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
4.1.1 State TWO specific requirements relevant to the content of a primary key field.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The primary key must be unique for each record in the table to ensure that every entry can be distinctly identified without ambiguity.
The primary key field cannot be null; every record must have a value for the primary key to maintain data integrity.
Step 2
4.1.2 (a) Identify a suitable foreign key and give the name of the field and the name of the table that contains the field.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A suitable foreign key is 'ImporterID' from the table 'tblApplications'. This field references the 'ImporterID' field in the 'tblImporters' table.
Step 3
4.1.2 (b) Name the type of relationship between tables tblImporters and tblApplications.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The relationship type between the two tables is 'One to Many', where one importer can have multiple applications.
Step 4
4.1.3 Name the diagram used to illustrate the relationship between the two tables.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The diagram used to illustrate the relationship is the 'Entity Relationship Diagram'.
Step 5
4.2 Suggest a more appropriate data type for the Approved field in the tblApplications table.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A more appropriate data type for the Approved field could be 'Boolean' since it can represent two states: approved (true) or not approved (false).
Step 6
4.3 Explain why the ProcessedDuration field in the tblApplications table is redundant.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The ProcessedDuration field is redundant because the duration can be calculated by subtracting the DateReceived from the DateProcessed. Thus, storing this information again is unnecessary.
Step 7
4.4.1 Explain what is meant by the term beta version.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A beta version refers to a pre-release version of software that is made available for testing to a limited user group. It allows for the identification of bugs and issues before the final release.
Step 8
4.4.2 Suggest a way in which the system can be adapted so that the name of a country is captured uniformly in the ImporterCountry field.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To ensure uniformity in capturing country names, the system can implement a dropdown menu or a predefined list of country names, preventing any variations in spellings or abbreviations.
Step 9
4.5.1 Data validation.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Data validation ensures that the input received for the Approved field adheres to specific rules, such as only allowing values of 0 or 1, thus minimizing inaccuracies and ensuring data correctness.
Step 10
4.5.2 Data verification.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Data verification involves checking the input values against external sources or human perspective to ensure that the data recorded is accurate and trustworthy.
Step 11
4.6 Suggest any TWO physical ways in which access to the database server can be restricted.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Implementing biometric security measures, such as fingerprint or facial recognition, to restrict physical access to the database server.
Utilizing secured entry systems that require access cards or codes to enter the server room.
Step 12
4.7.1 Explain the term data independence.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Data independence refers to the separation of data and the applications that manipulate it. It allows changes to be made to the database's structure without affecting the applications using the data.
Step 13
4.7.2 Explain one level of data independence.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One level of data independence is 'Logical Independence', which allows for changes in the logical schema (the structure of the database) without altering the external schema (how the data is viewed by users).
Step 14
4.7.3 Any TWO.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The user or application cannot alter the structure or format of the data managed by the DBMS.
Multiple applications can interact with the same data, ensuring consistency and reducing redundancy, as the physical structure remains abstracted.
