Consider the three transactions T1, T2, and T3, and the schedules S1 and S2 given below. Transaction T1: r1(x); r1(z); w1(x) Transaction T2: r2(z); r2(y); w2(z); w2(y) Transaction T3: r3(x); r3(y); w3(y) Schedule S1: r1(x); r2(z); r1(x); r3(x); r3(y); w1(x); w3(y); r2(y); w2(z); w2(y) Schedule S2: r1(x); r2(z); r3(x); r1(z); r2(y); r3(y); w1(x); w2(z); w3(y); w2(y) Draw the serializability (precedence) for S1 and S2 and state whether each schedule is conflict serializable. Write down the equivalent serial schedule(s) if a schedule is serializable. PLEASE BE CLEAR IN ANSWER ...THANKS
Consider the three transactions T1, T2, and T3, and the schedules S1 and S2 given below. Transaction T1: r1(x); r1(z); w1(x) Transaction T2: r2(z); r2(y); w2(z); w2(y) Transaction T3: r3(x); r3(y); w3(y) Schedule S1: r1(x); r2(z); r1(x); r3(x); r3(y); w1(x); w3(y); r2(y); w2(z); w2(y) Schedule S2: r1(x); r2(z); r3(x); r1(z); r2(y); r3(y); w1(x); w2(z); w3(y); w2(y) Draw the serializability (precedence) for S1 and S2 and state whether each schedule is conflict serializable. Write down the equivalent serial schedule(s) if a schedule is serializable. PLEASE BE CLEAR IN ANSWER ...THANKS
Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter10: Transaction Management And Concurrency Control
Section: Chapter Questions
Problem 7P
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Consider the three transactions T1, T2, and T3, and the schedules S1 and S2 given below.
Transaction T1: r1(x); r1(z); w1(x)
Transaction T2: r2(z); r2(y); w2(z); w2(y)
Transaction T3: r3(x); r3(y); w3(y)
Schedule S1: r1(x); r2(z); r1(x); r3(x); r3(y); w1(x); w3(y); r2(y); w2(z); w2(y)
Schedule S2: r1(x); r2(z); r3(x); r1(z); r2(y); r3(y); w1(x); w2(z); w3(y); w2(y)
Draw the serializability (precedence) for S1 and S2 and state whether each schedule is conflict serializable. Write down the equivalent serial schedule(s) if a schedule is serializable.
PLEASE BE CLEAR IN ANSWER ...THANKS
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