Quick Answer
The answer is change data capture (CDC). This method is correct because it specifically extracts only the data that has been modified since the last extraction, typically by reading a timestamp column or a change log, rather than reprocessing the entire dataset. On the CompTIA Data+ DA0-001 exam, this concept tests your understanding of incremental extraction strategies during data acquisition, where efficiency and reduced load on source systems are key. A common trap is confusing CDC with a full extraction, which pulls all records every time, or a snapshot, which captures a point-in-time state without tracking changes. Remember the memory tip: “CDC tracks the delta, not the whole data.”
This DA0-001 practice question tests your understanding of mining and acquiring 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.
During data acquisition, a data engineer uses a tool to extract data from a source system incrementally based on a timestamp column. Which method is being used?
Change data capture (CDC)
CDC uses timestamps or logs to extract only changed data.
Snapshot extraction
Why wrong: Snapshot extracts a full copy at a point in time.
Full extraction
Why wrong: Full extraction retrieves all data, not just changes.
Manual extraction
Why wrong: Manual processes are not automated incremental extraction.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Change data capture (CDC)
Change data capture (CDC) captures modifications since the last extraction. Full extraction retrieves all data each time, snapshot extracts a point-in-time copy, and manual is not automated.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Change data capture (CDC)
Why this is correct
CDC uses timestamps or logs to extract only changed data.
Related concept
Read the scenario before looking for a memorised answer.
Snapshot extraction
Why it's wrong here
Snapshot extracts a full copy at a point in time.
Full extraction
Why it's wrong here
Full extraction retrieves all data, not just changes.
Manual extraction
Why it's wrong here
Manual processes are not automated incremental extraction.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which DA0-001 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
Mining and Acquiring Data — This question tests Mining and Acquiring Data — Read the scenario before looking for a memorised answer..
The correct answer is: Change data capture (CDC) — Change data capture (CDC) captures modifications since the last extraction. Full extraction retrieves all data each time, snapshot extracts a point-in-time copy, and manual is not automated.
Identify which DA0-001 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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