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.
Error log:
```
2025-03-15 10:23:45 ERROR: ORA-12034: materialized view log on "SCHEMA"."SALES" is newer than last refresh
2025-03-15 10:23:45 INFO: Refresh of materialized view "SALES_MV" failed
```
A data analyst sees this error in the ETL logs. What is the most likely cause?
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.
Error log:
```
2025-03-15 10:23:45 ERROR: ORA-12034: materialized view log on "SCHEMA"."SALES" is newer than last refresh
2025-03-15 10:23:45 INFO: Refresh of materialized view "SALES_MV" failed
```
A
The materialized view log was updated after the last refresh
The log is newer, indicating changes that need a full refresh.
B
The source table was dropped
Why wrong: Dropping would cause a different error.
C
The analyst does not have permission to refresh the view
Why wrong: The error is about log timing, not permissions.
D
There is a network connection timeout
Why wrong: Connection timeout would show a timeout error.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The materialized view log was updated after the last refresh
The error indicates that the materialized view's underlying data has changed since its last refresh, specifically because the materialized view log was updated. Materialized views rely on logs to track changes for fast refreshes; if the log is updated after the last refresh, the view's snapshot becomes stale and cannot be incrementally refreshed without a complete refresh. This is a common cause of refresh failures in Oracle databases.
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 materialized view log was updated after the last refresh
Why this is correct
The log is newer, indicating changes that need a full refresh.
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.
✗
The source table was dropped
Why it's wrong here
Dropping would cause a different error.
✗
The analyst does not have permission to refresh the view
Why it's wrong here
The error is about log timing, not permissions.
✗
There is a network connection timeout
Why it's wrong here
Connection timeout would show a timeout error.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between fast refresh and complete refresh errors, and the trap here is that candidates confuse a log update with a source table drop or permission issue, not realizing that the error message specifically points to a log timestamp mismatch.
Trap categories for this question
Command / output trap
Connection timeout would show a timeout error.
Detailed technical explanation
How to think about this question
Materialized views use a materialized view log (MLOG$) to record DML changes on the master table for fast refresh. If the log is truncated or updated after the last refresh, the view's snapshot SCN (System Change Number) no longer matches, forcing a complete refresh. In Oracle, the error ORA-12034 ('materialized view log on table is newer than last refresh') directly corresponds to this scenario, and the fix is to perform a complete refresh (DBMS_MVIEW.REFRESH with method 'C').
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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: The materialized view log was updated after the last refresh — The error indicates that the materialized view's underlying data has changed since its last refresh, specifically because the materialized view log was updated. Materialized views rely on logs to track changes for fast refreshes; if the log is updated after the last refresh, the view's snapshot becomes stale and cannot be incrementally refreshed without a complete refresh. This is a common cause of refresh failures in Oracle databases.
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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