200+ Free DP-420 Practice Questions

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Question 1

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An e-commerce app always displays each order together with its line items, and the line items are never queried independently. How should you model the data in Azure Cosmos DB for NoSQL?

Store line items in a separate container keyed by productId

Embed the line items inside the order document

Store each line item in Azure Table Storage

Create one container per line item type

to track

2026 Statistics

Key Facts: DP-420 Exam

700/1000

Passing Score

Microsoft

40-60

Typical Questions

Microsoft certification exams

100 min

Exam Duration

DP-420 certification page

Current Domains

Skills measured Jan 27, 2025

12 months

Renewal Cycle

Microsoft certification page

~$165

Typical U.S. Fee

Microsoft exam pricing guidance

DP-420 is Microsoft’s Azure Cosmos DB specialty certification for developers. The current skills-measured blueprint, last updated January 27, 2025, weights the exam as follows: Design and implement data models (35-40%), Design and implement data distribution (5-10%), Integrate an Azure Cosmos DB solution (5-10%), Optimize an Azure Cosmos DB solution (15-20%), and Maintain an Azure Cosmos DB solution (25-30%). Microsoft’s current exam-experience policy says most certification exams typically contain 40-60 questions, DP-420 gives you 100 minutes, technical exams require a scaled 700/1000 to pass, and pricing varies by region with U.S. technical exams commonly around $165.

Sample DP-420 Practice Questions

Try these sample questions to test your DP-420 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1An e-commerce app always displays each order together with its line items, and the line items are never queried independently. How should you model the data in Azure Cosmos DB for NoSQL?

A.Store line items in a separate container keyed by productId

B.Embed the line items inside the order document

C.Store each line item in Azure Table Storage

D.Create one container per line item type

Explanation: Embedding works best for one-to-few relationships that are always read together. It reduces joins in the application layer and lets a single point read return the whole order aggregate.

2A social media application stores posts with potentially millions of comments per post. Comments are loaded separately and grow without a practical upper bound. Which modeling approach is best?

A.Embed all comments in the post document

B.Store each post in a separate Azure SQL database

C.Store comments separately and relate them to the post

D.Create a new Cosmos DB account for each post

Explanation: Unbounded collections should not be embedded because document size and update costs would grow continuously. Storing comments as separate items lets you scale writes and reads independently while still relating them to the post.

3A checkout workflow must create an order header and several order-event items atomically. All items can share the same partition key value. Which feature should you use?

A.Integrated cache

B.Transactional batch

C.Analytical store

D.Automatic failover

Explanation: Transactional batch provides ACID semantics for multiple operations within a single logical partition. That makes it the right choice when the order header and related items must succeed or fail together.

4A shopping-cart document should be deleted automatically if the customer abandons the cart for 24 hours. Which feature should you enable?

A.Time to Live (TTL)

B.Multi-region writes

C.Integrated cache

D.Analytical store

Explanation: TTL automatically expires items after the configured time period. It is the standard Cosmos DB pattern for ephemeral data such as sessions, carts, and short-lived tokens.

5An IoT solution stores telemetry from millions of devices. Most reads and writes are scoped to a single device. Which partition key is the best starting choice?

A./firmwareVersion

B./deviceId

C./country

D./alertLevel

Explanation: A good partition key matches the dominant access pattern and has high cardinality. Device ID distributes data across many logical partitions while keeping single-device queries targeted.

6A team chooses `/country` as the partition key for a global user container with only 12 distinct countries represented. What is the main risk?

A.Queries will always require a composite index

B.The partition key has low cardinality and can create hot logical partitions

C.The container cannot be replicated to multiple regions

D.The SDK cannot perform point reads

Explanation: A low-cardinality partition key groups too much data and traffic into too few logical partitions. That increases the likelihood of hot partitions and uneven throughput consumption.

7A multitenant application often filters by tenant and then by user, and some tenants are much larger than others. Which design best helps distribute data while preserving tenant-based queries?

A.Use a hierarchical partition key such as tenantId then userId

B.Use `/isActive` as the partition key

C.Store each tenant in a separate field but no partition key

D.Use one container per user

Explanation: A hierarchical partition key can preserve the tenant-first access pattern while distributing large tenants more effectively across subpartitions. It is a better fit than a low-cardinality or operationally explosive design.

8A retailer has only 30 stores, but each store generates heavy order volume. Queries usually target a single store. Which partitioning adjustment is most likely to reduce hot partitions?

A.Use a synthetic key such as storeId plus a bucket suffix

B.Use `/storeOpen` as the partition key

C.Disable indexing

D.Move the data to analytical store only

Explanation: When the natural partition key has too few values, a synthetic key can spread load across more logical partitions. Adding a bucket suffix preserves a store-oriented access pattern while improving distribution.

9A new workload has highly variable traffic and the team wants throughput to scale automatically without manual intervention. Which throughput mode is the best fit?

A.Manual throughput

B.Autoscale throughput

C.Serverless compute in Azure Functions

D.Analytical store throughput

Explanation: Autoscale is designed for bursty workloads where RU demand fluctuates significantly. It helps reduce manual capacity management while still allowing the service to scale within the configured range.

10Several small containers in the same database have bursty workloads that rarely peak at the same time. Which design can let them share RU/s capacity most effectively?

A.Provision throughput at the database level

B.Create a dedicated gateway

C.Use separate Cosmos DB accounts

D.Disable automatic indexing

Explanation: Database-level throughput lets eligible containers share a common RU budget. This is useful when different containers spike at different times and you want to improve overall RU utilization.

About the DP-420 Exam

DP-420 validates your ability to design, implement, integrate, optimize, and maintain cloud-native applications that use Azure Cosmos DB for NoSQL. The current Microsoft blueprint emphasizes data-model and SDK design most heavily, then operational maintenance, with smaller but still important sections on distribution, integration, and performance tuning. Successful candidates are expected to know partitioning, consistency, change feed, indexing, query efficiency, security, monitoring, and multi-region design decisions well enough to apply them to scenario-driven questions.

Questions

50 scored questions

Time Limit

100 minutes

Passing Score

700/1000

Exam Fee

Varies by region (commonly about $165 USD in the U.S.) (Microsoft / Pearson VUE)

DP-420 Exam Content Outline

35-40%

Design and implement data models

Model containers and items, choose partition keys and throughput strategies, configure SDK clients and connectivity modes, write efficient SQL queries, perform point reads and transactional batch operations, and implement server-side JavaScript when the scenario benefits from it.

5-10%

Design and implement data distribution

Plan regional distribution, availability, failover, multi-region writes, and conflict-resolution behavior to meet latency, resilience, and write-availability requirements.

5-10%

Integrate an Azure Cosmos DB solution

Use analytical store and Synapse Link, connect Spark workloads, process change feed events, and integrate Cosmos DB with Azure Functions and adjacent Azure services.

15-20%

Optimize an Azure Cosmos DB solution

Interpret RU charges and diagnostics, tune queries, shape indexing policies, add composite or spatial indexes where justified, use integrated cache, and improve change feed and workload efficiency.

25-30%

Maintain an Azure Cosmos DB solution

Monitor metrics and logs, configure alerts, secure accounts with RBAC, networking, and customer-managed keys, manage backups and restores, automate deployments, and plan operational data movement or migration.

How to Pass the DP-420 Exam

What You Need to Know

Passing score: 700/1000
Exam length: 50 questions
Time limit: 100 minutes
Exam fee: Varies by region (commonly about $165 USD in the U.S.)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

DP-420 Study Tips from Top Performers

1Start with the current January 27, 2025 objective map. Design and implement data models is the largest domain and deserves the biggest share of your study time.

2Practice partition-key design with real scenarios. You need to spot hot partitions, cardinality problems, fan-out query risks, and tradeoffs between natural, synthetic, and hierarchical keys quickly.

3Know the cheapest read and write patterns cold: point reads versus SQL queries, patch versus replace, bulk versus transactional batch, and when optimistic concurrency with ETags helps.

4Learn how consistency, preferred regions, multi-region writes, and automatic failover interact so you can reason about latency and availability under failure.

5Tune indexing intentionally. Be able to explain when to exclude paths, add composite indexes, add spatial indexes, or keep the default indexing policy.

6Use change feed hands-on with Azure Functions or the change feed processor library so lease containers, processor scaling, and idempotent downstream handling feel concrete.

7Review operational tooling such as metrics, Insights, diagnostic logs, restore choices, RBAC, private endpoints, and customer-managed keys because the maintenance domain is heavily weighted.

8Treat integrated cache, analytical store, and Synapse Link as architecture choices with cost and latency tradeoffs, not just feature names to memorize.

9Complete all 200 practice questions and aim to score at least 80% consistently before scheduling.

Frequently Asked Questions

What is the DP-420 exam?

DP-420 is the Microsoft Azure Cosmos DB Developer Specialty certification exam. It measures whether you can design and implement data models and distribution, integrate Cosmos DB with other Azure services, optimize throughput and query performance, and maintain a secure, resilient Cosmos DB solution.

How many questions are on DP-420?

Microsoft does not publish a fixed question count for DP-420. Microsoft’s current exam-experience documentation says most certification exams typically contain 40-60 questions, and the DP-420 certification page gives you 100 minutes to complete the exam.

What changed on DP-420 in 2026?

As of March 9, 2026, Microsoft has not posted a new DP-420 skills-measured update in 2026. The current official blueprint was last updated on January 27, 2025. The current 2026 Microsoft exam-experience rules still apply, including Microsoft Learn access during role-based and specialty exams, 100-minute role-based exam timing without labs, and the current retake policy.

How hard is the DP-420 exam?

DP-420 is moderately difficult to challenging because it tests design judgment rather than rote feature recall. The hardest areas for many candidates are partition-key tradeoffs, RU and indexing optimization, change feed architecture, multi-region write behavior, and choosing the least-cost design that still meets latency, consistency, and resiliency goals.

How long should I study for DP-420?

Most candidates need about 50-80 focused study hours over 4-8 weeks. If you already build production workloads on Azure Cosmos DB for NoSQL, you may need less; if partitioning, indexing, change feed, Synapse Link, or multi-region design are newer to you, budget extra hands-on time.

Does the Azure Cosmos DB Developer Specialty certification expire?

Yes. Microsoft currently lists a 12-month renewal frequency for the certification. You can renew it for free by completing the online renewal assessment on Microsoft Learn before the credential expires.

Can I use Microsoft Learn during the DP-420 exam?

Yes. Microsoft’s current exam-experience policy allows Microsoft Learn access during associate, expert, and specialty exams. The timer keeps running while you browse Learn, so it works best as a quick reference rather than a substitute for preparation.