DBS-C01 Deployment and Migration Practice Question
A company is migrating a 3 TB on-premises Oracle database to Amazon Aurora PostgreSQL using AWS DMS. The migration task is failing with an error indicating insufficient memory. Which TWO actions should the company take to resolve this issue? (Choose TWO.)
⚠ Common exam trap
The trap here is that candidates might confuse a DMS replication instance memory issue with a target database performance issue, leading them to incorrectly change the target engine or disable Multi-AZ instead of scaling the replication instance.
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
✓
Increase the instance class of the DMS replication instance.
The 'insufficient memory' error during an AWS DMS migration indicates that the replication instance lacks the memory required to handle the data volume, transformation rules, or cache for large transactions. Increasing the instance class (e.g., from dms.c5.large to dms.c5.2xlarge) provides more memory and CPU, directly resolving the resource constraint.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the target database engine to Amazon RDS for MySQL.
Why it's wrong here
Changing the target engine does not resolve the memory issue.
- ✗
Disable Multi-AZ on the DMS replication instance.
Why it's wrong here
Multi-AZ does not affect memory; it provides high availability.
- ✓
Increase the instance class of the DMS replication instance.
Why this is correct
A larger instance class provides more memory to handle the migration.
- ✓
Reduce the number of tables being migrated in the task.
Why this is correct
Migrating fewer tables simultaneously reduces memory consumption.
- ✗
Use a smaller instance class for the DMS replication instance.
Why it's wrong here
A smaller instance class would have less memory, worsening the issue.
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