PAS-C01 Migration Practice Question
A company is migrating an on-premises Oracle database to Amazon RDS for Oracle. The database is 2 TB and has a 4-hour maintenance window. Which AWS service should be used to minimize downtime during the migration?
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
✓
AWS Database Migration Service (DMS)
AWS Database Migration Service (DMS) supports ongoing replication with minimal downtime by using change data capture (CDC) to synchronize source and target databases continuously. Option B, AWS Server Migration Service (SMS), is designed for migrating entire server volumes, not databases. Option C, AWS Application Migration Service (MGN), automates server migration but is not optimized for database replication. Option D, AWS DataSync, is for transferring large file sets to or from AWS storage services, not for live database replication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
DMS supports continuous replication to minimize downtime.
- ✗
AWS Server Migration Service (SMS)
Why it's wrong here
SMS is for server migration, not database.
- ✗
AWS Application Migration Service (MGN)
Why it's wrong here
MGN is for server migration.
- ✗
AWS DataSync
Why it's wrong here
DataSync is for file-based data transfer.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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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.