The answer is Amazon RDS for PostgreSQL for structured data, with Amazon S3 for images and Amazon CloudFront for delivery. This combination is the most efficient because it separates the storage of hybrid storage structured and unstructured data into services optimized for each: RDS provides full SQL querying for relational data like patient names and ages, while S3 offers durable, scalable object storage for medical images, and CloudFront caches those images at edge locations for low-latency HTTPS serving. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of when to use relational databases versus object storage versus content delivery, and it commonly appears as a trap where candidates choose DynamoDB (which lacks SQL) or EFS (a file system not designed for high-throughput image serving). A quick memory tip: think of the three S’s—SQL for structured, S3 for static, and speed via CloudFront.
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 healthcare application requires storing patient records that include structured data (e.g., name, age) and unstructured data (e.g., medical images). The application needs to query structured data with SQL and serve images via HTTPS. Which combination of AWS services provides the MOST efficient design?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon RDS for PostgreSQL for structured data and Amazon S3 for images with Amazon CloudFront
Option B is correct: RDS stores structured data with SQL, S3 stores images, and CloudFront caches images for low-latency access. Option A is wrong because DynamoDB does not support SQL. Option C is wrong because EFS is a file system, not optimized for image serving. Option D is wrong because Redshift is a data warehouse, not suitable for transactional queries.
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 for structured data and Amazon S3 for images with DynamoDB Accelerator (DAX)
Why it's wrong here
DynamoDB does not support SQL queries.
✗
Amazon RDS for MySQL for structured data and Amazon EFS for images
Why it's wrong here
EFS is a file system, not designed for high-throughput image serving.
✓
Amazon RDS for PostgreSQL for structured data and Amazon S3 for images with Amazon CloudFront
Why this is correct
RDS provides SQL; S3 and CloudFront serve images efficiently.
Related concept
Static NAT maps one inside address to one outside address.
✗
Amazon Redshift for structured data and Amazon S3 for images
Why it's wrong here
Redshift is for analytics, not transactional SQL queries.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 RDS for PostgreSQL for structured data and Amazon S3 for images with Amazon CloudFront — Option B is correct: RDS stores structured data with SQL, S3 stores images, and CloudFront caches images for low-latency access. Option A is wrong because DynamoDB does not support SQL. Option C is wrong because EFS is a file system, not optimized for image serving. Option D is wrong because Redshift is a data warehouse, not suitable for transactional queries.
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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Question Discussion
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