Computers and Technology, 31.05.2021 18:40 yasarhan2
Consider the following schedule. Explain what happens when transactions try to execute as per this schedule and the DBMS uses timestamp-based
concurrency control. We use ST to denote the start of a transaction, C for commit,
and A for abort.
ST1 β ST2 β ST3 β ST4 β R2(X) β R1(X) β W2(X) β W4(X) β W1(X) β
C1 β W3(X β A4 β R2(Y ) β W2(Y ) β R3(Y ) β C2 β W3(Y ) β C3
(Fill in the table below showing what happens as the transactions execute):
T1 T2 T3 T4 X Y
1 2 3 4 RT = 0 RT = 0
WT = 0 WT = 0
C = true C = true
R2(X)
Consider the following schedule. Explain what happens when transactions try to execute as per this schedule and the DBMS uses multiversion concurrency control:
ST1 β ST2 β ST3 β ST4 β R1(X) β R3(X) β W3(X) β R2(X) β R4(X) β
W2(X) β W4(X)
(Fill in the table below showing what happens as the transactions execute):
T1 T2 T3 T4 X0 . . .
1 2 3 4
R1(X) RT = 1
Answers: 2
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Consider the following schedule. Explain what happens when transactions try to execute as per this s...
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