- A
Requires less storage space in the data warehouse
Why wrong: ELT stores raw data, which may require more storage than storing transformed data only.
- B
Reduces data loading time because transformations are done after loading
Data is loaded quickly without transformation, reducing initial load time.
- C
Allows data to be reprocessed easily if transformation logic changes
Raw data is retained, so transformations can be re-applied without re-extracting.
- D
Ensures data is cleaned before loading
Why wrong: In ELT, data is loaded raw and cleaned later; ETL cleans before loading.
- E
Eliminates the need for a separate ETL server
Transformations run inside the warehouse, reducing infrastructure complexity.
Question 163 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.
A data warehouse team is considering moving from an ETL to an ELT approach. Which THREE of the following are advantages of ELT over ETL?
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 loading time because transformations are done after loading
Option B is correct because in ELT, data is loaded into the data warehouse first and transformations are applied afterward. This reduces the initial loading time since no transformation processing occurs during the load phase, allowing raw data to be ingested more quickly.
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.
- ✗
Requires less storage space in the data warehouse
Why it's wrong here
ELT stores raw data, which may require more storage than storing transformed data only.
- ✓
Reduces data loading time because transformations are done after loading
Why this is correct
Data is loaded quickly without transformation, reducing initial load time.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Allows data to be reprocessed easily if transformation logic changes
Why this is correct
Raw data is retained, so transformations can be re-applied without re-extracting.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Ensures data is cleaned before loading
Why it's wrong here
In ELT, data is loaded raw and cleaned later; ETL cleans before loading.
- ✓
Eliminates the need for a separate ETL server
Why this is correct
Transformations run inside the warehouse, reducing infrastructure complexity.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that ELT reduces storage requirements, but in reality, ELT increases storage needs because raw data is persisted alongside transformed data, whereas ETL can discard raw data after transformation.
Detailed technical explanation
How to think about this question
ELT leverages the processing power of modern data warehouses (e.g., Snowflake, Amazon Redshift, Google BigQuery) to perform transformations using SQL or distributed computing frameworks like Apache Spark. This approach allows for schema-on-read, where raw data is stored in staging tables and transformed on demand, enabling flexible reprocessing if business logic changes. In contrast, ETL requires a separate transformation server and often uses staging areas outside the warehouse, increasing infrastructure complexity.
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.
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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 loading time because transformations are done after loading — Option B is correct because in ELT, data is loaded into the data warehouse first and transformations are applied afterward. This reduces the initial loading time since no transformation processing occurs during the load phase, allowing raw data to be ingested more quickly.
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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