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2. Chapter 9Concurrency Control. T1T2?Tn. DB(consistencyconstraints). . . . 3. Example:. T1:Read(A)T2:Read(A)A ? A 100A ? A?2Write(A)Write(A)Read(B)Read(B)B ? B 100B ?B?2Write(B)Write(B)Constraint: A=B. 4. Serial Schedule A (?good\" by definition). T1

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