Question: Databases System. The complete book. Exercise 17.2.4. The following is a sequence of undo-log records written by two transactions T and U : < START

Databases System. The complete book. Exercise 17.2.4. The following is a sequence of undo-log 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>

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