DBS-C01 Workload-Specific Database Design Practice Question
Which TWO database services are most suitable for workloads that require ACID transactions?
⚠ Common exam trap
Many candidates assume DynamoDB supports full ACID transactions because of its 'DynamoDB Transactions' feature, but those transactions are limited to a maximum of 25 items or 4 MB per transaction and do not provide the same isolation guarantees as a relational database, making it unsuitable for workloads requiring strict ACID compliance across many rows or tables.
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
✓
Amazon Aurora
Amazon Aurora is correct because it is a MySQL- and PostgreSQL-compatible relational database engine that provides full ACID (Atomicity, Consistency, Isolation, Durability) transaction support, including multi-statement transactions with commit and rollback. Aurora uses a distributed, fault-tolerant storage subsystem that replicates data across three Availability Zones, ensuring durability and consistency for transactional workloads.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Neptune
Why it's wrong here
Neptune supports ACID but is a graph database, not general-purpose.
- ✗
Amazon Timestream
Why it's wrong here
Timestream does not support ACID transactions.
- ✓
Amazon Aurora
Why this is correct
Aurora is a relational database with full ACID support.
- ✓
Amazon RDS for MySQL
Why this is correct
RDS MySQL supports ACID transactions.
- ✗
Amazon DynamoDB
Why it's wrong here
DynamoDB supports transactions but with limitations; not traditionally ACID for all operations.
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