The answer is that the GlideRecord query used a default active filter, which limited updates to only active records. This occurs because ServiceNow’s GlideRecord API automatically applies a condition of `active=true` when no explicit query condition is set, a behavior known as the GlideRecord default active filter. As a result, the script only processed a subset of incidents—those marked as active—rather than all records in the table, causing the developer to see partial updates. On the ServiceNow Certified Application Developer CAD exam, this concept tests your understanding of implicit platform defaults versus explicit coding, often appearing as a trick where a developer forgets to add a condition and assumes all records are affected. The common trap is overlooking that GlideRecord is not a simple “get all” command; it inherits the table’s default view filter. Memory tip: think “no condition = active condition” to remember that an empty query defaults to active records only.
SNOW-CAD Working with Data Practice Question
This SNOW-CAD practice question tests your understanding of working with data. 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 developer writes a business rule that queries the 'incident' table using GlideRecord. The script loops through all incidents and updates a field. After running, the developer notices that only a subset of records were updated. 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 GlideRecord query did not include a condition, so it used a default filter that limited results
Option B is correct because GlideRecord queries in ServiceNow automatically apply a default filter when no explicit condition is set, typically limiting results to records where the `active` field is `true`. This default behavior, known as the 'active filter,' causes the script to only process a subset of incidents (those that are active) rather than all records in the table, explaining why only some were updated.
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 user running the script lacks write ACL on the table
Why it's wrong here
Lack of ACL would cause an error, not a silent skip.
✓
The GlideRecord query did not include a condition, so it used a default filter that limited results
Why this is correct
Without an explicit query, GlideRecord may apply a default filter (e.g., active=true) or system limit.
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 field name used in the update was misspelled
Why it's wrong here
A typo would cause a script error, not a partial update.
✗
The script did not call getRowCount() before the loop
Why it's wrong here
getRowCount() is not required for correct iteration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume GlideRecord returns all records by default, but ServiceNow's platform applies an implicit active filter, causing partial results unless explicitly overridden.
Detailed technical explanation
How to think about this question
Under the hood, GlideRecord's default query behavior applies an implicit `active=true` condition when no `addQuery()` is called, which is a ServiceNow-specific optimization to prevent accidental processing of inactive records. This can be overridden by explicitly calling `addQuery('active', '!=', 'true')` or using `setWorkflow(false)` in some contexts. In real-world scenarios, developers often miss this default filter when writing scripts for tables like `incident` or `task`, leading to unexpected partial updates that are hard to debug without checking the query conditions.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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.
Working with Data — This question tests Working with Data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The GlideRecord query did not include a condition, so it used a default filter that limited results — Option B is correct because GlideRecord queries in ServiceNow automatically apply a default filter when no explicit condition is set, typically limiting results to records where the `active` field is `true`. This default behavior, known as the 'active filter,' causes the script to only process a subset of incidents (those that are active) rather than all records in the table, explaining why only some were updated.
What should I do if I get this SNOW-CAD 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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