The correct action is to increase the amount of archive log space or reduce the log retention period on the source Oracle database. This resolves the DMS archive log space error because AWS DMS relies on Oracle’s archived redo logs to capture ongoing changes for Change Data Capture (CDC); when the source runs out of archive log space, DMS cannot read the logs needed to replicate transactions, causing the task to fail. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding that DMS does not manage on-premises database storage—it only consumes the logs—so the fix must be applied at the source, not by adjusting DMS memory or buckets. A common trap is assuming AWS can handle on-premises log management, but the responsibility lies with the database administrator. Memory tip: “Logs are local—fix the source, not the service.”
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 pipeline uses AWS DMS to replicate data from an on-premises Oracle database to Amazon S3 in Parquet format. The pipeline has been running successfully for months, but recently the DMS task status shows 'failed' with the error: 'The source database is running out of archive log space.' Which action should the engineer take to prevent this error?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the amount of archive log space or reduce the log retention period on the source Oracle database.
Option D is correct because increasing the archive log retention on the source ensures DMS can read changes before logs are purged. Option A is incorrect because DMS uses CDC logs; adding more memory does not fix log space. Option B is incorrect because DMS tasks can only use one S3 bucket. Option C is incorrect because AWS does not manage on-premises database logs.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure multiple target S3 buckets to distribute the load.
Why it's wrong here
DMS writes to one target; multiple buckets are not supported.
✓
Increase the amount of archive log space or reduce the log retention period on the source Oracle database.
Why this is correct
More space or shorter retention prevents log space exhaustion.
Related concept
Standard ACLs match source addresses.
✗
Enable automatic log archiving on the DMS replication instance.
Why it's wrong here
DMS does not manage source database logs.
✗
Increase the memory allocation for the DMS replication instance.
Why it's wrong here
Memory does not affect source archive log space.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Data Operations and Support — This question tests Data Operations and Support — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Increase the amount of archive log space or reduce the log retention period on the source Oracle database. — Option D is correct because increasing the archive log retention on the source ensures DMS can read changes before logs are purged. Option A is incorrect because DMS uses CDC logs; adding more memory does not fix log space. Option B is incorrect because DMS tasks can only use one S3 bucket. Option C is incorrect because AWS does not manage on-premises database logs.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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