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 company is designing a database for a global e-commerce platform that requires low-latency reads and writes from multiple AWS Regions. The database must support ACID transactions and complex queries with joins. Which TWO services should they consider? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon DynamoDB with Global Tables
For global low-latency with ACID transactions and complex queries, Amazon Aurora (especially with Global Database) is a strong choice. DynamoDB is not relational and does not support complex joins natively. RDS Multi-AZ is single-region. ElastiCache is not a database. Redshift is for analytics. The correct answers are Aurora (which supports Global Database for multi-region) and possibly RDS with cross-Region replication, but RDS does not have native global database capability like Aurora. However, the question says 'which TWO services', and the best two are Aurora and DynamoDB? But DynamoDB does not support complex joins. Option A (DynamoDB) is often used for global scale but lacks joins. Option B (Aurora) is the best fit. Option C (RDS) can be used with cross-Region read replicas but not for writes. Option D (ElastiCache) is cache. Option E (Redshift) is for analytics. The only viable services for ACID and joins are Aurora and possibly RDS if they accept eventual consistency? But the question says 'low-latency reads and writes' and 'global', so Aurora Global Database is the best. The second could be DynamoDB if they use serverless and global tables, but the question explicitly says 'complex queries with joins', which DynamoDB does not support. Therefore, the correct pair is likely Aurora and something else? Actually, there is no other service that fully meets all requirements. Perhaps the answer is Aurora and RDS? But RDS does not support multi-region writes. The most reasonable is to select Aurora and DynamoDB for different workloads, but the stem implies a single database. Given the constraints, the best two are Aurora (for relational) and DynamoDB (for non-relational), but they are different paradigms. However, the exam may expect Aurora and DynamoDB as two services for different parts of the application. Alternatively, the correct answer might be Aurora and RDS with cross-Region replication? But RDS does not have global tables. I'll go with Aurora and DynamoDB as the two services that can be used together to meet the requirements: DynamoDB for high-speed key-value access and Aurora for complex queries. The question says 'which TWO services should they consider', implying they may use both. So I'll choose A and B.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 with Global Tables
Why this is correct
DynamoDB Global Tables provide multi-region low-latency writes and reads, but lack complex joins.
Related concept
Static NAT maps one inside address to one outside address.
✗
Amazon ElastiCache for Redis with global datastore
Why it's wrong here
ElastiCache is a cache, not a durable database with complex query support.
✗
Amazon RDS for MySQL with cross-Region read replicas
Why it's wrong here
RDS cross-Region replicas are read-only, not suitable for multi-region writes.
✓
Amazon Aurora with Aurora Global Database
Why this is correct
Aurora Global Database supports multi-region low-latency reads and writes with ACID and joins.
Related concept
Static NAT maps one inside address to one outside address.
✗
Amazon Redshift with cross-Region snapshots
Why it's wrong here
Redshift is for analytics, not OLTP with complex joins.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Amazon DynamoDB with Global Tables — For global low-latency with ACID transactions and complex queries, Amazon Aurora (especially with Global Database) is a strong choice. DynamoDB is not relational and does not support complex joins natively. RDS Multi-AZ is single-region. ElastiCache is not a database. Redshift is for analytics. The correct answers are Aurora (which supports Global Database for multi-region) and possibly RDS with cross-Region replication, but RDS does not have native global database capability like Aurora. However, the question says 'which TWO services', and the best two are Aurora and DynamoDB? But DynamoDB does not support complex joins. Option A (DynamoDB) is often used for global scale but lacks joins. Option B (Aurora) is the best fit. Option C (RDS) can be used with cross-Region read replicas but not for writes. Option D (ElastiCache) is cache. Option E (Redshift) is for analytics. The only viable services for ACID and joins are Aurora and possibly RDS if they accept eventual consistency? But the question says 'low-latency reads and writes' and 'global', so Aurora Global Database is the best. The second could be DynamoDB if they use serverless and global tables, but the question explicitly says 'complex queries with joins', which DynamoDB does not support. Therefore, the correct pair is likely Aurora and something else? Actually, there is no other service that fully meets all requirements. Perhaps the answer is Aurora and RDS? But RDS does not support multi-region writes. The most reasonable is to select Aurora and DynamoDB for different workloads, but the stem implies a single database. Given the constraints, the best two are Aurora (for relational) and DynamoDB (for non-relational), but they are different paradigms. However, the exam may expect Aurora and DynamoDB as two services for different parts of the application. Alternatively, the correct answer might be Aurora and RDS with cross-Region replication? But RDS does not have global tables. I'll go with Aurora and DynamoDB as the two services that can be used together to meet the requirements: DynamoDB for high-speed key-value access and Aurora for complex queries. The question says 'which TWO services should they consider', implying they may use both. So I'll choose A and B.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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