The answer is serial number, as it is the highest priority attribute to populate first in a CMDB health report for the cmdb_ci_server class. This is correct because the health report reveals that serial_number has the lowest population percentage—often around 45%—making it the most critical gap to address for data quality. Serial numbers are foundational for uniquely identifying hardware assets, enabling warranty validation, and ensuring accurate integration with external asset management systems; without them, duplicate or orphaned records proliferate, undermining the entire CMDB. On the ServiceNow Certified System Administrator CSA exam, this question tests your ability to interpret a CMDB health report exhibit and prioritize attributes based on population percentages, not just technical importance. A common trap is choosing an attribute like “name” or “manufacturer” because they seem obvious, but the exam emphasizes that the lowest-populated attribute is the highest priority. Memory tip: think “S for Serial, S for Start”—populate the serial number first to secure your CMDB foundation.
SNOW-CSA Database Administration and CMDB Practice Question
This SNOW-CSA practice question tests your understanding of database administration and cmdb. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
Exhibit:
```
CMDB Query: sys_class_name: cmdb_ci_server
Number of CIs: 2500
Number of CIs with missing serial_number: 800
Number of CIs with missing os: 300
Number of CIs with missing manufacturer: 150
Number of CIs with missing model_id: 200
Number of CIs with missing ip_address: 50
```
An administrator runs a CMDB health report for the CI class cmdb_ci_server and sees the exhibit. Which attribute is the highest priority to populate first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Refer to the exhibit.
Exhibit:
```
CMDB Query: sys_class_name: cmdb_ci_server
Number of CIs: 2500
Number of CIs with missing serial_number: 800
Number of CIs with missing os: 300
Number of CIs with missing manufacturer: 150
Number of CIs with missing model_id: 200
Number of CIs with missing ip_address: 50
```
A
Operating system (os)
Why wrong: 300 missing, which is less than serial_number.
B
Serial number (serial_number)
800 missing, the highest number, and critical for identification.
C
Model ID (model_id)
Why wrong: 200 missing, which is less than serial_number.
D
Manufacturer
Why wrong: 150 missing, which is less than serial_number.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Serial number (serial_number)
The CMDB health report shows that the serial_number attribute has the lowest population percentage (e.g., 45%) compared to other attributes. Serial numbers are critical for hardware asset identification, warranty validation, and integration with external asset management systems. Populating serial_number first ensures accurate CI identification and reduces duplicate or orphaned records, which is a foundational step in CMDB data quality.
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.
✗
Operating system (os)
Why it's wrong here
300 missing, which is less than serial_number.
✓
Serial number (serial_number)
Why this is correct
800 missing, the highest number, and critical for identification.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Model ID (model_id)
Why it's wrong here
200 missing, which is less than serial_number.
✗
Manufacturer
Why it's wrong here
150 missing, which is less than serial_number.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often prioritize attributes like operating system or manufacturer because they seem more relevant to server operations, but the CMDB health report specifically highlights population gaps, and serial_number is the most critical for unique CI identification and deduplication.
Detailed technical explanation
How to think about this question
In ServiceNow CMDB, the serial_number attribute is often used as a deduplication key in identification and reconciliation rules (e.g., using the IRE). Without a unique serial number, the system may create duplicate CIs for the same physical server, leading to inaccurate configuration data and broken relationships. Real-world scenarios include hardware refresh cycles where serial numbers are essential for tracking assets across procurement, deployment, and retirement stages.
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.
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.
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: Serial number (serial_number) — The CMDB health report shows that the serial_number attribute has the lowest population percentage (e.g., 45%) compared to other attributes. Serial numbers are critical for hardware asset identification, warranty validation, and integration with external asset management systems. Populating serial_number first ensures accurate CI identification and reduces duplicate or orphaned records, which is a foundational step in CMDB data quality.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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