- A
Improves query performance for all queries
Why wrong: Normalization can increase joins, potentially slowing queries.
- B
Reduces data redundancy
Normalization eliminates duplicate data.
- C
Simplifies complex joins
Why wrong: Normalization often increases number of joins.
- D
Eliminates all data anomalies
Why wrong: Normalization reduces but does not eliminate all anomalies.
- E
Increases data integrity
Integrity constraints prevent anomalies.
Question 12 of 1,000
DA0-001 Data Concepts and Environments Practice Question
This DA0-001 practice question tests your understanding of data concepts and environments. 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 benefits of database normalization to 3NF? (Select 2)
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
✓
Reduces data redundancy
Normalization to 3NF eliminates transitive dependencies, which directly reduces data redundancy by ensuring each non-key attribute depends only on the primary key. This reduction in redundancy also increases data integrity because updates, inserts, and deletes are less likely to create inconsistencies or anomalies. In a relational database, 3NF achieves this without sacrificing the ability to reconstruct the original data via joins.
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.
- ✗
Improves query performance for all queries
Why it's wrong here
Normalization can increase joins, potentially slowing queries.
- ✓
Reduces data redundancy
Why this is correct
Normalization eliminates duplicate data.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Simplifies complex joins
Why it's wrong here
Normalization often increases number of joins.
- ✗
Eliminates all data anomalies
Why it's wrong here
Normalization reduces but does not eliminate all anomalies.
- ✓
Increases data integrity
Why this is correct
Integrity constraints prevent anomalies.
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 normalization with denormalization, assuming that reducing redundancy always improves query performance, when in fact normalization often increases join complexity and can slow down read queries.
Detailed technical explanation
How to think about this question
Under the hood, 3NF ensures that every non-key attribute is non-transitively dependent on the primary key, which is formally defined as: for every functional dependency X → Y, either X is a superkey or Y is a prime attribute. In practice, this means a table like `Orders` with `CustomerCity` derived from `CustomerID` would be split into `Orders` and `Customers` tables, reducing redundancy but requiring a join for queries that need the city. A real-world scenario is an e-commerce database where normalizing to 3NF prevents the same customer address from being stored in thousands of order rows, saving storage and avoiding update anomalies when a customer moves.
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 DA0-001 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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Data Concepts and Environments — study guide chapter
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FAQ
Questions learners often ask
What does this DA0-001 question test?
Data Concepts and Environments — This question tests Data Concepts and Environments — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Reduces data redundancy — Normalization to 3NF eliminates transitive dependencies, which directly reduces data redundancy by ensuring each non-key attribute depends only on the primary key. This reduction in redundancy also increases data integrity because updates, inserts, and deletes are less likely to create inconsistencies or anomalies. In a relational database, 3NF achieves this without sacrificing the ability to reconstruct the original data via joins.
What should I do if I get this DA0-001 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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Last reviewed: Jul 4, 2026
This DA0-001 practice question is part of Courseiva's free CompTIA 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 DA0-001 exam.
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