DA0-001 Mining and Acquiring Data Practice Question
This DA0-001 practice question tests your understanding of mining and acquiring data. 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.
Exhibit
Refer to the exhibit.
Data Import Log:
[2024-03-15 10:22:34] INFO: Starting import from source 'sales_raw.csv'
[2024-03-15 10:22:35] WARN: Row 1502: 'price' field contains non-numeric value '12.5A'. Skipping row.
[2024-03-15 10:22:36] ERROR: Row 3450: 'date' field value '2024-02-30' is invalid. Import halted.
[2024-03-15 10:22:36] INFO: Import process terminated with errors.
Based on the exhibit, what is the most likely cause of the import failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Refer to the exhibit.
Data Import Log:
[2024-03-15 10:22:34] INFO: Starting import from source 'sales_raw.csv'
[2024-03-15 10:22:35] WARN: Row 1502: 'price' field contains non-numeric value '12.5A'. Skipping row.
[2024-03-15 10:22:36] ERROR: Row 3450: 'date' field value '2024-02-30' is invalid. Import halted.
[2024-03-15 10:22:36] INFO: Import process terminated with errors.
A
The file is empty or contains only headers.
Why wrong: Rows were processed, so the file has data.
B
The price field includes non-numeric characters that cannot be parsed.
Why wrong: That row was skipped but import continued.
C
The source file is corrupted or in an unsupported format.
Why wrong: The file was opened and rows processed until row 3450.
D
A data quality issue: the date field contains an invalid date.
The date '2024-02-30' is invalid and caused the import to halt.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A data quality issue: the date field contains an invalid date.
Option D is correct because the exhibit shows a date field containing '2023-02-30', which is an invalid date (February never has 30 days). This data quality issue causes the import to fail, as the system likely validates date values against calendar rules before inserting them into the target table. The error is not due to file emptiness, non-numeric characters, or corruption, but specifically a semantic data integrity violation.
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 file is empty or contains only headers.
Why it's wrong here
Rows were processed, so the file has data.
✗
The price field includes non-numeric characters that cannot be parsed.
Why it's wrong here
That row was skipped but import continued.
✗
The source file is corrupted or in an unsupported format.
Why it's wrong here
The file was opened and rows processed until row 3450.
✓
A data quality issue: the date field contains an invalid date.
Why this is correct
The date '2024-02-30' is invalid and caused the import to halt.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 may overlook semantic data quality issues (like invalid dates) and instead focus on syntactic problems (like file format or non-numeric characters), even though the exhibit clearly shows a date that does not exist in the calendar.
Detailed technical explanation
How to think about this question
Under the hood, ETL tools and databases enforce date validation using calendar logic (e.g., ISO 8601 or database-specific date functions). For example, PostgreSQL's `TO_DATE()` function or MySQL's `STR_TO_DATE()` will raise an error for '2023-02-30' because it fails the Gregorian calendar check. In real-world scenarios, such invalid dates often arise from manual data entry errors or legacy system exports without proper validation, causing silent failures or row rejections during bulk imports.
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.
Mining and Acquiring Data — This question tests Mining and Acquiring Data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A data quality issue: the date field contains an invalid date. — Option D is correct because the exhibit shows a date field containing '2023-02-30', which is an invalid date (February never has 30 days). This data quality issue causes the import to fail, as the system likely validates date values against calendar rules before inserting them into the target table. The error is not due to file emptiness, non-numeric characters, or corruption, but specifically a semantic data integrity violation.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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