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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I found this question in one book, Im not able to solve it, help me
Transactions:
The following transaction schedule is given. A,B,C are the addresses of the records
in the database and T1, T2 and T3 are the transactions.
T1
R(A)W(A)
R(C)
R(B)W(B)C
T2
T3
R(B)
W(B)
R(C)
R(B)W(B)
R(A)
a) Show an example of a strict 2PL implementation that leads to a deadlock
b) For a) draw a >>wait-for<< graph
c) Avoid the previously drawn deadlock with a >>wait-die<< policy
d) Give an example of another schedule that would be conflict-equivalent to the
given schedule of transactions
с
W(A)C
Transcribed Image Text:Transactions: The following transaction schedule is given. A,B,C are the addresses of the records in the database and T1, T2 and T3 are the transactions. T1 R(A)W(A) R(C) R(B)W(B)C T2 T3 R(B) W(B) R(C) R(B)W(B) R(A) a) Show an example of a strict 2PL implementation that leads to a deadlock b) For a) draw a >>wait-for<< graph c) Avoid the previously drawn deadlock with a >>wait-die<< policy d) Give an example of another schedule that would be conflict-equivalent to the given schedule of transactions с W(A)C
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