- A
Keep the script source code under 10 KB to improve performance.
Why wrong: Script size is not a primary factor; efficiency of logic matters more.
- B
Wrap all code in try-catch blocks to handle errors gracefully.
Why wrong: Overusing try-catch can hide bugs; only use where necessary.
- C
Use gs.addInfoMessage() to output debug information while developing.
Why wrong: gs.addInfoMessage() shows messages in the UI, not in logs; use gs.log() for debugging.
- D
Avoid using GlideRecord queries inside loops to prevent performance issues.
Queries inside loops cause multiple database calls; use batch processing or GlideAggregate.
- E
Use GlideAggregate instead of GlideRecord for aggregation calculations like count or sum.
GlideAggregate performs aggregation at the database level, reducing data transfer.
Quick Answer
The correct answer is to use GlideAggregate instead of GlideRecord for aggregation calculations like count or sum. This is because running GlideRecord queries inside loops—such as for or while statements—forces multiple database round-trips, which severely degrades performance, especially when handling large datasets. By using GlideAggregate, you offload the aggregation work to the database server, returning only the computed result in a single query, which is far more efficient. On the ServiceNow Certified Application Developer CAD exam, this question tests your understanding of performance optimization in Script Includes, a common area where candidates fall into the trap of writing GlideRecord loops for simple counts or sums. A helpful memory tip: remember that GlideAggregate is your “single-shot” tool for math—if you need a count, sum, min, max, or average, never loop; aggregate it.
SNOW-CAD Practice Question: Automating application logic with business rules and scripts
This SNOW-CAD practice question tests your understanding of automating application logic with business rules and scripts. 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.
Which two of the following are best practices when writing Script Includes in ServiceNow? (Choose two.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Avoid using GlideRecord queries inside loops to prevent performance issues.
Option D is correct because running GlideRecord queries inside loops (e.g., for or while) causes multiple database round-trips, which severely degrades performance, especially with large datasets. Instead, you should use GlideRecord's query() once and iterate over the result set, or use GlideAggregate for aggregated calculations to minimize database calls.
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.
- ✗
Keep the script source code under 10 KB to improve performance.
Why it's wrong here
Script size is not a primary factor; efficiency of logic matters more.
- ✗
Wrap all code in try-catch blocks to handle errors gracefully.
Why it's wrong here
Overusing try-catch can hide bugs; only use where necessary.
- ✗
Use gs.addInfoMessage() to output debug information while developing.
Why it's wrong here
gs.addInfoMessage() shows messages in the UI, not in logs; use gs.log() for debugging.
- ✓
Avoid using GlideRecord queries inside loops to prevent performance issues.
Why this is correct
Queries inside loops cause multiple database calls; use batch processing or GlideAggregate.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use GlideAggregate instead of GlideRecord for aggregation calculations like count or sum.
Why this is correct
GlideAggregate performs aggregation at the database level, reducing data transfer.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ServiceNow often tests the misconception that all code should be wrapped in try-catch for error handling, but in ServiceNow, this is not a best practice because it can hide logic errors and is rarely needed due to the platform's built-in error logging and transactional rollback.
Trap categories for this question
Command / output trap
gs.addInfoMessage() shows messages in the UI, not in logs; use gs.log() for debugging.
Detailed technical explanation
How to think about this question
Under the hood, each GlideRecord query() call opens a new database connection and executes a SQL SELECT statement; placing this inside a loop can lead to N+1 query problems, exponentially increasing load on the database. GlideAggregate offloads aggregation logic (e.g., COUNT, SUM, AVG) to the database server, returning only the computed result, which is far more efficient than fetching all records and counting them in JavaScript. In real-world scenarios, a loop with GlideRecord queries on a table with 100,000 records could cause timeouts or degrade instance performance for all users.
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-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 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-CAD question test?
Automating application logic with business rules and scripts — This question tests Automating application logic with business rules and scripts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Avoid using GlideRecord queries inside loops to prevent performance issues. — Option D is correct because running GlideRecord queries inside loops (e.g., for or while) causes multiple database round-trips, which severely degrades performance, especially with large datasets. Instead, you should use GlideRecord's query() once and iterate over the result set, or use GlideAggregate for aggregated calculations to minimize database calls.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 30, 2026
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.
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