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Based on the following System log at time of system crash, answer the questions that follows: [checkpoint]                    System Crash    What are the recovery actions in each of the following recovery techniques? Deferred Update Immediate update (Undo/Redo)

Based on the following System log at time of system crash, answer the questions that follows: [checkpoint]                    System Crash    What are the recovery actions in each of the following recovery techniques? Deferred Update Immediate update (Undo/Redo)

Database System Concepts
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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Based on the following System log at time of system crash, answer the questions that follows:

<start_transaction, T1>

<write_item, T1, B, 100, 200>

<commit, T1>

[checkpoint]

<start_transaction, T2>

<write_item, T2, C, 1500, 250>

<commit, T2>

<start_transaction, T3>

<write_item, T3, B, 200, 300>

<start_transaction, T4>

<write_item, T4, C, 1500, 250>

<write_item, T3, A, 500, 1000>

 

 

 

 

 

 

 

     System Crash

  

What are the recovery actions in each of the following recovery techniques?

  1. Deferred Update
  1. Immediate update (Undo/Redo)
<start transaction, T1> <write item, T1, B, 100, 200> <commit, T1> [checkpoint] <start transaction, T2> <write item, T2, C, 1500, 250> <commit, T2> <start transaction, T3> <write item, T3, B, 200, 300> <start transaction, T4> <write item, T4, C, 1500, 250> <write item, T3, A, 500, 1000> System Crash
Transcribed Image Text:<start transaction, T1> <write item, T1, B, 100, 200> <commit, T1> [checkpoint] <start transaction, T2> <write item, T2, C, 1500, 250> <commit, T2> <start transaction, T3> <write item, T3, B, 200, 300> <start transaction, T4> <write item, T4, C, 1500, 250> <write item, T3, A, 500, 1000> System Crash
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