Daella, Paula Angelica Teng, Grizelda L.. Show the log file entries (using immediate DB update with checkpoints) that would be generated by this execution.

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Presentation transcript:

Daella, Paula Angelica Teng, Grizelda L.

Show the log file entries (using immediate DB update with checkpoints) that would be generated by this execution. For each log entry, indicate what line number generates it.

If the system crashes immediately after line 7, using immediate DB update with checkpoints, what transactions need to be undone and redone (assume log records up to this point are recorded on disk) T1 -undo T3 - redo

If the system crashes immediately after line 18, using immediate DB update with checkpoints, what transactions need to be undone and redone (assume log records up to this point are recorded on disk) T3 - ignore T2 - ignore T1 - undo