The correct answer is to move the query to a Business Rule and use a client-callable API like GlideAjax. This approach resolves the client script execution timeout by offloading the heavy GlideRecord query from the browser to the server, where processing limits are higher and the operation can complete without triggering the client-side timeout error. For the ServiceNow Certified Application Developer CAD exam, this scenario tests your understanding of performance optimization patterns—specifically that client scripts should never run unfiltered queries on large tables, as they block the UI thread. A common trap is assuming you can simply increase the timeout or add a database index, but neither fixes the root cause: the query itself belongs server-side. Remember the memory tip: “Clients click, servers work”—if a query is heavy, move it to a Business Rule or Scripted REST API and call it via GlideAjax to keep the client responsive.
SNOW-CAD Practice Question: Application development using ServiceNow Studio
This SNOW-CAD practice question tests your understanding of application development using servicenow studio. 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 company uses a scoped application to manage IT equipment. The application has a client script that calls a GlideRecord query on a large table. Recently, the script started showing 'Script exceeded maximum execution time' errors. The developer checks the Studio debugger and sees the query runs on the entire table without filters. The developer needs to fix this issue. The environment is production, and downtime must be minimized. Which course of action should the developer take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Move the query to a Business Rule and use a client-callable API.
Option D is correct because moving the query to a Business Rule and using a client-callable API (like GlideAjax) offloads the processing to the server and avoids client-side timeouts. Option A is wrong because increasing timeout is not a sustainable fix. Option B is wrong because GlideAggregate is for aggregation, not for retrieving records. Option C is wrong because adding an index would not help if the query is unfiltered; it would still scan.
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.
✓
Move the query to a Business Rule and use a client-callable API.
Why this is correct
Correct. Offloading to server-side solves the timeout and improves performance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the script execution timeout in system properties.
Why it's wrong here
Incorrect. This masks the problem and may cause other issues.
✗
Use GlideAggregate with multiple queries.
Why it's wrong here
Incorrect. GlideAggregate is for aggregation, not for retrieving records.
✗
Add an index on the table.
Why it's wrong here
Incorrect. Without filters, an index won't help.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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-CAD 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 SNOW-CAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Application development using ServiceNow Studio — This question tests Application development using ServiceNow Studio — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Move the query to a Business Rule and use a client-callable API. — Option D is correct because moving the query to a Business Rule and using a client-callable API (like GlideAjax) offloads the processing to the server and avoids client-side timeouts. Option A is wrong because increasing timeout is not a sustainable fix. Option B is wrong because GlideAggregate is for aggregation, not for retrieving records. Option C is wrong because adding an index would not help if the query is unfiltered; it would still scan.
What should I do if I get this SNOW-CAD question wrong?
Identify which SNOW-CAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This SNOW-CAD practice question is part of Courseiva's free ServiceNow certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SNOW-CAD exam.
Question Discussion
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