DBS-C01 Deployment and Migration Practice Question
A company is migrating a 1 TB Amazon RDS for Oracle database to Amazon RDS for PostgreSQL. The migration must be completed within a 4-hour maintenance window. The database has a high volume of transactions. Which migration method minimizes risk of data loss?
⚠ Common exam trap
Watch out — candidates often assume AWS SCT plus DMS full load (Option A) is sufficient for minimal data loss, overlooking that CDC is required to capture ongoing transactions during the migration 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
✓
Use AWS DMS with a full load and change data capture (CDC) enabled, with task restart and validation.
AWS DMS with full load and CDC enables continuous replication of ongoing transactions after the initial load, minimizing data loss risk during the migration window. The task restart and validation features ensure resilience against transient failures and data integrity checks, critical for a high-volume transactional database. This approach meets the 4-hour window by allowing the full load to complete within the window while CDC captures any changes that occur during and after the load.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AWS SCT to convert the schema, then use AWS DMS for full load and ongoing replication.
Why it's wrong here
Ongoing replication may not complete within 4 hours.
- ✗
Set up Oracle log shipping to an EC2 instance, then restore to RDS PostgreSQL.
Why it's wrong here
Log shipping across engines not supported.
- ✓
Use AWS DMS with a full load and change data capture (CDC) enabled, with task restart and validation.
Why this is correct
CDC captures ongoing changes, task restart ensures reliability.
- ✗
Export the Oracle database using Data Pump, import to PostgreSQL using pgloader.
Why it's wrong here
Export/import is time-consuming and may not fit in 4 hours.
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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.