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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? a. Deferred Update b. 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? a. Deferred Update b. 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
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Based on the following System log at time of system crash, answer the questions that follows:

 

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

a. Deferred Update

b. Immediate update (Undo/Redo)

and 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? a. Deferred Update b. Immediate update (Undo/Redo)
Transcribed Image Text:and 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? a. Deferred Update b. Immediate update (Undo/Redo)
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