Database system concepts exercise answers

    • How many questions are in the database system exam?

      Final Exam: Introduction to Database Systems This exam has seven problems, each worth a different amount of points. Each problem is made up of multiple questions. You should read through the exam quickly and plan your time-management accordingly.

    • What is an example of a consistent database?

      For example, in a bank database, moneyshouldneverbe”created”or”deleted”withoutanappropriatedeposit or withdrawal. Every transaction should see a consistent database. 159 160 Chapter 16 (c)Isolationensures that a transactioncan run independently, without consider- ing any side effects that other concurrently running transactions might have.

    • What database system should I use to store company data?

      Answer 3.14 Answer omitted. Exercise 3.15 Consider the Notown database from Exercise 2.5. You have decided to recommend that Notown use a relational database system to store company data. Show the SQL statements for creating relations corresponding to the entity sets and relationship sets in your design.

    • [PDF File]Introduction - Database System Concepts

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      H A P T E R 1 Introduction Practice Exercises 1.1 This chapter has described several major advantages of a database system. What are two disadvantages? Answer: Two disadvantages associated with database systems are listed below. Setup of the database system requires more knowledge, money, skills, and time.

    • [PDF File]CS 348 Introduction to Database Systems (Fall 2012)

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      (a) What are the three major steps of the database design (data modeling) process? De ne each by one sentence. Solution: Conceptual modeling: The process of identifying the entities, their proper-ties, and the relationships among these entities that are part of the environ-ment that the information system models. In our case, we used E-R model

    • [PDF File]Midterm Exam: Introduction to Database Systems: Solutions

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      +1 “Student” is connected to “answers” with either a regular or a bold line +1 “answers” is either connected to “Exam”, “Question”, or to an aggregate surrounding “Exam”, “on”, and “Question”, with a regular line. -1 Extraneous markings were included, such as bolding a relation other than Overseer or

    • [PDF File]Final Exam: Introduction to Database Systems

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      Locking is the most popular concurrency control technique implemented by commercial database management systems. 1. Consider a database that is read-only (i.e., no transactions change any data in the database, data may be loaded into the database when the database is off-line). Suppose serializability needs to be supported.

    • [PDF File]DATABASE MANAGEMENT SYSTEMS SOLUTIONS MANUAL THIRD EDITION

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      INTRODUCTION TO DATABASE SYSTEMS Exercise 1.1 Why would youchoosea databasesysteminstead ofsimply storingdata in operating system files? When would it make sense not to use a database system? Answer 1.1 A database is an integrated collection of data, usually so large that it has to be stored on secondary storage devices such as disks or tapes ...

    • [PDF File]Final Exam: Introduction to Database Systems

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      J. Hellerstein Final Exam Final Exam: Introduction to Database Systems This exam has seven problems, each worth a different amount of points. Each problem is made up of multiple questions. You should read through the exam quickly and plan your time-management accordingly.

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