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Answer :
The provided log records are processed to determine the values of X, Y, Z, and the Undo-List at each step, reflecting the actions taken during the outage and subsequent updates.
The log records indicate certain actions taken during the outage. Based on each log record, we can determine the impact on the variables X, Y, Z, and the Undo-List.
The log records update the values of X, Y, and Z at different steps. For example, log record 2 updates X to 250, log record 3 updates Y to 50, and log record 4 updates Z to 6.
The Undo-List is a list of previous values that can be used to reverse the effects of certain actions. The Undo-List is updated accordingly. For example, log record 2 adds the value 5 to the Undo-List.
As new log records are encountered and processed, the values of X, Y, Z, and the Undo-List will be updated accordingly based on the actions specified in each log record.
Based on the provided log records, the values of X, Y, Z, and the Undo-List can be determined as follows:
Step 1: No impact on X, Y, Z, or Undo-List.
Beginning of Log: No impact on X, Y, Z, or Undo-List.
2: X = 250, Y = 3, Z = 4, Undo-List = {5}
3: Y = 50
4: Z = 6
5: No impact on X, Y, Z, or Undo-List.
6: X = 200
7: Y = 7
8: Z = 8
9: No impact on X, Y, Z, or Undo-List.
10: X = 400
11: Y = 9
12: Z = 100
13: No impact on X, Y, Z, or Undo-List.
14: X = 500
15: Y = 11
16: Z = 12
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