PAS-C01 Migration Practice Question
A company is migrating a multi-tier application to AWS. The application includes a load balancer, web servers, and an Oracle database. The migration plan includes using AWS DMS for the database. During the initial full load, the DMS task fails with an error indicating insufficient memory. The source database is on an EC2 instance with 4 GB RAM. What should the migration team do to resolve this issue?
⚠ Common exam trap
The trap here is that candidates may mistakenly think the error refers to the source database's memory (Option D) or that disabling LOBs (Option A) is a quick fix, when in fact the DMS replication instance's memory is the bottleneck and must be scaled up.
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 size of the DMS replication instance
The error 'insufficient memory' during the initial full load in AWS DMS typically indicates that the replication instance does not have enough memory to handle the data volume or LOB processing. Increasing the size of the DMS replication instance provides more memory for caching, transformation, and LOB handling, directly resolving the resource constraint without altering the source database or task structure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable LOB support in the DMS task
Why it's wrong here
May truncate or lose LOB data, which is not acceptable.
- ✗
Split the migration into multiple smaller tasks
Why it's wrong here
Reduces per-task load but may still hit memory limits; scaling instance is more direct.
- ✓
Increase the size of the DMS replication instance
Why this is correct
More memory on the replication instance can handle large data loads.
- ✗
Increase the memory of the source EC2 instance
Why it's wrong here
DMS memory error is on the replication instance, not the source.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.