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Consider the log in Figure below. Suppose there is a crash just before the < T0 abort> log record is written out. Explain what would happen during recovery. Describe the redo and undo phase of the recovery algorithm and the log records to be added during recovery

Consider the log in Figure below. Suppose there is a crash just before the < T0 abort> log record is written out. Explain what would happen during recovery. Describe the redo and undo phase of the recovery algorithm and the log records to be added during recovery

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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Consider the log in Figure below. Suppose there is a crash just before the < T0 abort> log
record is written out. Explain what would happen during recovery. Describe the redo and undo
phase of the recovery algorithm and the log records to be added during recovery

Start log records found for all Beginning of log <To start> <To, B, 2000, 2050> <T; start> <checkpoint {To. T:}> <T, C, 700, 600> older transactions in undo list To rollback (during normal operation) begins Redo Pass <T; commit> <T2 start> <Ta A, 500, 400> <To, B, 2000> To abort> End of log at crash! To rollback complete Tz is incomplete Undo list: T2 Undo Pass Log records added during at crash <Ta A, 500> <Tz abort> T2 rolled back in undo pass recovery newer Figure 16.5 Example of logged actions, and actions during recovery.
Transcribed Image Text:Start log records found for all Beginning of log <To start> <To, B, 2000, 2050> <T; start> <checkpoint {To. T:}> <T, C, 700, 600> older transactions in undo list To rollback (during normal operation) begins Redo Pass <T; commit> <T2 start> <Ta A, 500, 400> <To, B, 2000> To abort> End of log at crash! To rollback complete Tz is incomplete Undo list: T2 Undo Pass Log records added during at crash <Ta A, 500> <Tz abort> T2 rolled back in undo pass recovery newer Figure 16.5 Example of logged actions, and actions during recovery.
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