3i Infotech Placement: Sample Questions 827 - 828 of 1245

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Question 827

Question

MCQ▾

Windows supports

Choices

Choice (4)

a.

n tasks

b.

Multi user

c.

Question does not provide sufficient data or is vague

d.

All of the above

Answer

b.

Explanation

Understanding of Multi-User
  • A multi-user operating system allows multiple users to access a computer system concurrently.
  • Time sharing system is a multi-user system as it enables multi user access to a computer through the sharing of time
  • The users will typically be at terminals or computers that give them access to the system through a network, as well as other machines on the system such as printers

Question 828

Edit

Describe in Detail

Essay▾

What is Transaction Manager?

Explanation

  • Part of an application that controls the coordination of transactions over one or more resources.
  • Maintains a log in storage on disk.
  • Records transaction starts, enlistments, and commits decisions in the log.
  • Reads log when it restarts to reconstruct the most recent state, using the log to make its state durable, when if the transaction manager fails,

Responsibility

  • Demarcation
    • Starting and finishing transactions by means of begin, commit and rollback methods.
  • Controlling the Transaction Context:
    • Transaction contexts contain all the information that helps a transaction manager to monitor a transaction.
    • Transaction managers are in charge of building transaction contexts and connecting them to the existing thread.
  • Coordinating the Transaction:
    • Transaction managers generally have the ability to harmonize a transaction over various resources. This feature demands the two-phase commit protocol.
  • Recovery From Failure:
    • Transaction managers are accountable to guarantee that the resources are not kept in an inconsistent state in case of a system or application failure.

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