DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is migrating an on-premises Oracle database to Amazon Aurora PostgreSQL. The migration uses AWS Database Migration Service (DMS) with ongoing replication. The team notices that the target Aurora database is falling behind the source during peak hours. Which of the following actions would MOST effectively improve the replication performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the DMS task to use 'Limited LOB mode' and increase the max LOB size
Option B is correct because increasing the DMS task's max LOB size or setting LOB mode to 'Limited' can reduce overhead when replicating large objects. Option A is wrong because increasing Aurora instance size may help but DMS task configuration is more direct. Option C is wrong because disabling Multi-AZ does not affect DMS performance. Option D is wrong because using a smaller Aurora instance would worsen performance.
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.
✗
Disable Multi-AZ on the target Aurora cluster
Why it's wrong here
Multi-AZ does not significantly impact DMS replication performance.
✗
Increase the Amazon Aurora instance size
Why it's wrong here
While this may help, it is not the most effective; DMS task configuration for LOBs is more impactful.
✗
Use a smaller Aurora instance to reduce write latency
Why it's wrong here
A smaller instance would have less capacity and likely worsen the lag.
✓
Configure the DMS task to use 'Limited LOB mode' and increase the max LOB size
Why this is correct
LOB handling is a common bottleneck; using Limited LOB mode reduces overhead and improves replication speed.
Related concept
Standard ACLs match source addresses.
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 DBS-C01 ACL questions on filtering logic and placement.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Configure the DMS task to use 'Limited LOB mode' and increase the max LOB size — Option B is correct because increasing the DMS task's max LOB size or setting LOB mode to 'Limited' can reduce overhead when replicating large objects. Option A is wrong because increasing Aurora instance size may help but DMS task configuration is more direct. Option C is wrong because disabling Multi-AZ does not affect DMS performance. Option D is wrong because using a smaller Aurora instance would worsen performance.
What should I do if I get this DBS-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 DBS-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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