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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Question

Consider the following two transactions:
T₁₃: read(A);
read(B);
if A = 0 then B := B + 1;
write(B).
T₁₄: read(B);
read(A);
if B = 0 then A := A + 1;
write(A). Let the consistency requirement be A = 0 ∨ B = 0, with A = B = 0 as
the initial values.
a. Show that every serial execution involving these two transactions preserves the consistency of the database.
b. Show a concurrent execution of T₁₃ and T₁₄ that produces a nonserializable schedule.
c. Is there a concurrent execution of T₁₃ and T₁₄ that produces a serializable schedule?

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