DBS-C01 Deployment and Migration Practice Question
A company needs to migrate a 3 TB Amazon RDS for SQL Server database to Amazon RDS for PostgreSQL. The migration must be automated and repeatable with minimal manual intervention. Which combination of services should be used?
⚠ Common exam trap
It's easy for candidates to assume DMS alone can handle both schema conversion and data migration, but DMS does not perform schema transformation for heterogeneous migrations; schema conversion must be done separately with SCT before DMS can replicate the data.
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 Schema Conversion Tool (SCT) to convert the schema, then use AWS DMS to migrate the data.
AWS Schema Conversion Tool (SCT) handles the schema conversion from SQL Server to PostgreSQL, which is necessary due to incompatible data types, stored procedures, and indexes. AWS Database Migration Service (DMS) then performs the continuous data migration with minimal downtime, supporting both full load and ongoing replication. This combination automates the migration process and makes it repeatable via AWS CloudFormation or DMS task templates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AWS SCT to convert the schema and export data to PostgreSQL-compatible format, then import.
Why it's wrong here
SCT does not handle ongoing data migration.
- ✓
Use AWS Schema Conversion Tool (SCT) to convert the schema, then use AWS DMS to migrate the data.
Why this is correct
SCT handles schema conversion, DMS handles data migration.
- ✗
Use AWS DMS with native SQL Server CDC to migrate directly to PostgreSQL.
Why it's wrong here
DMS cannot automatically convert schema between different engines.
- ✗
Use Microsoft Data Migration Assistant to assess and migrate to PostgreSQL.
Why it's wrong here
Data Migration Assistant is for SQL Server to SQL Server.
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