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Exam Code: DEX-450
Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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DEX-450

Check Updated on: Jul 26, 2026

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Salesforce DEX-450 certification exam is designed for professionals who specialize in programmatic development using Apex and Visualforce in the Lightning Experience. DEX-450 exam is intended to validate a candidate's knowledge and skills in designing, developing, testing, and deploying custom business logic, interfaces, and integrations using these programming languages.

Reference: https://trailhead.salesforce.com/en/academy/classes/dex450-build-applications-programmatically-on-the-salesforce-platform/

Salesforce DEX-450 is an exam that focuses on programmatic development using Apex and Visualforce in the Lightning Experience. It is a certification that is designed for developers who want to demonstrate their skills and knowledge in building custom applications on the Salesforce platform. DEX-450 exam tests the developer's ability to create, debug, test and deploy Apex code, Visualforce pages, and Lightning components.

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Salesforce DEX-450 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Apex Fundamentals10%- Apex Basics
  • 1. Apex variables and data types
  • 2. Using SOQL to query Salesforce data
  • 3. DML operations (insert, update, delete, etc.)
  • 4. Apex operators and control flow statements
- Apex Primitives
  • 1. Integer, Double, Long, String, Boolean types
  • 2. Date, Datetime, Time classes
  • 3. ID and sObject types
Topic 2: Apex Triggers12%- Trigger Best Practices
  • 1. Recursive trigger prevention
  • 2. Handler class patterns
  • 3. One trigger per object pattern
- Trigger Syntax and Context Variables
  • 1. Trigger.old and Trigger.new context variables
  • 2. Trigger.newMap and Trigger.oldMap
  • 3. Trigger events (before insert, after insert, etc.)
Topic 3: Working with Data - SOQL and SOSL15%- SOQL (Salesforce Object Query Language)
  • 1. Basic SOQL queries
  • 2. Relationship queries (parent-child, child-parent)
  • 3. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
  • 4. Query options (LIMIT, ORDER BY, WHERE)
- SOSL (Salesforce Object Search Language)
  • 1. SOSL syntax and use cases
  • 2. Returning sObjects from SOSL
Topic 4: Apex Testing13%- Testing Best Practices
  • 1. Assert statement usage
  • 2. Using seeAllData=false for isolated tests
  • 3. Coverage requirements (75% for deployment)
- Test Classes
  • 1. Test.startTest() and Test.stopTest()
  • 2. @isTest annotation
  • 3. Test data creation methods
Topic 5: Visualforce Pages8%- VF Page Basics
  • 1. component structure
  • 2. Visualforce expressions
  • 3. Controllers and controller extensions
- VF Standard Components
  • 1. Action methods and pageReference
  • 2. , ,
  • 3. ,
Topic 6: Apex Transaction Management10%- Governor Limits
  • 1. SOQL query limits
  • 2. DML statement limits
  • 3. CPU time and heap size limits
- Transaction Control
  • 1. Savepoint and rollback
  • 2. Database methods with allOrNone parameter
  • 3. System.debug() usage
Topic 7: Apex Classes and Interfaces12%- Apex Classes
  • 1. Class structure (attributes, methods, constructors)
  • 2. Access modifiers (public, private, protected, global)
  • 3. Inheritance and virtual/abstract classes
- Apex Interfaces
  • 1. When to use interfaces
  • 2. Interface definition and implementation
Topic 8: Asynchronous Apex10%- Future Methods
  • 1. AsyncRequestLimit exceeded handling
  • 2. @future annotation
- Batch Apex
  • 1. Database.Batchable interface
  • 2. start(), execute(), and finish() methods
  • 3. Database.Stateful

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