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1 [Start, T1] 2 [Start, T2] 3 [T1, Bounce, 500, 1000] 4 [T2, Salary, 4000,4400] 5 [Checkpoint, Active={T1, T2}] 6 [T2, Bounce, 1000, 1500] 7 [Commit, T2] 8 [Start, T3] 9 [T1, Salary, 4400, 7000] 10[Checkpoint, Active={T1, T3}] 11[T3, Tax,300,500] 12[T3,EmpN,10,14] 13[Commit, T1] 14[Commit, T3] 15[Start, T8] 16[T8,Bounce, 1500,1550] 17[Start, T5] 16[Checkpoint, Active={T5, T8}] 17 [Start, T7] 18 [T7, abc,6,8] 19 [T5, MangN, 1,2] 20 [Commit,Ts] 21 [Start, T9] 22 [T9, MangN,2,3] 23 [Commit, T9] 24 [System Failure] Using Deferred Updates recovery scheme answer the following questions. Undone: There is no undo in Deferred recovery Redone: T1, T2, T3, T5, T9 What will be the values of Salary and Tax after recovering the system? Salary 7000 Tax 500 End -- MangN 3

1 [Start, T1] 2 [Start, T2] 3 [T1, Bounce, 500, 1000] 4 [T2, Salary, 4000,4400] 5 [Checkpoint, Active={T1, T2}] 6 [T2, Bounce, 1000, 1500] 7 [Commit, T2] 8 [Start, T3] 9 [T1, Salary, 4400, 7000] 10[Checkpoint, Active={T1, T3}] 11[T3, Tax,300,500] 12[T3,EmpN,10,14] 13[Commit, T1] 14[Commit, T3] 15[Start, T8] 16[T8,Bounce, 1500,1550] 17[Start, T5] 16[Checkpoint, Active={T5, T8}] 17 [Start, T7] 18 [T7, abc,6,8] 19 [T5, MangN, 1,2] 20 [Commit,Ts] 21 [Start, T9] 22 [T9, MangN,2,3] 23 [Commit, T9] 24 [System Failure] Using Deferred Updates recovery scheme answer the following questions. Undone: There is no undo in Deferred recovery Redone: T1, T2, T3, T5, T9 What will be the values of Salary and Tax after recovering the system? Salary 7000 Tax 500 End -- MangN 3

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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  1. Using Deferred Updates recovery scheme answer the following questions.

Which transactions will be undone, redone and What will be the values of Salary and Tax after recovering the system?

The blue is my answer and im not sure if i got right or not, please help

1 [Start, T1] 2 [Start, T₂] 3 [T1, Bounce, 500, 1000] 4 [T2, Salary, 4000,4400] 5 [Checkpoint, Active={T1, T2}] 6 [T2, Bounce, 1000, 1500] 7 [Commit, T₂] 8 [Start, T3] 9 [T1, Salary, 4400, 7000] 10[Checkpoint, Active={T1, T3}] 11[T3, Tax,300,500] 12[T3, EmpN,10,14] 13[Commit, T₁] 14[Commit, T3] 15[Start, T8] 16[T8,Bounce, 1500,1550] 17[Start, T5] 16[Checkpoint, Active={T5, T8}] 17 [Start, T7] 18 [T7, abc,6,8] 19 [T5, MangN, 1,2] 20 [Commit, T5] 21 [Start, T9] 22 [T9, MangN,2,3] 23 [Commit, T9] 24 [System Failure] Using Deferred Updates recovery scheme answer the following questions. Undone: There is no undo in Deferred recovery Redone: T1, T2, T3, T5, T9 What will be the values of Salary and Tax after recovering the system? Salary 7000 Tax 500 End -- MangN 3
Transcribed Image Text:1 [Start, T1] 2 [Start, T₂] 3 [T1, Bounce, 500, 1000] 4 [T2, Salary, 4000,4400] 5 [Checkpoint, Active={T1, T2}] 6 [T2, Bounce, 1000, 1500] 7 [Commit, T₂] 8 [Start, T3] 9 [T1, Salary, 4400, 7000] 10[Checkpoint, Active={T1, T3}] 11[T3, Tax,300,500] 12[T3, EmpN,10,14] 13[Commit, T₁] 14[Commit, T3] 15[Start, T8] 16[T8,Bounce, 1500,1550] 17[Start, T5] 16[Checkpoint, Active={T5, T8}] 17 [Start, T7] 18 [T7, abc,6,8] 19 [T5, MangN, 1,2] 20 [Commit, T5] 21 [Start, T9] 22 [T9, MangN,2,3] 23 [Commit, T9] 24 [System Failure] Using Deferred Updates recovery scheme answer the following questions. Undone: There is no undo in Deferred recovery Redone: T1, T2, T3, T5, T9 What will be the values of Salary and Tax after recovering the system? Salary 7000 Tax 500 End -- MangN 3
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