You are tasked with designing a database schema for a Student Learning Management System (LMS) that allows users to enroll in courses, access learning materials, submit assignments, and track their progress. The system will have the following requirements:

1. Students can register accounts and log in to access the system.
2. Courses are offered by instructors and can be enrolled in by students.
3. Each course has multiple modules, each containing learning materials such as lectures, quizzes, and assignments.
4. Students can submit assignments and view their grades.
5. Instructors can create, edit, and delete courses and modules, as well as grade assignments submitted by students.

a) Database Design:

1. Identify the entities and relationships relevant to the LMS domain. Describe how you would represent these entities using database tables, columns, and relationships.
2. Design the database schema including tables for students, courses, modules, assignments, grades, instructors, and any other necessary entities. Specify primary keys, foreign keys, and any constraints.
3. Discuss the normalization process and explain how you would apply normalization techniques to ensure the integrity and efficiency of the database schema.

b) User Authentication and Authorization:

1. Outline the steps you would take to implement user authentication and authorization in the LMS database system. How would you securely store user passwords and authenticate users?
2. Describe the role-based access control (RBAC) model you would use to manage user privileges within the LMS. What roles would you define for students, instructors, and administrators?

c) Functional Requirements:

1. Write SQL queries to perform the following tasks:
   • Retrieve a list of courses enrolled in by a specific student.
   • Display the learning materials (lectures, quizzes, assignments) for a given module in a course.
   • Calculate the average grade for assignments submitted by a student in a specific course.
2. Discuss the indexes you would create to optimize the performance of the database queries in the LMS system.

d) Data Integrity and Security:

1. Explain the measures you would implement to ensure data integrity within the LMS database system. How would you enforce constraints and validations to prevent data inconsistencies?
2. Discuss the importance of data encryption and access control mechanisms in safeguarding sensitive information stored in the LMS database. How would you encrypt data at rest and in transit?

Answer rating: 100% (QA)

a Database Design Entities and Relationships 1 Students Information about students who register in the system 2 Courses Details of courses offered inc... View the full answer