Consider the following two transactions:T34: read(A);read(B);if A = 0 then B := B + 1;write(B).T35: read(B);read(A);if B = 0 then A := A + 1;write(A).Add lock and unlock instructions to transactions T31 and T32 so that they observe the two-phase locking protocol. Can the execution of these transactionsresult in a deadlock?

The Lock and unlock instructions: T31: lock-S(A)read(A)lock-X(B)read(B)if A = 0then B := B +…

Answered: Consider the following two…

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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Consider the following two transactions:
T34: read(A);
read(B);
if A = 0 then B := B + 1;
write(B).
T35: read(B);
read(A);
if B = 0 then A := A + 1;
write(A).
Add lock and unlock instructions to transactions T₃₁ and T₃₂ so that they observe the two-phase locking protocol. Can the execution of these transactions
result in a deadlock?

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