This DBS-C01 practice question tests your understanding of management and operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company's Amazon RDS for Oracle instance is running out of storage space. The database administrator wants to add storage without downtime. Which action should be taken?
Delete old archived redo logs to free up space.
Why wrong: Deleting logs is risky and may not free enough space.
Take a snapshot and restore to a larger instance.
Why wrong: Restore causes downtime.
Use the 'Modify DB Instance' action to increase the allocated storage.
RDS allows online storage modification.
Create a new DB instance with larger storage and migrate the data.
Why wrong: Migration causes downtime.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use the 'Modify DB Instance' action to increase the allocated storage.
Option C is correct because RDS supports modifying allocated storage online with minimal downtime. Option A is wrong because creating a new instance and migrating involves downtime. Option B is wrong because increasing storage is not a backup. Option D is wrong because deleting logs may cause issues.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Delete old archived redo logs to free up space.
Why it's wrong here
Deleting logs is risky and may not free enough space.
Take a snapshot and restore to a larger instance.
Why it's wrong here
Restore causes downtime.
Use the 'Modify DB Instance' action to increase the allocated storage.
Why this is correct
RDS allows online storage modification.
Related concept
Standard ACLs match source addresses.
Create a new DB instance with larger storage and migrate the data.
Why it's wrong here
Migration causes downtime.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Management and Operations — This question tests Management and Operations — Standard ACLs match source addresses..
The correct answer is: Use the 'Modify DB Instance' action to increase the allocated storage. — Option C is correct because RDS supports modifying allocated storage online with minimal downtime. Option A is wrong because creating a new instance and migrating involves downtime. Option B is wrong because increasing storage is not a backup. Option D is wrong because deleting logs may cause issues.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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