SCENARIO
The import of plants can be dangerous as the plants may be invasive or introduce diseases to native plants and ecosystems - NSC Information Technology - Question 4 - 2020 - Paper 2
Question 4
SCENARIO
The import of plants can be dangerous as the plants may be invasive or introduce diseases to native plants and ecosystems. A rigid testing process must fir... show full transcript
Worked Solution & Example Answer:SCENARIO
The import of plants can be dangerous as the plants may be invasive or introduce diseases to native plants and ecosystems - NSC Information Technology - Question 4 - 2020 - Paper 2
Step 1
State TWO specific requirements relevant to the content of a primary key field.
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Answer
The data in the primary key field must be unique; there cannot be any duplicates.
The primary key field cannot be null or empty.
Step 2
Identify a suitable foreign key and give the name of the field and the name of the table that contains the field.
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Answer
The suitable foreign key is ImporterID, and it belongs to the table tblApplications.
Step 3
Name the type of relationship between tables tblImporters and tblApplications.
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The type of relationship is One to Many.
Step 4
Name the diagram used to illustrate the relationship between the two tables.
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The diagram is known as an Entity Relationship Diagram (ERD).
Step 5
Suggest a more appropriate data type for the Approved field in the tblApplications table.
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A more appropriate data type for the Approved field would be a Boolean data type, which can represent TRUE/FALSE values.
Step 6
Explain why the ProcessedDuration field in the tblApplications table is redundant.
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The ProcessedDuration field is redundant because the duration can be derived from the difference between the DateProcessed and DateReceived fields, thus not requiring a separate field.
Step 7
Explain what is meant by the term beta version.
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A beta version is a stage in software development that comes after the alpha stage. It is a version of the software that is made available for testing typically by a limited number of users. This helps identify bugs and usability issues before the software is officially released.
Step 8
Suggest a way in which the system can be adapted so that the name of a country is captured uniformly in the ImporterCountry field.
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To ensure uniformity, the system can utilize a dropdown list or combo box for the ImporterCountry field. This limits user input to predefined country names, reducing the risk of capturing variations.
Step 9
Data validation.
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Data validation checks and ensures that the data entered for the Approved field falls within a specific range, for example, either 0 or 1 (where 0 denotes denial and 1 denotes approval). This can be achieved through validation rules in the database.
Step 10
Data verification.
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Data verification involves checking the correctness of the information against a source, such as ensuring that all approved applications match the corresponding entries in tblApplications.
Step 11
Suggest any TWO physical ways in which access to the database server can be restricted.
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Implement controlled access to the building housing the servers through biometric security measures like NFC or RFID.
Place servers and storage devices in a locked room or cabinet, with access granted only to authorized personnel.
Step 12
Explain the term data independence.
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Data independence refers to the separation between the database application and the actual data structure managed by the DBMS. Changes to the database structure do not affect the applications using the data.
Step 13
Logical independence.
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Logical independence is the ability to change the logical schema without having to change the application programs. This allows for adjustments in the data model without interfering with existing data access methods.
Step 14
Any TWO characteristics of data independence.
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The user/software/application cannot alter the structure or format of the data at the database layer.
Multiple applications can interface with the same data because the physical structure does not need to be altered, ensuring efficient data management.
