Question 981 of 1,663
DBS-C01 Deployment and Migration Practice Question
A company is migrating a 2 TB Oracle database to Amazon Aurora PostgreSQL. The migration requires ongoing replication for minimal downtime. Which THREE AWS services should be used?
⚠ Common exam trap
Candidates often think AWS DataSync is suitable for database replication, but it only handles file-level transfers and cannot perform ongoing change data capture for databases.
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 supports ongoing replication (change data capture) from Oracle to Amazon Aurora PostgreSQL, enabling minimal downtime migration. It can continuously replicate changes from the source Oracle database to the target Aurora PostgreSQL instance until the cutover, allowing the source to remain operational during the migration.
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 is the primary service for data migration and ongoing replication.
- ✓
Amazon S3
Why this is correct
S3 can be used as an intermediate store for DMS tasks.
- ✗
AWS DataSync
Why it's wrong here
DataSync is for file transfers, not database migration.
- ✓
AWS Schema Conversion Tool (AWS SCT)
Why this is correct
SCT converts Oracle schema to PostgreSQL-compatible format.
- ✗
AWS Lambda
Why it's wrong here
Lambda is not a database migration service.
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Same concept, more angles
1 more way this is tested on DBS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is migrating a 2 TB Oracle database to Amazon Aurora PostgreSQL. The migration must have minimal downtime and support ongoing replication. Which AWS service should be used?
medium- A.AWS DataSync
- B.Amazon S3 Glacier
- ✓ C.AWS Database Migration Service (AWS DMS)
- D.AWS Schema Conversion Tool (AWS SCT)
Why C: AWS Database Migration Service (AWS DMS) is the correct choice because it supports ongoing replication (change data capture, CDC) from an Oracle source to an Amazon Aurora PostgreSQL target, enabling a migration with minimal downtime. DMS can handle a 2 TB database by using a large replication instance and tuning task settings, and it continuously replicates changes until the cutover is complete.
Last reviewed: Jul 4, 2026
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