DEA-C01 Data Store Management Practice Question
A company is migrating its on-premises Oracle database to Amazon Aurora PostgreSQL. The migration must have minimal downtime. The source database is 2 TB and runs on a single server. Which AWS service should be used for the migration?
⚠ Common exam trap
Watch out — candidates often confuse AWS DataSync or Snowball Edge as viable for database migrations because they handle large data volumes, but they lack the schema conversion and ongoing replication capabilities required for minimal-downtime database migrations.
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) is the correct choice because it supports homogeneous migrations from Oracle to Amazon Aurora PostgreSQL with minimal downtime using ongoing replication (change data capture). DMS can handle a 2 TB source database by performing a full load followed by continuous replication of changes from the Oracle redo logs, allowing the target Aurora database to stay nearly in sync until cutover.
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 DataSync
Why it's wrong here
DataSync is for file-based data transfer.
- ✗
Amazon S3 Transfer Acceleration
Why it's wrong here
S3 is not for database migration.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
DMS provides minimal downtime migration with change data capture.
- ✗
AWS Snowball Edge
Why it's wrong here
Snowball is for offline transfer, not minimal downtime.
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