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  4. Azure
  5. DP-420
Azure专家级数据

Microsoft Certified: Azure Cosmos DB Developer Specialty (DP-420)

验证您设计和实现 Azure Cosmos DB 解决方案的专业技能。涵盖数据建模、分区策略和性能优化。

Try the first chapter freePractice questions
50
Official exam questions
120 min
Exam duration
700/1000
Passing score
JR ACADEMY / CERTIFICATION PREP

JR Academy practice bank

120practice questions
Build your foundation6 learning chapters
Practice with purposeFocused practice · answer explanations
Test your readinessMock exams · review

120 practice questions available

OverviewLearning pathFAQReviews
01

Understand the certification

认证概述

Microsoft DP-420（Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB）是 Azure 数据方向里唯一专攻 NoSQL 的 Specialty 认证。Azure Cosmos DB 是多模型全球分布式 NoSQL 数据库，支持 5 种 API（Core SQL、MongoDB、Cassandra、Gremlin、Table）。这张证书证明你能设计读多写多的全球应用数据层：怎么选 partition key 避免热点、怎么在 5 种一致性级别（Strong / Bounded Staleness / Session / Consistent Prefix / Eventual）之间做 trade-off、怎么用 Change Feed 构建事件驱动架构、以及怎么在 RU/s（Request Units）成本和性能之间调优。

考试领域与权重（基于 Microsoft 官方 DP-420 Skills Outline）

  • Design and implement data models（35-40%）：文档层级设计、Embedded vs Referenced、Partition key 选型（避免 hot partition）、多对多关系建模、分析型负载 vs 事务型负载的数据模型
  • Design and implement data distribution（5-10%）：Global Distribution（多 region 复制）、Multi-Region Writes、Consistency Levels 的 5 档选型
  • Integrate an Azure Cosmos DB solution（5-10%）：Change Feed 与 Azure Functions、Azure Synapse Link（HTAP 混合事务分析）、Cosmos DB + Azure Search 全文检索
  • Optimize an Azure Cosmos DB solution（15-20%）：RU/s 消耗分析（SDK Query Metrics）、索引策略（Automatic vs Manual vs Composite Index）、Cache 策略、Autoscale vs Manual Throughput
  • Maintain an Azure Cosmos DB solution（25-30%）：监控（Azure Monitor / Cosmos DB insights）、Backup / Restore（Periodic / Continuous）、安全（RBAC / Private Endpoint / Always Encrypted / Customer-Managed Keys）、SDK 错误处理与重试

适合人群

  • Azure Data Developer — 在 Azure 上设计 NoSQL 数据层
  • Backend Developer — 做高并发、全球分布式应用
  • Solution Architect — 评估 SQL 数据库 vs Cosmos DB 选型
  • 已持 Azure Fundamentals（AZ-900）或 Developer Associate（AZ-204）的候选人
  • 有 MongoDB / Cassandra / DynamoDB 背景要转 Cosmos DB 生态

Exam at a glance

Exam code
DP-420
Provider
Azure
Format
Single choice / Multiple select / True/False / Drag and drop
Language
English / 中文(简体) / 日本語 / 한국어 / Français / Deutsch / Español
Validity
1 years
Exam fee
$165
Official certification page

Skills in focus

Azure Cosmos DBCore (SQL) APIMongoDB APIPartition Key DesignRequest Units (RU/s)Consistency LevelsChange FeedStored Procedures / TriggersAzure Synapse LinkGlobal DistributionMulti-Region WritesIndexing PolicyCosmos DB SDK (C# / Node.js / Python)Azure Functions IntegrationPeriodic / Continuous BackupRBAC / Private EndpointCustomer-Managed Keys

Learning outcomes

  • 通过 Microsoft DP-420 Azure Cosmos DB Developer Specialty 认证考试
  • 独立设计多对多关系、热点避让、跨文档查询的 Cosmos DB 数据模型
  • 选型合理的 partition key 避免生产热点（会对比真实业务场景的多种方案）
  • 在 5 档一致性级别之间做 trade-off，结合延迟、可用性、RU 成本
  • 用 Change Feed + Azure Functions 构建事件驱动应用
  • 用 Synapse Link 零 ETL 跑 OLAP 分析负载（不干扰 OLTP）
  • 监控并优化 RU/s 消耗，Autoscale 选型与成本控制
  • 为进阶 Azure Data Engineer（DP-203）或 Solutions Architect（AZ-305）打下数据层基础

Who this is for

  • Azure Data Developer — 在 Azure 上设计 NoSQL 数据层
  • Backend Developer — 做高并发、全球分布式应用
  • Solution Architect — 评估 SQL 数据库 vs Cosmos DB 选型
  • 已持 Azure Fundamentals（AZ-900）或 Developer Associate（AZ-204）的候选人
  • 有 MongoDB / Cassandra / DynamoDB 背景要转 Cosmos DB 生态

Before you start

  • 12+ 个月 Azure 开发或数据库工作经验
  • 熟悉至少一种 NoSQL 数据库（MongoDB / Cassandra / DynamoDB）
  • 能写 C# / Python / Node.js 任一语言并调过 SDK
  • 理解分布式系统的 CAP 定理与一致性概念
  • 有 Azure 订阅（可用 Cosmos DB Free Tier：1000 RU/s + 25GB 永久免费）
  • 推荐先过 Microsoft Learn DP-420 官方学习路径（12 个模块）

What do you still need before the Azure Cosmos DB Developer Specialty exam?

Tell us what you do now and where you want to go. See your gaps in skills, evidence, experience, expression and positioning, and what to work on first. No sign-in needed.

Compare with my situation
02

Your learning path

6 chapters

01DP-420 考试概述与备考指南Free02数据模型设计与实现Free03解决方案优化与维护75 min04集成与数据分布实战60 min05维护与运维综合复习45 min06考前冲刺与实战演练45 min
View the full learning path

Plan your preparation

Learning hours
40h
With relevant experience
6-8 weeks
Starting from scratch
10-14 weeks
Daily study
1-2h

Included in your preparation

  • 按 Microsoft DP-420 官方 Skills Outline 五大领域切章节（数据建模权重最大 35-40%）
  • 120 道练习题偏 Partition key 选型和 RU/s 调优场景（不是知识点死记题）
  • 数据建模章节讲透 Embedded vs Referenced 决策框架，避免生产后想改分区键的悲剧
  • 一致性级别章节给出 5 档（Strong / Bounded Staleness / Session / Consistent Prefix / Eventual）的真实应用场景对比
  • Change Feed 章节给出事件驱动架构实战（Cosmos DB → Azure Functions → 下游消费）
  • Synapse Link 章节覆盖 HTAP 混合事务分析的 zero-ETL 实战
  • 50 题 120 分钟仿真模拟，贴合 Specialty 级考场节奏

Preparation tips

  • 50 题 120 分钟，平均每题 2 分钟，合理分配时间
  • 及格分 700/1000，不确定的题先标记跳过，回头再做
  • 排除法非常有用 — 先排掉明显错误的选项，剩下的再分析
  • 多选题会告诉你选几个，仔细看题目要求

Common mistakes

  • 没有读完所有选项就选答案 — 题目经常有"最佳"答案和"正确但不最佳"的干扰项
  • 备考只刷题不理解原理 — 考试场景题需要理解底层概念
  • 忽略时间管理 — 在难题上卡太久，导致后面简单题没时间做
03

Before you register

How difficult is the DP-420 exam?

DP-420 is a Specialty-level certification. Some practical experience is recommended, with 4-8 weeks of systematic preparation.

How long is the DP-420 certification valid?

The DP-420 certification is valid for one year and requires passing a renewal assessment to maintain certification status. Microsoft will notify you in advance of the renewal period.

How much does the DP-420 exam cost?

The DP-420 exam costs $165 USD. The exam is 120 minutes long and requires a score of 700/1000 to pass.

04

Learner experiences

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Done reading? Next steps

What do you still need before the Azure Cosmos DB Developer Specialty exam?

Tell us what you do now and where you want to go. See your gaps in skills, evidence, experience, expression and positioning, and what to work on first. No sign-in needed.

Compare with my situation
  • SkillPractise Azure Cosmos DB Developer Specialty by exam domainQuestions are grouped by the official exam domains, so you can see which domain still needs work.Open the question bank →
  • SkillAzure Cosmos DB Developer Specialty learning pathWork through the exam scope chapter by chapter, then come back to the questions.See the learning path →

Start with the first chapter.

2 free chapters · Full preparation from $39

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