Neco 2018 Data Processing (Objective and Essay) Answers – June/July Expo

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DATA PROCESSING

(1a)

Database security refers to protective digital privacy measures that are applied to prevent unauthorized access to computer, databases and websites

(1aii)

(i) Database security ensure that physical damage to the server doesn't result in the loss of data

(ii) Database security block attacks from unauthorised users or hackers. this prevents the loss of sensitive information

(iii) Database security prevent malware infections and stop viruses stealing data

(1bi)

(i) Physical data model

(ii) Conceptual data model

(iii) Canonical data model

(iv) Application data model

(1bii)

Physical data model: Physical data models describe how data is stored in the computer, representing information such as record structures, record ordering and access paths. it also represents how the model will be built in the database

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(4i)

Mobile phone: Mobile phone also known as cellular phone , cell phone and a hand phone is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area. it does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network

(4ii)

Vending machine: A  vending machine is a machine which dispenses items such as snacks, beverages, alcohol, cigarettes, lottery tickets, cologne, customer products and even gold and gems to customers automatically, after the customer inserts currency or credit into the machine.

(4iii)

Cash Register: A cash register also referred to as  a mechanical or electronic device for calculating and recording sales transactions and an attached cash drawer for storing cash. The cash register also usually prints a receipt for the customer

(4iv)

Fax machine: Fax machine also known as facsimile or tele copying, is the telephonic transmission of scanned printed material, both text and images, normally to a telephone number connected to a printer or other output device. The receiving fax machine reconverts the coded image, printing a paper copy.

(4v)

Point of sale machine: A point of sale/service(POS) machine is used to conduct retail transactions. It can provide many services, including credit card processing, check reading and cash transactions, depending on the model.

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(5a)

(i) Data models can facilitate interaction among the designer, the applications programmer and the end user.

(ii) Data models can  greatly improve user  experience and increase  the efficiency of data utilization.

(iii) Data models make data statistics more consistent and reduce the possibility of computing errors

(iv) Data models can significantly reduce unnecessary data redundancy, reduce the storage and computing costs for a big data system

(5aii)

A standard data model or industry standard data model(ISDM)is a data model that is widely applied in some industry and share amongst competitors to some degree. They  are often defined by standards bodies, database vendors or operating system vendors

(5b)

(In Tabular form)

Under PREVENTIVE MAINTENANCE:

(i) Preventive maintenance is the  act of a regularly scheduled check of the computer hardware or  software to help ensure it  continues to operate  properly.

(ii) Preventive maintenance in computer system is done frequently(preventing problem)

Under CORRECTIVE MAINTENANCE:

(i) Corrective maintenance  is a form of maintenance  that is performed after a  fault or problem emerges  in the system, with the  goal of restoring  operability.

(ii) Corrective maintenance in computer system is done randomly (when problem occurs)

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(6ai)

Napier's bones is a manually-operated calculating device created by John Napier of Merchiston for calculation of products and quotients of numbers. 

(6aii)

The Jacquard machine is a device fitted to a power loom that simplifies the process of manufacturing textiles with such complex patterns as brocade, damask and matelassé. It was invented by Joseph Marie Jacquard in 1804. 

(6aiii)

(i) Abacus

(ii) Raymon Lull 

(iii) Prior Analytics 

(iv) Slide rule

(6bi)

Uses of spreadsheets package:

(i) To create budgets

(ii) To produce graphs and charts 

(iii) For storing data

(iv) For sorting data

(6bii)

(i) Title bar: It is used to display the name of the package 

(ii) Status bar: It is used to display certain status information depending upon the package or device. 

(iii) Row heading: It is used to identify each row in the worksheet. 

(iv) Menu bar: It is used for opening files, interacting with an application, or displaying help documentation or manuals.

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