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Consider the following histories. Draw their serialization graphs and identify wh one of them is serializable. Provide reason for your explanation. i. H1= r1(Y), w1(X), r3(Y), w2(Y), r1(Z), w1(Z), w3(X), w2(X) ii. H2 = r1(X), r2(X), w1(X), w2(X), w1(Y), r2(Y), r3(Z)

Consider the following histories. Draw their serialization graphs and identify wh one of them is serializable. Provide reason for your explanation. i. H1= r1(Y), w1(X), r3(Y), w2(Y), r1(Z), w1(Z), w3(X), w2(X) ii. H2 = r1(X), r2(X), w1(X), w2(X), w1(Y), r2(Y), r3(Z)

Database System Concepts
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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Serialization graph.

Consider the following histories. Draw their serialization graphs and identify which one of them is serializable. Provide reason for your explanation. i. H1= r1(Y), w1(X), r3(Y), w2(Y), r1(Z), w1(Z), w3(X), w2(X) ii. Н2 %3Dr1(X), r2(Х), wi(X), w2(X), wi(Y), r2(Y), r3(Z) iii. Н3 3 г2(Ү), r2(Х), г3(X), г3(Ү), w2(Y), г3(Z), w3(Z), r2(Z), w1(X), r3(Z) iv. H4 = r1(Y), r2(Z), r1(Z), r3(X), r2(Y), w1(X), w2(Y), r2(Y), w2(Z), w2(Y)
Transcribed Image Text:Consider the following histories. Draw their serialization graphs and identify which one of them is serializable. Provide reason for your explanation. i. H1= r1(Y), w1(X), r3(Y), w2(Y), r1(Z), w1(Z), w3(X), w2(X) ii. Н2 %3Dr1(X), r2(Х), wi(X), w2(X), wi(Y), r2(Y), r3(Z) iii. Н3 3 г2(Ү), r2(Х), г3(X), г3(Ү), w2(Y), г3(Z), w3(Z), r2(Z), w1(X), r3(Z) iv. H4 = r1(Y), r2(Z), r1(Z), r3(X), r2(Y), w1(X), w2(Y), r2(Y), w2(Z), w2(Y)
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