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Consider the following sequence of 'logs' from transactions T1, T2, T3 and T4. Represent transactions on the timeline as follows: Checkpoint FAILURE D Append logs in recovery. Justify the answer. Start T1 Read T1, A Read T1, D Write T1, D, 20, 25 Commit T1 Checkpoint Start T2 Read T2, B Write T2, B, 12, 18 Start, T4 Read T4, D Write T4, D, 25, 15 Start T3 Write T3, C, 30, 40 Read T4, A Write T4, A, 30, 20 Commit T4 Read T2, D Write T2, D, 15, 25 System crash <<-----

Consider the following sequence of 'logs' from transactions T1, T2, T3 and T4. Represent transactions on the timeline as follows: Checkpoint FAILURE D Append logs in recovery. Justify the answer. Start T1 Read T1, A Read T1, D Write T1, D, 20, 25 Commit T1 Checkpoint Start T2 Read T2, B Write T2, B, 12, 18 Start, T4 Read T4, D Write T4, D, 25, 15 Start T3 Write T3, C, 30, 40 Read T4, A Write T4, A, 30, 20 Commit T4 Read T2, D Write T2, D, 15, 25 System crash <<-----

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Recovery System Consider the following sequence of 'logs' from transactions T1, T2, T3 and T4. Represent transactions on the timeline as follows: Checkpoint FAILURE B D Append logs in recovery. Justify the answer. Start T1 Read T1, A Read T1, D Write T1, D, 20, 25 Commit T1 Checkpoint Start T2 Read T2, B Write T2, B, 12, 18 Start, T4 Read T4, D Write T4, D, 25, 15 Start T3 Write T3, C, 30, 40 Read T4, A Write T4, A, 30, 20 Commit T4 Read T2, D Write T2, D, 15, 25 System crash <----- For this purpose use a table as follows: Log Redo Phase Undo Phase
Transcribed Image Text:Recovery System Consider the following sequence of 'logs' from transactions T1, T2, T3 and T4. Represent transactions on the timeline as follows: Checkpoint FAILURE B D Append logs in recovery. Justify the answer. Start T1 Read T1, A Read T1, D Write T1, D, 20, 25 Commit T1 Checkpoint Start T2 Read T2, B Write T2, B, 12, 18 Start, T4 Read T4, D Write T4, D, 25, 15 Start T3 Write T3, C, 30, 40 Read T4, A Write T4, A, 30, 20 Commit T4 Read T2, D Write T2, D, 15, 25 System crash <----- For this purpose use a table as follows: Log Redo Phase Undo Phase
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