DBS-C01 Deployment and Migration Practice Question
Network Topology
A database administrator runs the above CLI command. The output shows that 'mydb' is a read replica of 'mydb-source'. The administrator wants to promote 'mydb' to a standalone instance with no downtime. Which action should be taken?
⚠ Common exam trap
Many candidates confuse promoting a read replica with other high-availability or backup operations, such as Multi-AZ or snapshot restore, which do not achieve the same zero-downtime promotion goal.
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
✓
Use the promote-read-replica CLI command.
The `promote-read-replica` CLI command is the correct action because it transitions the read replica from a replication slave to a standalone primary DB instance without requiring any downtime. During promotion, RDS stops replication and makes the replica writable, but the instance remains available throughout the process. This is the only method that achieves zero downtime promotion directly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use the promote-read-replica CLI command.
Why this is correct
Promoting a read replica makes it a standalone instance without downtime.
- ✗
Modify the DB instance to enable Multi-AZ, which automatically promotes it.
Why it's wrong here
Enabling Multi-AZ requires a reboot, causing downtime.
- ✗
Create a snapshot of the read replica and restore it as a new DB instance.
Why it's wrong here
This creates a new instance, but does not promote the existing one.
- ✗
Modify the DB instance class to a larger size to force promotion.
Why it's wrong here
Modifying the instance class requires a reboot.
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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.