Computer system
Database system
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Time limit: 50 minutes
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Multiple attempts are not allowed
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Question 1
What is a database system primarily used for?
Explanation
A database system is designed to store and manage data efficiently, allowing for retrieval and manipulation of that data.
Question 2
Which of the following best describes a database?
Explanation
A database is indeed a structured collection of data that is organized to facilitate easy retrieval and management.
Question 3
In the context of database systems, what does the term 'query' refer to?
Explanation
A query is a formal request for information that retrieves specific data from a database based on defined criteria.
Question 4
Which component is essential for a database system to function?
Explanation
A database management system (DBMS) is required as it acts as the interface between the database and the user or application.
Question 5
What type of data is typically stored in a database?
Explanation
Databases primarily store structured data, which is organized in a defined manner, making it easier to retrieve and manipulate.
Question 6
A company wants to improve its data storage and retrieval methods. They are considering switching to a new database system. Which of the following factors should they most critically analyze in selecting an appropriate database system?
Explanation
The correct answer is 'The scalability of the database system for future growth' because businesses need to ensure that their database system can handle increased loads and data volume over time. While popularity and pricing are factors, they do not guarantee that the system will meet future demands. A good user interface is also beneficial but not as vital as scalability.
Question 7
A university is implementing a new database system to manage student information. They must ensure that the database is secure and that only authorized personnel have access to sensitive data. Which approach should they prioritize when designing their database system?
Explanation
The correct choice is 'Implementing a robust authentication mechanism for user access', as securing sensitive data is paramount for protecting student information. Using the same access level for all staff can lead to unauthorized access; neglecting security for performance compromises data integrity. A complex interface while important, is secondary to establishing secure access protocols.
Question 8
[Case Scenario] A software development team is tasked with creating an application that relies on a robust database system to store user data, transaction histories, and analytics. They need to ensure that the database can support multiple concurrent users and handle large volumes of transactions without degrading performance. Given their previous experiences, they consider implementing either a relational database management system (RDBMS) or a NoSQL database. Question: Which database system should the team choose to best meet the application's demands for data integrity and complex querying?
Explanation
Given the need for data integrity and complex querying, the team should choose an RDBMS. RDBMS systems are designed to handle transactions reliably and provide robust querying capabilities, unlike NoSQL systems that prioritize flexibility and scalability over strong data consistency.
Question 9
[Case Scenario] A university is in the process of developing a centralized database system to manage student records, course registrations, and faculty assignments. The IT department has proposed different database architectures, considering factors such as scalability, data relationships, and ease of access for administrative staff. The team has identified that students, courses, and faculty members are closely related entities that frequently interact with one another in various ways. Question: What database architecture should the university implement to best represent the complex relationships among these entities?
Explanation
The relational model should be selected as it effectively handles complex relationships among students, courses, and faculty, supporting the necessary queries and data integrity that the university requires.
Question 10
[Case Scenario] A small e-commerce startup is experiencing rapid growth and needs to implement a database system that can support an increasing number of daily transactions. Initially, they used a simple spreadsheet to track orders, but now they require a more scalable solution that can also analyze customer behavior for targeted marketing. The founders are considering transitioning to a more sophisticated database system but are unsure if they should use a cloud database service or an on-premises database solution. Question: What factors should the startup consider when deciding between a cloud database service and an on-premises database?
Explanation
The startup must evaluate cost, scalability, and maintenance requirements when choosing between cloud and on-premises databases to ensure they select a solution that meets their growing needs and long-term sustainability.