2 OCR ICT: Chapter 2 - Processing systems

> A batch processing systems processing batches of data at regular intervals.

> It usually process' large amounts of data at a time.

> The data in each batch is of the same type.

> The data is stored in batches and sent to be processed at a time when there is less demand on the system, EG. At night or at the weekend. This means that the system is not slowed down when it is in use the most.

Advantages: System is not disrupted as it updates when the system is not in use.

Disadvantages: System only updates when the data is processed, which doesn't happen until night or the weekend.

Uses: Utility bills, Bank statements and payroll data.

> An interactive processing system is also known as a transactions processing system.

> This type of system handles transactions one at a time and has to finishing process each transaction and given the user a reply before it can start the next one.

> Each transaction is usually small.

> This type of of system usually involves a user entering data with via a keyboard onto a form on screen.

> This system uses GUI and pre-set questions.

Advantages: When booking tickets no double bookings can be made since each one is processed one at a time.

Disadvantages: Pre-set questions so limited input.

Uses: Booking tickets.

> A real-time processing system processes data as it is inputed.

> The data has to be processed within a set period of time.

Advantages: Data is processed instantly, A response is given with 4 seconds.

Disadvantages: If the user makes a mistake it will go onto the system straight away.

Uses: Air-traffic control system, mobiles.

> Batch - processed when the system is not busy/off-line. Delayed response time, There is a delay between the data being put and the results, can take up to several days. Theuser interface is usually code-based

> Interactive - Each transaction is completed before starting the next one. The response time depends on action from the end-user. The user interface is GUI ( Graphical user interface)

> Real-Time - Data is processed as soon as it is received by the processor. Very quick response time, usually less than 4 seconds. The interface depends on the user's requirements.