SCENARIO
A media company is responsible for managing the publishing of a wide variety of local and international magazines - NSC Information Technology - Question 4 - 2021 - Paper 2
Question 4
SCENARIO
A media company is responsible for managing the publishing of a wide variety of local and international magazines. An MS Access database is used to manage ... show full transcript
Worked Solution & Example Answer:SCENARIO
A media company is responsible for managing the publishing of a wide variety of local and international magazines - NSC Information Technology - Question 4 - 2021 - Paper 2
Step 1
What is a relational database?
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Answer
A relational database is a collection of multiple tables linked together in a relationship through primary and foreign keys. These tables store data in a structured format, allowing for efficient retrieval and manipulation of information.
Step 2
Name and explain ONE anomaly that can occur in an operational database if the database is not normalised.
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One possible anomaly is an 'Insertion anomaly.' This occurs when the database is structured in such a way that essential data cannot be added without the presence of other existing data, which may be unavailable or unrelated.
Step 3
Identify THREE fields in the table tblMagazines that require more suitable data types.
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ReleaseDate: Suggested field name is 'ReleaseDate' with type 'Date/Time'.
Price: Suggested field name is 'Price' with type 'Currency'.
eMagazine: Suggested field name is 'eMagazine' with type 'Boolean'.
Step 4
Draw an ERD of tblPublishers and tblMagazines showing the following: The relationship type between the entities, A suitable action verb describing the relationship.
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The ERD would show a one-to-many relationship between tblPublishers and tblMagazines. The action verb could be 'publishes,' indicating that a publisher can publish multiple magazines.
Step 5
Explain what data integrity entails.
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Data integrity refers to the accuracy, consistency, and reliability of data stored in a database. It ensures that the data remains correct and unaltered during its lifecycle.
Step 6
Apart from normalisation, state ONE other way to ensure data integrity in a database.
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One other way to ensure data integrity is through implementing validation rules within the database management system to verify that all entered data conforms to defined formats and requirements.
Step 7
State TWO ways in which the company can benefit from the use of a database management system.
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A database management system can improve data retrieval speed and efficiency, reducing redundancy and improving overall organizational structure.
It enhances data security by providing controlled access and backup solutions.
Step 8
Suggest ONE way to minimise user input.
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Implementing default values for fields in the database forms can minimize user input, thus reducing the chances of errors during data entry.
Step 9
Explain why using a server-based database instead of a desktop database system would be the better option in a company.
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A server-based database is better suited for handling large volumes of data and multiple user access simultaneously. It allows for centralized data management, which increases collaboration and data integrity.
Step 10
How does data warehousing affect the size of a database?
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Data warehousing can increase the size of a database by storing large volumes of historical data for analysis, which may not be part of the operational database. However, it also helps in effective data management and retrieval.
Step 11
Name ONE role of a human in data mining.
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One role of a human in data mining is to interpret the results of data analysis, providing valuable insights and actionable strategies based on the mined data.
