Question 188 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
A DevOps engineer notices that an Amazon RDS for PostgreSQL instance has been in 'storage-full' state for the past 30 minutes. The instance has 500 GB of General Purpose SSD (gp2) storage, and the free storage space is 0 bytes. The database is critical and cannot tolerate downtime. What is the MOST efficient way to resolve this issue while minimizing downtime?
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
✓
Modify the DB instance to increase allocated storage to 1,000 GB
Modifying the storage allocation for an RDS instance can be done without downtime; the instance remains available during the modification. Increasing storage from 500 GB to 1,000 GB immediately resolves the 'storage-full' state. Option A is wrong because taking a snapshot and restoring to a new instance incurs downtime. Option C is wrong because enabling storage auto-scaling does not address the current full state; it only prevents future issues. Option D is wrong because deleting data may not free enough space and requires time-consuming intervention, risking downtime.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Take a snapshot of the DB instance and restore it to a new instance with larger storage
Why it's wrong here
Restoring from snapshot causes downtime.
- ✓
Modify the DB instance to increase allocated storage to 1,000 GB
Why this is correct
Modifying storage online adds space without downtime.
- ✗
Enable storage auto-scaling on the DB instance
Why it's wrong here
Auto-scaling does not trigger instantly when storage is already full.
- ✗
Delete unnecessary data, such as old logs or temporary tables
Why it's wrong here
Manual deletion may not recover enough space quickly and could be risky.
Visual reference
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Last reviewed: Jun 20, 2026
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.
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