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1 [Start, Ti] 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] I. 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? Redone: Undone: Salary Tax MangN

1 [Start, Ti] 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] I. 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? Redone: Undone: Salary Tax MangN

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? ( picture bellow )

 

 

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. Which transactions will be undone, redone and What will be the values of Salary and Tax after recovering the system? I. Redone: Undone: Salary Tax MangN www.tiesa
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. Which transactions will be undone, redone and What will be the values of Salary and Tax after recovering the system? I. Redone: Undone: Salary Tax MangN www.tiesa
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