CLF-C02 Cloud Technology and Services Practice Question
Which Amazon RDS feature enables automatic scaling of database storage capacity without any downtime when storage is running low?
⚠ Common exam trap
A common mix-up: candidates confuse RDS Multi-AZ with storage scaling because both involve 'automatic' behavior, but Multi-AZ only handles failover, not storage growth.
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
✓
RDS Storage Auto Scaling
RDS Storage Auto Scaling is the correct answer because it automatically increases the allocated storage for an RDS database instance when free space drops below a configured threshold, without requiring any downtime or manual intervention. This feature uses a scaling policy that triggers a storage increase in predefined increments, ensuring the database remains available and performant during storage growth.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RDS Multi-AZ
Why it's wrong here
RDS Multi-AZ is a high-availability feature that maintains a synchronously replicated standby instance in a different Availability Zone. If the primary instance fails or its Availability Zone goes down, Amazon RDS automatically promotes the standby to become the new primary. However, Multi-AZ does not monitor storage utilization or trigger capacity increases; it is designed only for failover durability, so it cannot address the described issue of storage filling up.
- ✗
RDS Read Replicas
Why it's wrong here
RDS Read Replicas are asynchronous copies of the primary database that serve read-heavy workloads by offloading SELECT queries. While they can reduce load on the primary, they do not alter the primary instance's allocated storage size or its storage growth behavior. A read replica does not automatically expand the primary's storage capacity; it simply provides an additional endpoint for reads, leaving the underlying storage pressure on the original database unresolved.
- ✓
RDS Storage Auto Scaling
Why this is correct
RDS Storage Auto Scaling is the built-in mechanism that continuously monitors the free space on your DB instance's underlying storage. When free space drops below a threshold (or when you set a maximum allocation), Amazon RDS automatically increases the storage size without requiring manual intervention, downtime, or a snapshot restore. This directly matches the requirement: it detects high utilization and expands storage on demand, making it the correct solution for avoiding out-of-space failures.
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RDS Automated Backups
Why it's wrong here
RDS Automated Backups create transactional backups of your database, enabling point-in-time recovery by restoring to any second within the backup retention window. These backups are stored separately and do not interact with the live database's storage allocation; they neither add capacity nor affect the current volume's utilization. Automated backups are purely for data protection and disaster recovery, so they cannot prevent or resolve low-free-space conditions on the running instance.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-C02 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 CLF-C02 exam.