- A
The table must have a unique name starting with 'u_'
Why wrong: While naming convention is important, it is not a performance or maintainability consideration.
- B
The table should be created in the global scope to ensure universal access
Why wrong: Scope is about application isolation, not performance or maintainability of table extension.
- C
The table must have a reference field back to the parent table
Why wrong: Extended tables automatically inherit the parent's fields; a reference field is unnecessary and would create redundancy.
- D
The number of records in the parent table may impact query performance when retrieving child records
When extending, queries often include parent table records, which can slow down if the parent table is large.
- E
Adding too many fields to the extended table can degrade performance and increase complexity
Excessive fields, especially on a heavily used table, can slow down form loads and database operations.
Quick Answer
The answer is that adding too many fields to the extended table and the impact of parent records on performance are the two key considerations. When you extend a table, every field you add increases the row size and storage overhead, which degrades query performance and complicates maintenance. Additionally, because an extended table inherits all the fields, indexes, and business logic of its parent, any performance bottleneck in the parent—such as heavy scripts or large record counts—directly cascades down to the child table, making it critical to evaluate the parent’s workload before extending. On the ServiceNow Certified Application Developer CAD exam, this question tests your understanding of table inheritance trade-offs, often appearing as a “choose two” trap where distractors like “using dot-walking” or “adding indexes” seem plausible but miss the core performance risks. A common memory tip is to think of table extension as stacking blocks: too many blocks (fields) makes the tower unstable, and a shaky base (parent records) guarantees the whole structure will wobble.
SNOW-CAD Creating and customizing tables and data Practice Question
This SNOW-CAD practice question tests your understanding of creating and customizing tables and 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.
When creating a custom table to extend an existing table, which TWO considerations should be evaluated to ensure optimal performance and maintainability? (Choose two.)
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
The number of records in the parent table may impact query performance when retrieving child records
Options B and D are correct because extending tables can increase complexity and affect performance, and adding unnecessary fields leads to maintenance issues. Options A, C, and E are incorrect or not directly related to table extension considerations.
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 table must have a unique name starting with 'u_'
Why it's wrong here
While naming convention is important, it is not a performance or maintainability consideration.
- ✗
The table should be created in the global scope to ensure universal access
Why it's wrong here
Scope is about application isolation, not performance or maintainability of table extension.
- ✗
The table must have a reference field back to the parent table
Why it's wrong here
Extended tables automatically inherit the parent's fields; a reference field is unnecessary and would create redundancy.
- ✓
The number of records in the parent table may impact query performance when retrieving child records
Why this is correct
When extending, queries often include parent table records, which can slow down if the parent table is large.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Adding too many fields to the extended table can degrade performance and increase complexity
Why this is correct
Excessive fields, especially on a heavily used table, can slow down form loads and database operations.
Related concept
Read the scenario before looking for a memorised answer.
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.
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FAQ
Questions learners often ask
What does this SNOW-CAD question test?
Creating and customizing tables and data — This question tests Creating and customizing tables and data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The number of records in the parent table may impact query performance when retrieving child records — Options B and D are correct because extending tables can increase complexity and affect performance, and adding unnecessary fields leads to maintenance issues. Options A, C, and E are incorrect or not directly related to table extension considerations.
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.
About these practice questions
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Last reviewed: Jun 24, 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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