DBS-C01 Monitoring and Troubleshooting Practice Question
A company uses Amazon DynamoDB Global Tables for a multi-region application. The table is configured with on-demand capacity. The application writes data in the us-east-1 region and reads from us-west-2. Users in us-west-2 report that data written in us-east-1 is not appearing in us-west-2 within the expected replication latency of under 5 seconds. Instead, replication sometimes takes up to 30 seconds. Which two factors could be causing this increased replication latency? (Choose two.)
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
✓
High network latency or packet loss between us-east-1 and us-west-2.
Options B and E are correct. Option B: High network latency or packet loss between the two regions directly increases replication time. Option E: A large volume of writes creates a backlog in the Global Tables replication stream, causing delays. Option A is incorrect because reading before replication completes is a symptom, not a cause of increased latency. Option C is incorrect because read capacity in a replica region does not affect replication latency; replication uses write capacity. Option D is incorrect because on-demand capacity automatically scales and does not cause write throttling.
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 application is reading from the us-west-2 table before replication completes.
Why it's wrong here
Global Tables replicate asynchronously; reads always see committed data, but if replication is delayed, data appears later.
- ✓
High network latency or packet loss between us-east-1 and us-west-2.
Why this is correct
Replication relies on network connectivity; latency increases replication time.
- ✗
The read capacity in us-west-2 is insufficient, causing read throttling.
Why it's wrong here
Read capacity does not affect replication; replication uses write capacity in the replica region.
- ✗
The on-demand capacity mode is causing write throttling in us-east-1.
Why it's wrong here
On-demand capacity handles any throughput; it does not throttle writes.
- ✓
A large volume of writes to the table creates a backlog in the replication stream.
Why this is correct
High write throughput can delay replication as the stream processes changes.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.