DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon DynamoDB with global tables to support a multi-region application. They notice that writes to the table in us-east-1 are not replicating to the table in eu-west-1. The replication lag metric shows increasing values. What is the most likely cause?
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
✓
The table in eu-west-1 has been removed as a replica region from the global table configuration.
If the replica region (eu-west-1) has been removed from the global table configuration, DynamoDB will stop replicating writes to that region, and the replication lag metric will show increasing values. Option A is incorrect: while a lower write capacity in eu-west-1 could cause throttling and replication lag, it would not completely stop replication; the lag metric would still show some activity. Option B is incorrect: DynamoDB Streams must be enabled on the source table for global tables to function, but disabling them would halt replication entirely, not cause increasing lag. Option C is incorrect: global tables replicate asynchronously over DynamoDB's internal network and do not require VPC connectivity between regions.
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 table in eu-west-1 has a lower write capacity and is throttling incoming writes.
Why it's wrong here
Global tables use the provisioned capacity of the replica table; throttling can cause lag.
- ✗
DynamoDB Streams is disabled on the table in us-east-1.
Why it's wrong here
Disabling streams would stop all replication, not cause lag.
- ✗
The DynamoDB table in us-east-1 is not accessible from eu-west-1 due to VPC restrictions.
Why it's wrong here
DynamoDB global tables operate over the AWS global network, not VPC.
- ✓
The table in eu-west-1 has been removed as a replica region from the global table configuration.
Why this is correct
If the replica region is removed, replication stops.
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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.