Amazon Aurora PostgreSQL-Compatible Edition is the correct choice because it delivers a fully managed, high-availability database solution that handles complex joins, stored procedures, and OLTP workloads while eliminating Oracle’s licensing costs. Aurora achieves this through a distributed, fault-tolerant storage subsystem that replicates data across three Availability Zones, providing automatic failover and up to 15 read replicas—meeting the single-Region high availability requirement without the overhead of commercial databases. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your ability to distinguish between managed services that reduce licensing burden and those that don’t; a common trap is choosing RDS for Oracle or SQL Server, which still incur license fees, or selecting DynamoDB, which lacks native stored procedure support. Remember the key trade-off: when the question emphasizes “replace Oracle” and “minimize licensing costs,” Aurora PostgreSQL is the fully managed, open-source-compatible answer. Memory tip: “Aurora for Oracle exit—no license, high uptime, complex joins fit.”
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A financial services company is migrating an on-premises Oracle database to AWS. The database supports an OLTP application with complex joins, stored procedures, and requires high availability within a single Region. The company wants to minimize licensing costs and use a fully managed service. Which AWS database service should they choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon Aurora PostgreSQL-Compatible Edition
Amazon Aurora PostgreSQL-Compatible Edition is the correct choice because it is a fully managed, high-availability database service that supports complex joins, stored procedures, and OLTP workloads while minimizing licensing costs. Aurora provides built-in replication across three Availability Zones, automatic failover, and up to 15 read replicas, meeting the high availability requirement without the licensing overhead of commercial databases like Oracle.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 DynamoDB
Why it's wrong here
DynamoDB is NoSQL and does not support complex joins or stored procedures.
✗
Amazon RDS for Oracle
Why it's wrong here
RDS Oracle would still require Oracle licensing, increasing costs.
✗
AWS Database Migration Service (DMS)
Why it's wrong here
DMS is a migration service, not a database.
✓
Amazon Aurora PostgreSQL-Compatible Edition
Why this is correct
Aurora PostgreSQL is fully managed, supports complex joins and stored procedures, and provides high availability with Multi-AZ.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Amazon RDS for Oracle (Option B) because it supports Oracle features directly, overlooking the explicit requirement to minimize licensing costs and the fact that Aurora PostgreSQL can handle complex joins and stored procedures without Oracle licensing fees.
Detailed technical explanation
How to think about this question
Aurora PostgreSQL uses a distributed, shared-storage architecture where the storage layer is replicated across three Availability Zones with 6 copies of data, enabling automatic failover in under 30 seconds without data loss. It supports Oracle-compatible stored procedures via PL/pgSQL and can handle complex joins efficiently with its query optimizer and buffer cache, making it a drop-in replacement for many Oracle workloads after minor schema adjustments. In real-world migrations, Aurora PostgreSQL often reduces total cost of ownership by 90% compared to commercial databases due to its pay-per-request pricing and lack of licensing fees.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon Aurora PostgreSQL-Compatible Edition — Amazon Aurora PostgreSQL-Compatible Edition is the correct choice because it is a fully managed, high-availability database service that supports complex joins, stored procedures, and OLTP workloads while minimizing licensing costs. Aurora provides built-in replication across three Availability Zones, automatic failover, and up to 15 read replicas, meeting the high availability requirement without the licensing overhead of commercial databases like Oracle.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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