DATABASE SYSTEM CONCEPTS LCPO
DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 17, Problem 15E

Explanation of Solution

a.

Two possible executions:

Case 1:

 AB
Initially00
After T101
After T201

Consistency met: A=0 ∨ B=0

  T Ȣ...

Explanation of Solution

b.

Any interleaving of T1 and T2 results in a non-serializable schedule.

  Precedence graph

Explanation of Solution

c.

Explanation:

  • There is no parallel execution resulting in a serializable schedule.
  • From part a. it is known that a serializable schedule results in A = 0 ∨ B = 0.
  • Suppose if started with T1 read(A). Then when the schedule ends, no matter when run the steps of T2, B = 1...

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