DBS-C01 Monitoring and Troubleshooting Practice Question
A company uses Amazon DynamoDB global tables for a multi-region application. They notice that writes in one region are not appearing in another region after several minutes. What should they check first?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the ReplicationLatency metric in Amazon CloudWatch
The ReplicationLatency metric in CloudWatch directly measures the delay between a write in one region and its replication to another region in DynamoDB global tables. This is the most relevant metric to diagnose replication delays. Option B (auto scaling) affects capacity provisioning, not replication timing. Option C (DynamoDB Streams) are enabled by default for global tables to facilitate replication, but checking the metric is the immediate next step if delays are observed. Option D (table size) does not directly cause replication delays; replication is asynchronous and not size-dependent.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check the ReplicationLatency metric in Amazon CloudWatch
Why this is correct
This metric shows the lag between regions.
- ✗
Verify that auto scaling is configured identically in both regions
Why it's wrong here
Auto scaling settings do not affect replication speed.
- ✗
Ensure DynamoDB Streams are enabled on the table
Why it's wrong here
Streams are required for global tables, but the question says writes are not appearing, so they may be enabled but lagging.
- ✗
Check the table size in both regions
Why it's wrong here
Table size does not directly cause replication delays.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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