DBS-C01 Deployment and Migration Practice Question
Exhibit
Refer to the exhibit. 2023-09-15 14:32:10 UTC - ERROR: [DBInstanceIdentifier: my-db-instance] [ErrorCode: StorageFull] [Message: The storage for the DB instance has reached its maximum allocated size. To prevent downtime, increase the allocated storage or enable storage autoscaling.]
Refer to the exhibit. A company is migrating an on-premises database to Amazon RDS for MySQL. During a test migration, the DMS task fails with the error shown. The source database is 500 GB and the target RDS instance has 500 GB allocated storage. What should be done to resolve this error and complete the migration?
⚠ Common exam trap
A common mix-up: candidates confuse storage allocation with instance class or DMS storage, thinking performance upgrades or DMS settings will fix a disk space issue, when the real problem is simply that the target RDS instance needs more storage capacity.
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
✓
Enable storage autoscaling on the RDS instance
The error indicates that the target RDS instance ran out of storage during the migration. Enabling storage autoscaling allows RDS to automatically increase storage when free space is low, preventing the migration from failing due to insufficient disk space. This is the correct resolution because the source database is 500 GB and the target has exactly 500 GB allocated, leaving no room for temporary data or logs during the migration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the DB instance class to a larger size
Why it's wrong here
The error is about storage, not compute.
- ✗
Increase the DMS task's allocated storage
Why it's wrong here
DMS tasks do not have allocated storage; the RDS instance does.
- ✗
Reduce the size of the source database
Why it's wrong here
The source database size is fixed; storage should be increased on the target.
- ✓
Enable storage autoscaling on the RDS instance
Why this is correct
Autoscaling will automatically increase storage as needed.
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