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Salesforce DEX-450

DEX-450

Exam Code: DEX-450

Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience

Updated: Aug 03, 2026

Q&A Number: 202 Q&As

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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.

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

Salesforce DEX-450 Exam Syllabus Topics:

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

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