DBS-C01 Management and Operations Practice Question
A company is migrating an on-premises Oracle database to Amazon RDS for Oracle. The database is 2 TB in size and has a 24/7 uptime requirement. The migration must have minimal downtime and support ongoing replication. Which TWO services or features should the specialist use to accomplish 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
✓
An AWS DMS replication instance.
Options C and E are correct. Option C: An AWS DMS replication instance is required to run AWS DMS tasks, including migration with ongoing replication. Option E: AWS DMS with change data capture (CDC) enables ongoing replication with minimal downtime. Option D is incorrect because AWS Schema Conversion Tool (AWS SCT) is used for heterogeneous migrations (e.g., Oracle to PostgreSQL), not for homogeneous Oracle-to-Oracle migrations. Option A is incorrect because Oracle Data Guard is not supported for direct replication to Amazon RDS for Oracle; DMS is used instead. Option B is incorrect because cross-Region automated backups are a backup feature, not a migration tool for minimal downtime 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.
- ✗
Oracle Data Guard to replicate to RDS.
Why it's wrong here
RDS does not support Oracle Data Guard.
- ✗
Amazon RDS cross-Region automated backups.
Why it's wrong here
Automated backups are for disaster recovery, not migration.
- ✓
An AWS DMS replication instance.
Why this is correct
An AWS DMS replication instance is the compute resource that runs DMS tasks, including full load and ongoing CDC replication, enabling minimal downtime migration.
- ✗
AWS Schema Conversion Tool (AWS SCT).
Why it's wrong here
AWS Schema Conversion Tool (AWS SCT) is used for heterogeneous database migrations (e.g., Oracle to PostgreSQL or MySQL). For a homogeneous Oracle-to-Oracle migration to RDS for Oracle, SCT is not required.
- ✓
AWS Database Migration Service (AWS DMS) with change data capture (CDC).
Why this is correct
AWS DMS with change data capture (CDC) captures ongoing changes from the source Oracle database and applies them to the target RDS for Oracle, allowing continuous replication with minimal downtime.
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