Operating System Process Management

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Questions and Answers

What is a limitation of a single central processing unit (CPU)?

It can execute multiple processes simultaneously

It can only execute commands in sequence

It can only execute processes with identical commands

It can only execute one process at a time (correct)

What is a characteristic of multiprogramming operating systems?

They suspend all processes before executing the next one

They execute some commands from one process, then switch to another (correct)

They execute only one process at a time

They execute all processes simultaneously

How do multiprogramming operating systems handle multiple processes?

They prioritize one process over the others

They execute some commands from each process in a sequence (correct)

They execute each process simultaneously

They suspend all other processes when one is executing

Why do multiprogramming operating systems suspend a process?

To execute commands from another process Signup and view all the answers

What is the benefits of multiprogramming operating systems?

To improve system performance by executing multiple processes Signup and view all the answers

What happens to a transaction in the first case?

It is committed Signup and view all the answers

What is the opposite of a committed transaction?

An aborted transaction Signup and view all the answers

What is the main topic of discussion on Slide 1-24?

Why Recovery Is Needed Signup and view all the answers

What is a type of failure?

All of these Signup and view all the answers

What is the relationship between recovery and failure?

Recovery is needed because of failures Signup and view all the answers

Which property of transactions ensures that database transactions are executed to completion?

Atomicity Signup and view all the answers

What is the primary objective of the atomicity property in database transactions?

To guarantee full execution of transactions Signup and view all the answers

Which of the following is ensured by the atomicity property of transactions?

Either all changes are made or none are made Signup and view all the answers

What happens to a transaction if atomicity is enforced?

The transaction is fully executed or rolled back Signup and view all the answers

What is the consequence of atomicity in database transactions?

Transactions are treated as a single unit of work Signup and view all the answers

What is a requirement for a committed transaction in a database?

Changes are persisted in the database Signup and view all the answers

What happens to the changes made by a committed transaction in case of a failure?

They are persisted in the database despite the failure Signup and view all the answers

What is the purpose of a committed transaction in a database?

To ensure changes are persisted in the database Signup and view all the answers

Why are committed transactions important in a database?

To ensure data consistency and integrity Signup and view all the answers

What happens if a committed transaction is lost due to a failure?

The database is inconsistent and unreliable Signup and view all the answers

What type of failure occurs when a system or component suddenly stops functioning, causing widespread damage or disruption?

Catastrophic failure Signup and view all the answers

What operation is responsible for retrieving data from a database?

Read_item Signup and view all the answers

What is the primary function of the write_item operation in a database?

To add or modify data in the database Signup and view all the answers

What is the term for a failure that occurs gradually over time, rather than suddenly?

Gradual failure Signup and view all the answers

What is the relationship between the read_item and write_item operations in a database?

They are complementary Signup and view all the answers

Study Notes

Processing and Executing Transactions

A single CPU can only execute one process at a time, but multiprogramming operating systems can execute commands from multiple processes by suspending and resuming them.

Transaction Properties

Atomicity requires that a transaction is executed to completion, and changes to the database must persist even in the event of a failure.

Types of Failures

Catastrophic failure: a type of failure that can cause data loss or corruption.

Database Operations

Read_item operation: reads data from the database.
Write_item operation: writes data to the database.

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Description

Learn about how multiprogramming operating systems manage processes, executing commands from one process and then suspending it to execute commands from the next. Understand the basics of process management in OS.