Question 280 of 520

Database Administration and CMDB →mediumMultiple SelectObjective-mapped

Resolving and Preventing Duplicate CIs — Identification Rules and Reconciliation | ServiceNow CSA Explained

This SNOW-CSA practice question tests your understanding of database administration and cmdb. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A ServiceNow administrator notices that the CMDB contains duplicate CI records for the same server. The duplicates were created by different discovery sources. Which TWO actions should the administrator take to resolve this issue and prevent future duplicates? (Choose two.)

A
Use the 'Reconcile' operation in the CMDB Workspace to manually merge the duplicates.
The Reconcile operation allows administrators to manually merge duplicate CI records, resolving the immediate issue.
B
Run the 'Remove Duplicate CIs' scheduled job with the 'Delete' flag enabled.
Why wrong: There is no standard 'Remove Duplicate CIs' job; automatic deletion is risky and not best practice.
C
Set the 'Identification Engine' to automatically merge duplicate CIs based on serial number.
Why wrong: The Identification Engine uses rules to reconcile, but does not have an auto-merge setting. This option is not specific enough.
D
Update the discovery source rules to exclude the duplicate server from future discovery.
Why wrong: This only stops further data from that source but does not resolve existing duplicates.
E
Configure the CI Class Manager to require a unique combination of serial number and model ID.
Setting unique fields in CI Class Manager enforces uniqueness, preventing future duplicates.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Use the 'Reconcile' operation in the CMDB Workspace to manually merge the duplicates.

Option A is correct because the 'Reconcile' operation in the CMDB Workspace allows an administrator to manually review and merge duplicate CI records, which is necessary when duplicates are created by different discovery sources and automatic rules cannot resolve the conflict. This action directly resolves the existing duplicate records by consolidating them into a single authoritative CI.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Use the 'Reconcile' operation in the CMDB Workspace to manually merge the duplicates.
Why this is correct
The Reconcile operation allows administrators to manually merge duplicate CI records, resolving the immediate issue.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run the 'Remove Duplicate CIs' scheduled job with the 'Delete' flag enabled.
Why it's wrong here
There is no standard 'Remove Duplicate CIs' job; automatic deletion is risky and not best practice.
✗
Set the 'Identification Engine' to automatically merge duplicate CIs based on serial number.
Why it's wrong here
The Identification Engine uses rules to reconcile, but does not have an auto-merge setting. This option is not specific enough.
✗
Update the discovery source rules to exclude the duplicate server from future discovery.
Why it's wrong here
This only stops further data from that source but does not resolve existing duplicates.
✓
Configure the CI Class Manager to require a unique combination of serial number and model ID.
Why this is correct
Setting unique fields in CI Class Manager enforces uniqueness, preventing future duplicates.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse the 'Remove Duplicate CIs' scheduled job (which deletes duplicates automatically) with the 'Reconcile' operation (which merges them manually), leading to the misconception that automatic deletion is a safe and complete solution when it can cause data loss.

Detailed technical explanation

How to think about this question

The CMDB Reconciliation operation in the CMDB Workspace provides a manual, controlled method to merge duplicate CIs by selecting a 'surviving' record and merging attributes from the duplicate into it, preserving audit history and relationships. Under the hood, the Identification Engine uses identification rules (e.g., based on serial number, model ID, or other attributes) to match incoming CIs during discovery, but if rules are not properly configured or if discovery sources use different identifiers, duplicates can still occur. In a real-world scenario, an organization might have a server discovered by both a network scan (using IP address) and a cloud API (using instance ID), leading to two CIs that need manual reconciliation to ensure a single source of truth.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the SNOW-CSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this SNOW-CSA question test?

Database Administration and CMDB — This question tests Database Administration and CMDB — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use the 'Reconcile' operation in the CMDB Workspace to manually merge the duplicates. — Option A is correct because the 'Reconcile' operation in the CMDB Workspace allows an administrator to manually review and merge duplicate CI records, which is necessary when duplicates are created by different discovery sources and automatic rules cannot resolve the conflict. This action directly resolves the existing duplicate records by consolidating them into a single authoritative CI.

What should I do if I get this SNOW-CSA question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

2 more ways this is tested on SNOW-CSA

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. During a CMDB health review, an administrator finds that many CI records have the same serial number but different names and IP addresses. What is the most likely root cause?

hard

A.The CMDB has a scheduled job that deletes old CIs.
B.The CI class has a unique constraint on the name field.
✓ C.The identification rule for the CI class does not include the serial number.
D.The reconciliation rule is set to 'Create' instead of 'Update'.

Why C: The correct answer is C because the identification rule determines which fields are used to uniquely identify a CI. If the serial number is not included in the identification rule, the CMDB cannot detect duplicates based on serial number, allowing multiple CIs with the same serial number but different names and IP addresses to be created. This is a common misconfiguration that leads to CI proliferation and data inconsistency.

Variation 2. An administrator is troubleshooting issues with the CMDB identification and reconciliation engine. Which three components are part of the identification and reconciliation process? (Choose three.)

medium

A.Transform maps
✓ B.Reconciliation rules
✓ C.Data source
✓ D.Identification rules
E.CI Class Manager

Why B: Reconciliation rules (B) are a core component of the CMDB identification and reconciliation process because they define how to handle duplicate or conflicting CIs during the reconciliation phase. These rules determine which data source takes precedence, whether to merge or overwrite attributes, and how to resolve conflicts between multiple sources. Without reconciliation rules, the system cannot maintain a single authoritative view of each CI.

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