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Question 7: Rule Priority
In identification rules, if there is one rule with a Priority of 100 and another with a Priority of 200, which is the correct behavior?
- A. The rule with Priority 200 is evaluated first.
- B. Both rules are evaluated simultaneously.
- C. The rule with Priority 100 is evaluated first, and if a match is found, the process terminates.
- D. The rule with the highest number of matches is adopted.
【Correct Answer】 C. The rule with Priority 100 is evaluated first, and if a match is found, the process terminates.
【Detailed Explanation】
In ServiceNow’s Identification Rules, the numeric Priority value is used to control which attributes are prioritized to uniquely identify a CI.
- Evaluation Order: The lower the number, the higher the priority. Therefore, the rule with Priority 100 is evaluated before the rule with Priority 200.
- Process Termination (Short-circuiting): The IRE evaluates rules in order of priority. As soon as it finds a “match” with an existing CI, it stops the evaluation. Subsequent rules with lower priority (e.g., 200) will not be evaluated.
- When no match is found: Only if no match is found using the Priority 100 rule does the engine proceed to the next priority level (e.g., the rule with Priority 200). If no match is found after checking all defined rules, the IRE treats the data as a new entry and creates a new CI (Insert).
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