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.
A custom table 'u_custom_server' extends 'cmdb_ci_server' and has additional fields. The admin notices that while regular attribute updates on the parent table propagate correctly to the child, some custom fields are not being updated during discovery. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The identification rule does not include custom fields.
Option C is correct because ServiceNow's CMDB identification and reconciliation framework uses identification rules to determine which fields are used to match CI records during discovery. Custom fields on a child table like 'u_custom_server' are not automatically included in the parent table's identification rule; they must be explicitly added to the identification rule for the CI class. Without this, the discovery probe may create duplicate CIs or fail to update those custom fields, as the system does not consider them part of the unique identifier or update set.
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.
✗
The custom fields are not defined as 'Active' in the dictionary.
Why it's wrong here
Inactive fields would not appear in the UI but would still be updatable by backend processes.
✗
The discovery probe does not have access to the custom fields.
Why it's wrong here
Probes populate all defined fields on the CI; custom fields are included automatically.
✓
The identification rule does not include custom fields.
Why this is correct
If custom fields are not part of the identification rule, discovery will not update them.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The custom table has a stale glide record.
Why it's wrong here
A stale glide record would cause broader issues, not just custom fields.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume discovery updates all fields on a table automatically, but ServiceNow's CMDB requires explicit configuration of identification rules to control which fields are used for matching and updating, especially for custom fields on extended tables.
Detailed technical explanation
How to think about this question
Under the hood, ServiceNow's CMDB uses the Identification and Reconciliation Engine (IRE) to process incoming CI data. The IRE relies on identification rules defined per CI class to match incoming attributes against existing CIs. If a custom field is not included in the identification rule, the IRE may treat the CI as a new record (if no match is found) or ignore the custom field during updates, leading to the observed behavior. In real-world scenarios, this often happens when extending a base class like 'cmdb_ci_server' and adding fields that should be part of the unique identifier (e.g., a custom serial number or asset tag), but the admin forgets to update the identification rule for the child class.
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: The identification rule does not include custom fields. — Option C is correct because ServiceNow's CMDB identification and reconciliation framework uses identification rules to determine which fields are used to match CI records during discovery. Custom fields on a child table like 'u_custom_server' are not automatically included in the parent table's identification rule; they must be explicitly added to the identification rule for the CI class. Without this, the discovery probe may create duplicate CIs or fail to update those custom fields, as the system does not consider them part of the unique identifier or update set.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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