An actual update is not allowed to a data item ____________...

MCQ

An actual update is not allowed to a data item ____________

before the corresponding log record is written out to stable storage

after the corresponding log record is written out to stable storage

until the whole log record has been checked for inconsistencies

all of the mentioned

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MCQ

The growing phase is a phase in which?

A transaction may obtain locks, but does not release any

A transaction may obtain locks, and releases a few or all of them

A transaction may release locks, but does not obtain any new locks

A transaction may release locks, and does obtain new locks

Discussion

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What is a mutex?

is a binary mutex

must be accessed from only one process

can be accessed from multiple processes

none of the mentioned

Discussion

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What is a reusable resource?

that can be used by one process at a time and is not depleted by that use

that can be used by more than one process at a time

that can be shared between various threads

none of the mentioned

Discussion

MCQ

Consider a transaction T1 that committed prior to checkpoint. The record appears in the log before the record. Any modifications made by T1 must have been written to the stable storage either with the checkpoint or prior to it. Thus at recovery time ____________

There is a need to perform an undo operation on T1

There is a need to perform a redo operation on T1

There is no need to perform an undo and redo operation on T1

All of the mentioned

Discussion

MCQ

Consider the methods used by processes P1 and P2 for accessing their critical sections whenever needed, as given below. The initial values of shared boolean variables S1 and S2 are randomly assigned.

Method used by P1 :
while(S1==S2);
Critical section
S1 = S2;
 
Method used by P2 :
while(S1!=S2);
Critical section
S2 = not(S1);

Which of the following statements describes properties achieved?

Mutual exclusion but not progress

Progress but not mutual exclusion

Neither mutual exclusion nor progress

Both mutual exclusion and progress

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category More Operating System Topics

Introduction to Operating System

Types

Services

Structures

Processes

Threads

CPU Scheduling

Process Synchronization

Memory Management

Storage Management

Input Output Systems

Networking

Distributed Operating System

Protection and Security

Unix

Linux

MS Windows

Mixed

Operating Systems Overview

Process Management

Finding and Processing Files

File Management

Report Error

Community Discussion

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Report Error

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