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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?

Data corruption Signup and view all the answers

What is the primary cause of this issue?

Inconsistent data state Signup and view all the answers

What is a characteristic of a Multilevel Feedback Queue?

A process can move between the various queues. Signup and view all the answers

What is the primary purpose of a Multilevel Feedback Queue?

To improve system performance. Signup and view all the answers

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

A process is fixed to one queue. Signup and view all the answers

What is an advantage of using a Multilevel Feedback Queue?

It improves system responsiveness. Signup and view all the answers

Why is a Multilevel Feedback Queue used in operating systems?

To schedule processes efficiently. Signup and view all the answers

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

T Signup and view all the answers

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

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

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

To manage real-time threads Signup and view all the answers

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

Directly proportional Signup and view all the answers

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

0 Signup and view all the answers

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

Processor time is allocated based on the number of shares 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.

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.