Question 950 of 1,711
DEA-C01 Data Store Management Practice Question
A data engineer needs to migrate an on-premises PostgreSQL database to Amazon RDS for PostgreSQL. The database is 2 TB and has a continuous stream of write operations. The migration should minimize downtime. Which AWS service should be used?
⚠ Common exam trap
Candidates often choose AWS DataSync (Option A) because they confuse it with a database migration tool, but DataSync cannot replicate live transactional changes and is meant for file or object storage, not relational databases with ongoing writes.
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 Database Migration Service (DMS) is the correct choice because it supports ongoing replication (change data capture) from an on-premises PostgreSQL source to Amazon RDS for PostgreSQL, enabling a near-zero downtime migration. DMS can handle the 2 TB dataset and continuous write stream by performing a full load followed by continuous replication of changes until the cutover. Other services lack the ability to perform live, transactional replication with minimal interruption.
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 file transfers, not database replication.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
DMS supports ongoing replication and minimal downtime for database migrations.
- ✗
AWS Snowball Edge
Why it's wrong here
Snowball is for offline data transfer, not suitable for continuous writes.
- ✗
AWS Glue
Why it's wrong here
Glue is an ETL service, not designed for database migration with replication.
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Last reviewed: Jul 4, 2026
This DEA-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 DEA-C01 exam.
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