DEA-C01 Data Store Management Practice Question
A company is migrating its on-premises Oracle database to Amazon RDS for Oracle. The database is 2 TB in size and has a 24-hour maintenance window. The migration must have minimal downtime. Which AWS service should be used for the migration?
⚠ Common exam trap
Many candidates confuse AWS Snowball Edge for any large data migration, but Snowball is designed for offline transfers where downtime is acceptable, not for minimal-downtime online migrations that require continuous replication.
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 heterogeneous migrations (Oracle to RDS for Oracle) with minimal downtime using ongoing replication via Oracle LogMiner or binary reader. DMS can perform a full load of the 2 TB database and then continuously replicate changes from the source to the target during the 24-hour maintenance window, allowing a final cutover with only seconds of downtime.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon RDS native backup and restore
Why it's wrong here
Native backup and restore requires downtime.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
DMS supports minimal downtime migrations.
- ✗
Amazon S3 Transfer Acceleration
Why it's wrong here
S3 Transfer Acceleration is for uploading to S3, not database migration.
- ✗
AWS Snowball Edge
Why it's wrong here
Snowball is for offline data transfer, which involves downtime.
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