Given the system logs in the table below that shows the operations of four transactions T1, T2, T3 and T4. a) What is the purpose of using checkpoint? b) In case of recovery using deferred update, which transactions will be undone? which transactions will be redone? which transactions will be ignored? In your answer, you need to discuss the status of all transactions T1, T2, T3 and T4 and to explain why. System logs [start transaction, T1] [write transaction, T1, D, 20] [commit, T1] [Checkpoint] [start transaction, T2] [write transaction, T2, C, 50] [write transaction, T2, A, 10] [commit, T2] [start transaction, T3] [write transaction, T3, B, 10] [start transaction, T4] [write transaction, T4, D, 10] system crash sequence of

Given the system logs in the table below that shows the operations of four transactions T1, T2, T3 and T4. a) What is the purpose of using checkpoint? b) In case of recovery using deferred update, which transactions will be undone? which transactions will be redone? which transactions will be ignored? In your answer, you need to discuss the status of all transactions T1, T2, T3 and T4 and to explain why. System logs [start transaction, T1] [write transaction, T1, D, 20] [commit, T1] [Checkpoint] [start transaction, T2] [write transaction, T2, C, 50] [write transaction, T2, A, 10] [commit, T2] [start transaction, T3] [write transaction, T3, B, 10] [start transaction, T4] [write transaction, T4, D, 10] system crash sequence of

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Hello
I hope to answer my question and don't use your handwriting, please
Thank you

please check the attached image..

Given the system logs in the table below that shows the sequence of
operations of four transactions T1, T2, T3 and T4.
a) What is the purpose of using checkpoint?
b) In case of recovery using deferred update, which transactions will
be undone? which transactions will be redone? which transactions
will be ignored? In your answer, you need to discuss the status of
all transactions T1, T2, T3 and T4 and to explain why.
+
System logs
[start transaction, T1]
[write transaction, T1, D, 20]
[commit, T1]
[Checkpoint]
[start transaction, T2]
[write transaction, T2, C, 50]
[write transaction, T2, A, 10]
[commit, T2]
[start transaction, T3]
[write transaction, T3, B, 10]
[start transaction, T4]
[write transaction, T4, D, 10]
system crash

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