The readers and writers dilemma may be posed in many different ways, depending on which set of processes is being considered. Explain three alternative permutations of the issue, each of which may favor one set of procedures over another. For each iteration, detail what occurs when a reader or writer is ready to access the database, and when a procedure is complete.
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The readers and writers dilemma may be posed in many different ways, depending on which set of processes is being considered. Explain three alternative permutations of the issue, each of which may favor one set of procedures over another. For each iteration, detail what occurs when a reader or writer is ready to access the
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- 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.The readers and writers dilemma may be posed in a number of different ways, depending on the order in which different categories of activities might be initiated. Speculate on three potential permutations of the issue, each of which may favor one set of procedures over another. Describe in detail the behavior of each variant when a reader or writer is ready to access the database and after a procedure has finished.The readers and writers dilemma may be posed in many different ways depending on which set of processes is being considered. Speculate on three potential permutations of the issue, each of which may favor one set of procedures over another. Describe in detail the behavior of each variant when a reader or writer is ready to access the database and after a procedure has finished.
- Maintain a Database Security (Inference Detection Algorithm)Consider a database containing personnel information, including names, addresses, and salaries of employees. Individually, the name, address, and salary information are available to a subordinate role, such as Clerk, but the association of names and salaries is restricted to a superior role, such as Administrator.1. With this information, how could you construct your database and tables? Design your database and draw a database schema first.2. Suppose that administrators want to add a new attribute, employee start date, which is not sensitive. Where would it be? Consider not compromising the relationship between employee and salary. Draw your new schema.Suppose you are asked to design a club database system based on the following information. Each student has a unique student id, a name, and an email; each club has a unique club id, a name, a contact telephone number, and has exactly one student as its president. Each student can serve as a president in at most one of the clubs, although he/she can be the members of several clubs. Clubs organize activities and students can participate in any of them. Each activity is described by a unique activity id, a place, a date, a time and those clubs that organize it. If an activity is organized by more than one club, different clubs might contribute different activity fees.QuestionDraw an E-R diagram for the system according to the above description.In a database, an entity is a collection of characteristics. An entity might be a tangible thing that exists in our world.Each entity has an attribute, which in the real world is referred to as the object's characteristics. For instance, in a company's employment database, the individual, department, and classification may all be considered entities. These entities possess certain traits that will serve as the relevant entity's attributes.
- Maintain a Database Security (Inference Detection Algorithm) Consider a database containing personnel information, including names, addresses, and salaries of employees. Individually, the name, address, and salary information is available to a subordinate role, such as Clerk, but the association of names and salaries is restricted to a superior role, such as Administrator. 1. With this information, how could you construct your database and tables? Design your database and draw a database schema first. 2. Suppose that administrators wants to add a new attribute, employee start date, which is not sensitive. Where would it be? Consider not comprimising the relationship between employee and salary. Draw your new schema.Draw a use-case diagram and create a set of activity diagrams for the following system. A Video Store (AVS) runs a series of fairly standard video stores. Before a video can be put on the shelf, it must be cataloged and entered into the video database. Every customer must have a valid AVS customer card in order to rent a video. Customers rent videos for three days at a time. Every time a customer rents a video, the system must ensure that they do not have any overdue videos. If so, the overdue videos must be returned and an overdue fee paid before customer can rent more videos. Likewise, if the customer has returned overdue videos, but has not paid the overdue fee, the fee must be paid before new videos can be rented. Every morning, the store manager prints a report that lists overdue videos. If a video is two or more days overdue, the manager calls the customer to remind them to return the video. If a video is returned in damaged condition, the manager removes it from the video…Using a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.
- A relational database is to be designed for a medium sized Company dealing with industrial applications of computers. The Company delivers various products to its customers ranging from a single application program through to complete installation of hardware with customized software. The Company employs various experts, consultants and supporting staff. All personnel are employed on longt erm basis, i.e. there is no short‐term or temporary staff. Although the Company is somehow structured for administrative purposes (that is, it is divided into departments headed by department managers) all projects are carried out in an inter‐disciplinary way. For each project a project team is selected, grouping employees from different departments, and a Project Manager (also an employee of the Company) is appointed who is entirely and exclusively responsible for the control of the project, quite independently of the Company's hierarchy. The following is a brief statement of some facts and…Draw an ER diagram that captures the following information: A book identified by (unique Id number, a title and one or more authors), A library identified by (unique name and adders), A borrower has a name and a unique ID code. The library service may own several copies of a given book. A borrower can have many books on loan, but each copy of a book can only be on loan to one borrower. A borrower could borrow the same book on several occasions, but it is assumed that each such loan will take place on a different date. *Make a Database Security (Inference Detection Algorithm) make a database containing personnel information, including names, addresses, and salaries of employees. Individually, the name, address, and salary information is available to a subordinate role, such as Clerk, but the association of names and salaries is restricted to a superior role, such as Administrator. With this information, how could you construct your database and tables? Design your database and draw a database schema first. Suppose that administrators wants to add a new attribute, employee start date, which is not sensitive. Where would it be? Consider not comprimising the relationship between employee and salary. Draw your new schema.