Consider a scenario where two students are vying for registration in a course that has a limited capacity of one spot. What characteristic of a database system prevents both students from obtaining the last remaining seat?

The preceding examples demonstrate that such connections are impossible in a relational database.

In campus management system, one of the work flows has following description; A Student submits admission form to apply for admission in university. The form is evaluated and approved forms are shortlisted. Shortlisted students are invited for interview. After interview of students, selected forms are stored in database. You are required to draw a Data Flow Diagram of above scenario.

Implementations of database systems often employ strict two-phase locking. Why is this technique so well-liked and regarded?

When it comes to a bank's database, consider a system that uses snapshot isolation. In certain cases, the bank may encounter difficulties due to an execution that cannot be serialized.

Create an ER diagram that correctly describes the database for exams at Campus in Bäcksvängen in accordance with the following description: (Own assumptions must be clearly described.) Staff for various functions are involved in the exams. All staff have a full name and a unique staff code. Some people are examiners on one or more courses. A course has one name and one unique ladok code. For a course, you can add up its points based on the associated elements. One part is part of a course (for example an exam, a laboratory or project). A course can have several different parts. An element has a name, a description, a torque code, one point and two or more grades (eg: U, G, VG). An element can only belong to one course. Since the database is to process the exams, it is obvious that a part like described as an examination has an examination opportunity that is identified, among other things, by the date, start time, end time and that it is possible to calculate total writing time. A…

Describe the concept of "lazy loading" in the context of database connectivity.

Describe different types of constraints that we can consider when we define the database schema.

Suppose a database system is without concurrency control. Describe an example that the concurrency of multiple transactions results in inconsistency in the database. You can take the banking system, ticket booking system or any other database system for example.   Please explain the outer-schema, schema, inner-schema structure of database system.

Draw the ER diagram based on the following specification. A tutorial school is using a database to manage information about teachers, courses, and students. Each teacher is identified by staff_id, has a name, an email address, and a phone number. Each student is identified by student_id, has a name, an email address, and a registration date. Each course is identified by course_id, year, and semester. In addition, each course has a name. Each course is associated with multiple lessons. A lesson has a lesson number, a location, a date, a start-time, and an end-time. Lesson numbers are sequentially numbers, starting from 1, generated separately for each course. Each teacher teaches at least one course. Each student takes at least one course. Each course is taught by one teacher. Each course can be taken by many students.