PAS-C01 Migration Practice Question
A company is migrating a large Oracle database to Amazon RDS for Oracle. They want to minimize downtime during the migration. Which AWS service should they use to replicate data in real time?
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 DMS (Database Migration Service) supports ongoing replication with minimal downtime, making it ideal for migrating large databases like Oracle to Amazon RDS for Oracle while keeping the source and target in sync. Option A (AWS SMS) is for server migration, not database replication. Option B (AWS SCT) is a schema conversion tool, not for real-time data replication. Option D (AWS DataSync) is for file-based data transfer, not database replication.
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 Server Migration Service (SMS)
Why it's wrong here
SMS is for server-level virtualization, not database replication.
- ✗
AWS Schema Conversion Tool (SCT)
Why it's wrong here
SCT converts database schema, not replicate data.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
DMS supports ongoing replication to minimize downtime.
- ✗
AWS DataSync
Why it's wrong here
AWS DataSync is designed for one-time bulk transfers or scheduled batch replication of file data to Amazon S3, Amazon EFS, or Amazon FSx, not for continuous real-time change data capture from an Oracle database. It lacks the ability to stream ongoing transactional changes, which is essential for minimising downtime during a live database migration. This option is tempting because DataSync efficiently handles large initial data loads across storage services, making it a correct choice for migrating file shares or static datasets where near-real-time synchronisation is unnecessary.
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