The readers and writers conundrum may be framed in several ways about which category of activities can be started when. Explain three variants of the issue that favor various methods. Specify what occurs when a reader or writer is ready to access the database and when a procedure is done for each variant?
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The readers and writers conundrum may be framed in several ways about which category of activities can be started when. Explain three variants of the issue that favor various methods. Specify what occurs when a reader or writer is ready to access the
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- What are the benefits of using a transaction to group database operations together that need to either all complete or be rolled back so none of them complete? Here is an example of when a transaction should definitely be used to be helpful: When any bank / financial institution processes a transfer of money from one account to another account, the operations involved are always (1) to subtract a given amount of money from the source account and (2) add that same amount of money to the destination account. They have to be sure the software doing the transfer groups the above 2 required database operations in a transaction to ensure that if there is any system error/problem during these operations there is no way that money could be accidentally subtracted from an account but not added to the account it is supposed to be transferring to or customers will be very upset at the loss of money!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.A database at a college is required to support the following requirements. Complete the information-level designfor this set of requirements. Use your own experience to determine any constraints you need that are not statedin the problem. Represent the answer in DBDL.a. For a department, store its number and name.b. For an advisor, store his or her number and name and the number of the department to which he or she isassigned.c. For a course, store its code and description (for example, MTH110 or Algebra).d. For a student, store his or her number and name. For each course the student has taken, store thecourse code, course description, and grade received. In addition, store the number and name of thestudent’s advisor. Assume that an advisor may advise any number of students but that each studenthas just one advisor.
- Normalization is one of the important processes while designing databases. Normalization is actually a technique for reviewing the database design and it includes a set of mathematical rules. Answer the following questions using specific examples: Does normalization always lead to a good design? Why or why not?My thought is that it only eliminates redundancy and shrinks the database from being too large. What kind of issues, problems are possible in the normalization process?Give at least three reasons why restrictions should always be imposed by the database rather than the application.Normalization is one of the important processes while designing databases. Normalization is actually a technique for reviewing the database design and it includes a set of mathematical rules. Answer the following questions using specific examples: Does normalization always lead to a good design? Why or why not? What kind of issues, problems are possible in the normalization process?
- 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 execution of a trigger may result in the execution of another action. The depth of layering in most database systems is limited. Explain why they would put such a restriction in place.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.
- Database normalization is a very important process in designing and organizing tables (relations) and their columns (attributes or fields) in a relational database. Therefore, what are the consequences (problems) if a database was designed without it? Would the database still work?1. Create a database diagram that shows the relationships between the seven tables in the MyGuitarShop database. (The administrators table is not related to the other six tables.) 2. Design a database diagram for a database that stores information about the downloads that users make from a website. Each user must have an email address, first name, and last name. Each user can have one or more downloads. Each download must have a filename and download date/time. Each product can be related to one or more downloads. Each product must have a name.1. Create a database diagram that shows the relationships between the seven tables in the MyGuitarShop database. (The administrators table is not related to the other six tables.)2. Design a database diagram for a database that stores information about the downloads that users make from a website.Each user must have an email address, first name, and last name.Each user can have one or more downloads.Each download must have a filename and download date/time.Each product can be related to one or more downloads.Each product must have a name.