DBS-C01 Management and Operations Practice Question
A team is migrating an on-premises Oracle database to Amazon Aurora PostgreSQL. The database is 2 TB and has a 6-hour maintenance window. Which AWS service should the team use to minimize downtime?
⚠ Common exam trap
AWS often tests the misconception that offline transfer services like Snowball are suitable for minimal-downtime migrations, but the trap here is that Snowball requires a full data export and import, which cannot achieve the sub-hour cutover needed within a 6-hour maintenance window.
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 (AWS DMS)
AWS DMS is the correct choice because it can perform a live migration from Oracle to Aurora PostgreSQL with minimal downtime using ongoing replication (change data capture). It supports heterogeneous migrations, automatically converting the source schema and data types, and can handle a 2 TB database within the 6-hour maintenance window by using multiple parallel tasks and large instance types.
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 (AWS DMS)
Why this is correct
DMS supports heterogeneous migrations with minimal downtime.
- ✗
Amazon S3 Transfer Acceleration
Why it's wrong here
This speeds up S3 uploads, not database migration.
- ✗
AWS Snowball Edge
Why it's wrong here
Snowball is for large data transfer, not live migration.
- ✗
Amazon EC2 with Oracle installed
Why it's wrong here
This does not automate migration.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-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 DBS-C01 exam.