Salesforce DEX-450 Exam : Programmatic Development using Apex and Visualforce in Lightning Experience

Salesforce DEX-450 exam
  • Exam Code: DEX-450
  • Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
  • Updated: Aug 18, 2026
  • Q & A: 202 Questions and Answers
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About Salesforce DEX-450 Exam Questions

Who should take the Salesforce DEX-450 Exam

This course is designed for programme developers starting on the Salesforce platform who require programming customizations on Apex and Visualforce business logic as well as on user interface layers. There are no prerequisites for Salesforce DEX-450 Exam.

  • Programmatic developers.

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What is the duration, language, and format of Salesforce DEX-450 Exam
  • This exam consists of 85 questions
  • There is a time limit of 120 minutes for the exam.
  • Passing score 80%
  • The type of questions is Multiple Choice and situation-based questions.
  • Certification Validity period : 3 years.
  • This exam is offered in only English.

The validity of the Salesforce DEX-450 certification is three years.

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

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Salesforce DEX-450 Exam Syllabus Topics:
SectionWeightObjectives
Topic 1: Asynchronous Apex10%- Future Methods
  • 1. @future annotation
  • 2. AsyncRequestLimit exceeded handling
- Batch Apex
  • 1. start(), execute(), and finish() methods
  • 2. Database.Stateful
  • 3. Database.Batchable interface
Topic 2: Apex Testing13%- Testing Best Practices
  • 1. Coverage requirements (75% for deployment)
  • 2. Assert statement usage
  • 3. Using seeAllData=false for isolated tests
- Test Classes
  • 1. Test.startTest() and Test.stopTest()
  • 2. Test data creation methods
  • 3. @isTest annotation
Topic 3: Apex Transaction Management10%- Transaction Control
  • 1. Database methods with allOrNone parameter
  • 2. Savepoint and rollback
  • 3. System.debug() usage
- Governor Limits
  • 1. DML statement limits
  • 2. SOQL query limits
  • 3. CPU time and heap size limits
Topic 4: Apex Classes and Interfaces12%- Apex Classes
  • 1. Inheritance and virtual/abstract classes
  • 2. Access modifiers (public, private, protected, global)
  • 3. Class structure (attributes, methods, constructors)
- Apex Interfaces
  • 1. Interface definition and implementation
  • 2. When to use interfaces
Topic 5: Apex Fundamentals10%- Apex Primitives
  • 1. Integer, Double, Long, String, Boolean types
  • 2. ID and sObject types
  • 3. Date, Datetime, Time classes
- Apex Basics
  • 1. Using SOQL to query Salesforce data
  • 2. Apex variables and data types
  • 3. DML operations (insert, update, delete, etc.)
  • 4. Apex operators and control flow statements
Topic 6: Working with Data - SOQL and SOSL15%- SOQL (Salesforce Object Query Language)
  • 1. Relationship queries (parent-child, child-parent)
  • 2. Basic SOQL queries
  • 3. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
  • 4. Query options (LIMIT, ORDER BY, WHERE)
- SOSL (Salesforce Object Search Language)
  • 1. Returning sObjects from SOSL
  • 2. SOSL syntax and use cases
Topic 7: Apex Triggers12%- Trigger Syntax and Context Variables
  • 1. Trigger.newMap and Trigger.oldMap
  • 2. Trigger.old and Trigger.new context variables
  • 3. Trigger events (before insert, after insert, etc.)
- Trigger Best Practices
  • 1. Handler class patterns
  • 2. One trigger per object pattern
  • 3. Recursive trigger prevention
Topic 8: Visualforce Pages8%- VF Page Basics
  • 1. Visualforce expressions
  • 2. Controllers and controller extensions
  • 3. component structure
- VF Standard Components
  • 1. ,
  • 2. , ,
  • 3. Action methods and pageReference

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