Use 2PL to provide solutions for the following transactions. a. Explain what the problem is in the table above! What types of problems are included? b. Make a solution with 2PL. How much should the Sum be?

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Use 2PL to provide solutions for the following transactions.

a. Explain what the problem is in the table above! What types of problems are included?
b. Make a solution with 2PL. How much should the Sum be?

T1
T2
T3
Bal_x
Bal_y
Sum
t1
begin_tran
150
75
t2
begin_tran
read(Bal_x)
Bal x = Bal x - 25
Sum = 0
150
75
begin_tran
read(Bal_y)
Bal_y = Bal_y +
t3
read(Bal_x)
Sum = Sum + Bal x
150
75
t4
150
75
150
read(Bal_y)
Sum = Sum + Bal y
t5
write(Bal_x)
20
125
75
150
t6
commit
write(Bal_y)
125
95
225
t7
commit
commit
125
95
225
Transcribed Image Text:T1 T2 T3 Bal_x Bal_y Sum t1 begin_tran 150 75 t2 begin_tran read(Bal_x) Bal x = Bal x - 25 Sum = 0 150 75 begin_tran read(Bal_y) Bal_y = Bal_y + t3 read(Bal_x) Sum = Sum + Bal x 150 75 t4 150 75 150 read(Bal_y) Sum = Sum + Bal y t5 write(Bal_x) 20 125 75 150 t6 commit write(Bal_y) 125 95 225 t7 commit commit 125 95 225
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