The correct answer is to add a filter condition to the GlideRecord query because it directly reduces the dataset retrieved from the database, minimizing network transfer and server-side processing time. Without filters, the query returns all rows from a large table, causing excessive load on the instance and slow widget rendering in the Service Portal. Filtering at the database level is the most efficient way to improve portal performance, as it prevents unnecessary data from ever reaching the server script. On the ServiceNow Certified Application Developer CAD exam, this concept tests your understanding of database optimization versus post-processing—a common trap is trying to filter results in a loop after the query runs, which wastes resources. Remember the memory tip: “Filter first, fetch later”—always push conditions into the GlideRecord query itself rather than filtering the result set in code.
SNOW-CAD Designing interfaces and user experiences Practice Question
This SNOW-CAD practice question tests your understanding of designing interfaces and user experiences. 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 developer is troubleshooting a Service Portal widget that loads slowly. The widget uses a server script that queries a large table without any filters. Which design change would most improve performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a filter condition in the GlideRecord query
Option D is correct because adding a filter condition to the GlideRecord query reduces the dataset retrieved from the database, minimizing network transfer and server-side processing time. Without filters, the query returns all rows from a large table, causing excessive load on the instance and slow widget rendering. Filtering at the database level is the most efficient way to improve performance in Service Portal widgets.
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.
✗
Add client-side caching using $scope
Why it's wrong here
Caching reduces repeat requests but doesn't speed up the initial query.
✗
Load the widget using ng-if instead of ng-show
Why it's wrong here
ng-if removes DOM elements but doesn't affect server query performance.
✗
Create a custom table with only required fields
Why it's wrong here
Custom table helps but doesn't address the missing filter; still needs filter.
✓
Add a filter condition in the GlideRecord query
Why this is correct
Filtering reduces the result set, improving query performance.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse client-side optimizations (caching, DOM manipulation) with server-side data retrieval improvements, overlooking that the root cause is an unfiltered database query that must be addressed at the source.
Detailed technical explanation
How to think about this question
GlideRecord queries in ServiceNow execute as SQL SELECT statements against the underlying database; adding a filter (e.g., addQuery or addEncodedQuery) appends a WHERE clause, reducing rows returned and index usage. In Service Portal, server scripts run on the instance node, and large result sets consume heap memory and CPU, potentially causing timeouts or session deadlocks. A real-world scenario is querying the Task table without a filter, which can return millions of records and crash the widget.
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.
Designing interfaces and user experiences — This question tests Designing interfaces and user experiences — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a filter condition in the GlideRecord query — Option D is correct because adding a filter condition to the GlideRecord query reduces the dataset retrieved from the database, minimizing network transfer and server-side processing time. Without filters, the query returns all rows from a large table, causing excessive load on the instance and slow widget rendering. Filtering at the database level is the most efficient way to improve performance in Service Portal widgets.
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.
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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