DP-900 Practice Question: Describe considerations for working with non-relational data on Azure
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. 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 develops an IoT device registry that stores device metadata as JSON documents. Each device has a unique DeviceID, and the attributes vary per device type (e.g., sensors, actuators). The application requires low-latency reads by DeviceID and needs global distribution to support devices worldwide. The team wants to use a fully managed NoSQL database in Azure. Which API should they choose for Azure Cosmos DB?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SQL API
The SQL API (formerly DocumentDB API) is the native API for Azure Cosmos DB, providing full support for querying JSON documents with a SQL-like syntax. It offers the lowest latency reads by ID (point reads) and native global distribution, making it ideal for a device registry where each device has a unique DeviceID and variable attributes. The SQL API also supports indexing all properties automatically, which is critical for the varied device types.
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.
✓
SQL API
Why this is correct
Correct. The SQL API is the native API for JSON documents in Cosmos DB, offering rich querying and global distribution.
Related concept
Read the scenario before looking for a memorised answer.
✗
MongoDB API
Why it's wrong here
Incorrect. While it supports JSON-like documents, it is better suited for migrating existing MongoDB apps. The SQL API is more native.
✗
Cassandra API
Why it's wrong here
Incorrect. The Cassandra API is for wide-column NoSQL workloads, not ideal for variable JSON documents.
✗
Table API
Why it's wrong here
Incorrect. The Table API is for key-value store scenarios, not for rich JSON documents with nested attributes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose the MongoDB API because they associate JSON documents with MongoDB, but the SQL API is the native Cosmos DB API that provides the best performance and feature integration for JSON workloads on Azure.
Trap categories for this question
Scenario analysis trap
Incorrect. The Table API is for key-value store scenarios, not for rich JSON documents with nested attributes.
Detailed technical explanation
How to think about this question
Under the hood, the SQL API uses a resource token model and a hierarchical namespace (database -> container -> item), where each JSON document is stored as an item with automatic indexing of all properties. Point reads by DeviceID leverage the partition key (set to /DeviceID) to achieve single-digit millisecond latency at any scale, as Cosmos DB routes the request directly to the physical partition hosting the data. In a real-world scenario, a global device registry with millions of devices can use the SQL API's multi-region writes to ensure low-latency writes from any region, while maintaining consistency via bounded staleness or session consistency.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: SQL API — The SQL API (formerly DocumentDB API) is the native API for Azure Cosmos DB, providing full support for querying JSON documents with a SQL-like syntax. It offers the lowest latency reads by ID (point reads) and native global distribution, making it ideal for a device registry where each device has a unique DeviceID and variable attributes. The SQL API also supports indexing all properties automatically, which is critical for the varied device types.
What should I do if I get this DP-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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