Question 1,280 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
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.
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%.
- ✗
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.
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Same concept, more angles
1 more way this is tested on DBS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A database administrator needs to monitor the free storage space on an Amazon RDS for SQL Server instance. Which TWO CloudWatch metrics should be used? (Choose two.)
easy- A.DatabaseConnections
- B.ReadLatency
- C.BinLogDiskUsage
- ✓ D.FreeStorageSpaceInPercent
- ✓ E.FreeStorageSpace
Why D: (FreeStorageSpaceInPercent) and Option E (FreeStorageSpace) are correct. Option A is wrong because DatabaseConnections measures the number of connections, not storage. Option B is wrong because ReadLatency measures read latency, not storage. Option C is wrong because BinLogDiskUsage is a metric for MySQL/RDS for MySQL, not for SQL Server.
Last reviewed: Jun 20, 2026
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