Concurrency Control in DBMS
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Concurrency Control in DBMS

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Questions and Answers

What happens when the second process tries to read the data?

  • The data is automatically corrected.
  • The data is in an inconsistent state. (correct)
  • The data is successfully read.
  • The process is halted due to a system error.
  • Which type of transport is likely to be affected by this issue?

  • Osmosis
  • Passive Transport
  • Facilitated Diffusion (correct)
  • Active Transport
  • What chapter will explore this issue in detail?

  • Chapter 5
  • Chapter 3
  • Chapter 7
  • Chapter 6 (correct)
  • What is the result of the data being in an inconsistent state?

    <p>Data corruption</p> Signup and view all the answers

    What is the primary cause of this issue?

    <p>Inconsistent data state</p> Signup and view all the answers

    What is a characteristic of a Multilevel Feedback Queue?

    <p>A process can move between the various queues.</p> Signup and view all the answers

    What is the primary purpose of a Multilevel Feedback Queue?

    <p>To improve system performance.</p> Signup and view all the answers

    In a Multilevel Feedback Queue, which of the following is NOT a possible scenario?

    <p>A process is fixed to one queue.</p> Signup and view all the answers

    What is an advantage of using a Multilevel Feedback Queue?

    <p>It improves system responsiveness.</p> Signup and view all the answers

    Why is a Multilevel Feedback Queue used in operating systems?

    <p>To schedule processes efficiently.</p> Signup and view all the answers

    What is the total number of shares allocated among all processes in the system?

    <p>T</p> Signup and view all the answers

    What percentage of the total processor time will an application receive if it has N shares?

    <p>(N/T)%</p> Signup and view all the answers

    What is the purpose of the POSIX.1b standard?

    <p>To manage real-time threads</p> Signup and view all the answers

    What is the relationship between the number of shares an application has and the processor time it receives?

    <p>Directly proportional</p> Signup and view all the answers

    What is the minimum number of shares an application can have?

    <p>0</p> Signup and view all the answers

    Which of the following is a characteristic of Proportional Share Scheduling?

    <p>Processor time is allocated based on the number of shares</p> Signup and view all the answers

    Study Notes

    Multilevel Feedback Queue

    • A process can move between the various queues.
    • If a process requires 30 shares to enter the system and the current available shares are 20 + 15 + 50 = 85, the admission controller will reject the process.

    Proportional Share Scheduling

    • T shares are allocated among all processes in the system.
    • An application receives N shares where N < T.
    • Each application will receive N / T of the total processor time.

    POSIX Real-Time Scheduling

    • The POSIX.1b standard provides an API for managing real-time threads.
    • The API defines two scheduling classes for real-time threads.
    • The standard enables the management of real-time threads.

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    Description

    Learn about the issues that arise when multiple processes try to access and update data simultaneously, leading to inconsistent states. Explore the concepts and solutions in database management systems.

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