Database Recovery System1. Consider the following sequence of 'logs' from transactions A, B, C and D. Representtransactions on the timeline and add logs to recovery. Complete the table and justifyyour answer.Redo PhaseUndo Phase| LogStart T1Read T1, D| CheckpointWrite T1, D, 20, 25Commit T1Start T2Read T2, BStart, T3Write T2, B, 12, 18Commit T2Read T3, DWrite T3, D, 25, 15System crash -

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ng sequence of 'logs' fror timeline and add logs to r

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

Database Recovery System
1. Consider the following sequence of 'logs' from transactions A, B, C and D. Represent
transactions on the timeline and add logs to recovery. Complete the table and justify
your answer.
Redo Phase
Undo Phase
| Log
Start T1
Read T1, D
| Checkpoint
Write T1, D, 20, 25
Commit T1
Start T2
Read T2, B
Start, T3
Write T2, B, 12, 18
Commit T2
Read T3, D
Write T3, D, 25, 15
System crash -

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