Databases System The complete book Exercise 17 3 3 The following is a sequence of redo logging records written by two transactions T and U START T START U T ,E , 50 The question Describe the action of the recovery manager, including changes to both disk and the log, if there is a crash and the last log record to appear on disk is (a) START U (b) (c) T ,E , 50 (d) Note to the Expert Please follow the specific instructions provided, please do not answer anything if you are not sure of your complete answer Otherwise, I will fail the class and I cannot afford it again Please write in understandable English Thank you so very much please do not forget part b

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Question: Databases System. The complete book. Exercise 17.3.3. The following is a sequence of redo logging records written by two transactions T and U : <

Databases System. The complete book. Exercise 17.3.3. The following is a sequence of redo logging records written by two transactions T and U:

< START T>; 10>; < START U>; 20>; 30>; 40>; U>; < T ,E , 50>; T>

The question: Describe the action of the recovery manager, including changes to both disk and the log, if there is a crash and the last log record to appear on disk is:

(a) < START U> (b) U> (c) < T ,E , 50> (d) T>

[ Note to the Expert: Please follow the specific instructions provided, please do not answer anything if you are not sure of your complete answer. Otherwise, I will fail the class and I cannot afford it again. Please write in understandable English. Thank you so very much. ]

please do not forget part b U>

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