Consider the database transactions listed below.T1T2T3a = read (x)b = read(y)c = read (z)write (x, a+1)write (x,b-1)write (z,c+2)commitcommitcommitAssume that the initial values of the persistent data items x, y, and z are the following.x = 1, y = 2, and z = 3.Show a sample concurrent execution of the transactions T1, T2, and T3 that is conflictserializable and that is NOT order-preserving conflict serializable.Prove, that the execution is conflict serializable and that it is NOT order-preserving conflictserializable.

Conflict serializable means that we can transform the serial schedule by swapping the…

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3. ple concurrent execution of the transactions T1, T2, and T3 that is confl

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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Concept explainers

Concurrency Control

The simultaneous occurrence of two or more operations is called concurrence and the situation is called concurrency. In concurrency, the function of one operation can affect the function of the other and put data integrity at risk. Hence, management for the control of concurrency is required. The management or controlling system in the Database Management System (DBMS) that coordinates concurrent access is called the concurrency control system.

Question

Consider the database transactions listed below.
T1
T2
T3
a = read (x)
b = read(y)
c = read (z)
write (x, a+1)
write (x,b-1)
write (z,c+2)
commit
commit
commit
Assume that the initial values of the persistent data items x, y, and z are the following.
x = 1, y = 2, and z = 3.
Show a sample concurrent execution of the transactions T1, T2, and T3 that is conflict
serializable and that is NOT order-preserving conflict serializable.
Prove, that the execution is conflict serializable and that it is NOT order-preserving conflict
serializable.

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