DBS-C01 Management and Operations Practice Question
A company is migrating its on-premises Oracle database to Amazon RDS for Oracle. The database is 2 TB in size and the network bandwidth is 100 Mbps. The migration must have minimal downtime. Which TWO approaches should be used together to achieve this?
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 Database Migration Service (DMS) with ongoing replication to keep the target in sync.
AWS DMS with ongoing replication allows continuous data replication with minimal downtime. AWS Snowball can be used for the initial large data transfer to avoid prolonged network transfer. Option A (taking a full backup and restoring) would cause downtime; Option B (increasing bandwidth) is not feasible quickly; Option C (SCT) is for schema conversion, not data migration; Option D (DMS with ongoing replication) is correct; Option E (Snowball for initial load then DMS for ongoing changes) minimizes network transfer time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Take a full backup of the source database and restore it to Amazon RDS.
Why it's wrong here
Taking a full backup and restoring it to Amazon RDS would cause significant downtime, which does not meet the minimal downtime requirement.
- ✗
Increase the network bandwidth to 1 Gbps to speed up the transfer.
Why it's wrong here
Increasing network bandwidth to 1 Gbps may help but is not a feasible quick solution and does not address the migration approach.
- ✗
Use AWS Schema Conversion Tool (SCT) to convert the schema before migration.
Why it's wrong here
AWS Schema Conversion Tool (SCT) is used for converting schemas from one database engine to another, but here the source is already Oracle, so schema conversion is not needed.
- ✓
Use AWS Database Migration Service (DMS) with ongoing replication to keep the target in sync.
Why this is correct
AWS DMS with ongoing replication allows continuous data replication with minimal downtime, making it suitable for this requirement.
- ✓
Use AWS Snowball to transfer the initial data load to Amazon S3, then use DMS to migrate the remaining changes.
Why this is correct
AWS Snowball can be used for the initial large data transfer to avoid prolonged network transfer, and then DMS can handle the remaining ongoing changes.
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