Question 1,549 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
A database specialist is troubleshooting an Amazon RDS for SQL Server instance that is running out of storage. The instance has 500 GB of provisioned storage and is using General Purpose SSD (gp2). The specialist wants to set up an alarm to notify when free storage space drops below 50 GB. Which CloudWatch metric and 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
✓
Monitor the 'FreeStorageSpace' metric in bytes and set a threshold of 53687091200.
The correct metric is 'FreeStorageSpace' which is reported in bytes by CloudWatch for Amazon RDS. 50 GB equals 50 × 1024³ = 53,687,091,200 bytes. Therefore, setting a threshold of 53687091200 bytes triggers the alarm when free space drops below 50 GB. Option A is incorrect because 'FreeStorageSpace' is not available in percent; you must use bytes. Option B is incorrect because 'DiskSpaceUtilization' is not a standard CloudWatch metric for RDS (it is used for EC2). Option D is incorrect because although 'FreeStorageSpace' is the right metric, the threshold must be specified in bytes, not gigabytes; CloudWatch does not accept a unit other than bytes for this metric.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Monitor the 'FreeStorageSpace' metric in percent and set a threshold of 10.
Why it's wrong here
There is no percent metric for FreeStorageSpace; it is in bytes.
- ✗
Monitor the 'DiskSpaceUtilization' metric and set a threshold of 90.
Why it's wrong here
There is no 'DiskSpaceUtilization' metric for RDS; use 'FreeStorageSpace'.
- ✓
Monitor the 'FreeStorageSpace' metric in bytes and set a threshold of 53687091200.
Why this is correct
FreeStorageSpace is in bytes; 50 GB = 53687091200 bytes.
- ✗
Monitor the 'FreeStorageSpace' metric in gigabytes and set a threshold of 50.
Why it's wrong here
CloudWatch metrics for RDS FreeStorageSpace are in bytes, not gigabytes.
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Last reviewed: Jun 20, 2026
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