DP-203 Design and implement data storage Practice Question
Which TWO Azure services can be used to implement a polyglot persistence architecture for an e-commerce application that requires both a relational database for orders and a document database for product catalogs?
⚠ Common exam trap
Candidates often confuse Azure Table Storage with a document database, but Table Storage is a key-value store without native JSON support or rich querying, whereas Cosmos DB provides a true document database with SQL API and indexing.
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
✓
Azure SQL Database
Azure SQL Database is a relational database service that supports ACID transactions and structured querying, making it ideal for storing and managing e-commerce order data with strong consistency and referential integrity. Azure Cosmos DB is a multi-model NoSQL database that provides document database capabilities with flexible schemas and low-latency access, perfectly suited for product catalogs that require high read throughput and schema evolution. Together, they enable a polyglot persistence architecture by using the best storage model for each workload.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Azure Cache for Redis
Why it's wrong here
In-memory cache, not a durable data store.
- ✓
Azure SQL Database
Why this is correct
Suitable for relational data like orders.
- ✓
Azure Cosmos DB
Why this is correct
Supports document models for product catalogs.
- ✗
Azure Table Storage
Why it's wrong here
Key-value store, not document or relational.
- ✗
Azure Data Lake Storage Gen2
Why it's wrong here
File/object storage, not suitable for transactional data.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DP-203 practice question is part of Courseiva's free Microsoft 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 DP-203 exam.