- A
Metric: FreeStorageSpace, Condition: < 10% of 100 GB (10 GB)
FreeStorageSpace metric with a threshold of 10 GB (assuming 100 GB allocated) would trigger when free space is below 10%.
- B
Metric: BinaryLogUsage, Condition: > 10%
Why wrong: BinaryLogUsage is for MySQL binlog, not Oracle.
- C
Metric: FreeableMemory, Condition: < 10% of total memory
Why wrong: FreeableMemory is for RAM, not storage.
- D
Metric: DiskQueueDepth, Condition: > 10
Why wrong: DiskQueueDepth indicates I/O wait, not storage space.
Question 1,280 of 1,730
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 runs an Amazon RDS for Oracle DB instance. The database administrator wants to receive an alert when the storage space is below 10% of the allocated storage. Which Amazon CloudWatch metric and alarm threshold should be used?
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
✓
Metric: FreeStorageSpace, Condition: < 10% of 100 GB (10 GB)
The correct metric is FreeStorageSpace, which reports the available storage in bytes. To alert when storage is below 10% of allocated, compute the threshold as 10% of the total allocated storage (e.g., 10 GB for 100 GB). Option A defines the condition correctly. Option B is wrong because BinaryLogUsage applies to MySQL, not Oracle. Option C is incorrect as FreeableMemory tracks memory, not storage. Option D is wrong because DiskQueueDepth measures I/O queue depth, not storage capacity.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Metric: FreeStorageSpace, Condition: < 10% of 100 GB (10 GB)
Why this is correct
FreeStorageSpace metric with a threshold of 10 GB (assuming 100 GB allocated) would trigger when free space is below 10%.
Related concept
Standard ACLs match source addresses.
- ✗
Metric: BinaryLogUsage, Condition: > 10%
Why it's wrong here
BinaryLogUsage is for MySQL binlog, not Oracle.
- ✗
Metric: FreeableMemory, Condition: < 10% of total memory
Why it's wrong here
FreeableMemory is for RAM, not storage.
- ✗
Metric: DiskQueueDepth, Condition: > 10
Why it's wrong here
DiskQueueDepth indicates I/O wait, not storage space.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
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
How this comes up in practice
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
Got this wrong? Here's your next step.
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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Monitoring and Troubleshooting — study guide chapter
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Metric: FreeStorageSpace, Condition: < 10% of 100 GB (10 GB) — The correct metric is FreeStorageSpace, which reports the available storage in bytes. To alert when storage is below 10% of allocated, compute the threshold as 10% of the total allocated storage (e.g., 10 GB for 100 GB). Option A defines the condition correctly. Option B is wrong because BinaryLogUsage applies to MySQL, not Oracle. Option C is incorrect as FreeableMemory tracks memory, not storage. Option D is wrong because DiskQueueDepth measures I/O queue depth, not storage capacity.
What should I do if I get this DBS-C01 question wrong?
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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