DBS-C01 Deployment and Migration Practice Question
A company is migrating an on-premises PostgreSQL database to Amazon RDS for PostgreSQL. The migration must have minimal downtime. Which TWO AWS services should be used together to achieve this?
⚠ Common exam trap
Candidates often confuse AWS DataSync or CloudEndure Migration as viable for database migration, but neither supports the logical replication and schema conversion required for minimal-downtime PostgreSQL to RDS migration, while DMS and SCT are the only services that directly address both schema conversion and ongoing data 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 (AWS DMS)
AWS Database Migration Service (DMS) is used for the actual data migration with minimal downtime, supporting ongoing replication via change data capture (CDC) from the on-premises PostgreSQL database to Amazon RDS for PostgreSQL. AWS Schema Conversion Tool (SCT) is required to convert the source database schema and code to match the target RDS for PostgreSQL, identifying and resolving any compatibility issues. Together, SCT pre-processes the schema and DMS performs the data migration with replication, enabling a near-zero 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.
- ✗
AWS DataSync
Why it's wrong here
DataSync is for moving files, not databases.
- ✗
AWS CloudEndure Migration
Why it's wrong here
CloudEndure is for server migration, not database-specific.
- ✓
AWS Database Migration Service (AWS DMS)
Why this is correct
DMS provides ongoing replication for minimal downtime.
- ✗
AWS Direct Connect
Why it's wrong here
Direct Connect provides dedicated network, but is not a migration service.
- ✓
AWS Schema Conversion Tool (AWS SCT)
Why this is correct
SCT converts the schema for compatibility.
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Variation 1. A company is migrating an on-premises PostgreSQL database to Amazon RDS for PostgreSQL. The migration must be completed with minimal downtime. Which TWO AWS services should be used together?
easy- A.AWS Snowball
- ✓ B.AWS Database Migration Service (DMS)
- C.AWS CloudEndure Migration
- ✓ D.AWS Schema Conversion Tool (SCT)
- E.AWS Direct Connect
Why B: AWS Database Migration Service (DMS) is the correct choice because it supports ongoing replication from an on-premises PostgreSQL source to Amazon RDS for PostgreSQL, enabling near-zero downtime migrations. DMS uses change data capture (CDC) to continuously replicate transactions after an initial full load, allowing the target database to stay synchronized until cutover.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.