DP-203 Design and implement data storage Practice Question
A data engineer needs to store JSON documents that are frequently updated by multiple users concurrently. The solution must support optimistic concurrency control and have built-in indexing on all fields. Which Azure data store should be used?
⚠ Common exam trap
Candidates often choose Azure SQL Database because they associate concurrency control with relational databases, overlooking that Cosmos DB is purpose-built for JSON documents with automatic indexing and native optimistic concurrency via ETags, which is more aligned with the requirements than a relational store.
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 Cosmos DB (SQL API)
Azure Cosmos DB (SQL API) is the correct choice because it natively supports optimistic concurrency control via ETags (HTTP entity tags) and provides automatic indexing of all fields without requiring manual index management. This makes it ideal for storing JSON documents that are frequently updated by multiple concurrent users, as it ensures conflict detection and resolution while maintaining high performance.
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 Cosmos DB (SQL API)
Why this is correct
Cosmos DB supports JSON documents, optimistic concurrency, and automatic indexing.
- ✗
Azure Blob Storage
Why it's wrong here
Blob Storage does not support concurrent updates at the document level.
- ✗
Azure SQL Database
Why it's wrong here
SQL Database is relational, not optimized for JSON documents with automatic indexing.
- ✗
Azure Table Storage
Why it's wrong here
Table Storage does not support JSON natively and has limited indexing.
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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.