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

  • Exam Code: DEX-450
  • Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
  • Updated: Oct 05, 2026
  • Q & A: 202 Questions and Answers

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  • England - 70,400 POUND
  • United State - 105,100 USD
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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. AsyncRequestLimit exceeded handling
  • 2. @future annotation
- Batch Apex
  • 1. Database.Batchable interface
  • 2. Database.Stateful
  • 3. start(), execute(), and finish() methods
Topic 2: 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. When to use interfaces
  • 2. Interface definition and implementation
Topic 3: Apex Fundamentals10%- Apex Basics
  • 1. Apex operators and control flow statements
  • 2. Using SOQL to query Salesforce data
  • 3. Apex variables and data types
  • 4. DML operations (insert, update, delete, etc.)
- Apex Primitives
  • 1. Integer, Double, Long, String, Boolean types
  • 2. ID and sObject types
  • 3. Date, Datetime, Time classes
Topic 4: Apex Testing13%- Test Classes
  • 1. @isTest annotation
  • 2. Test data creation methods
  • 3. Test.startTest() and Test.stopTest()
- Testing Best Practices
  • 1. Assert statement usage
  • 2. Using seeAllData=false for isolated tests
  • 3. Coverage requirements (75% for deployment)
Topic 5: Apex Transaction Management10%- Governor Limits
  • 1. CPU time and heap size limits
  • 2. SOQL query limits
  • 3. DML statement limits
- Transaction Control
  • 1. Savepoint and rollback
  • 2. System.debug() usage
  • 3. Database methods with allOrNone parameter
Topic 6: Visualforce Pages8%- VF Page Basics
  • 1. Controllers and controller extensions
  • 2. Visualforce expressions
  • 3. component structure
- VF Standard Components
  • 1. Action methods and pageReference
  • 2. ,
  • 3. , ,
Topic 7: 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. Relationship queries (parent-child, child-parent)
  • 2. Query options (LIMIT, ORDER BY, WHERE)
  • 3. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
  • 4. Basic SOQL queries
Topic 8: Apex Triggers12%- Trigger Best Practices
  • 1. Handler class patterns
  • 2. One trigger per object pattern
  • 3. Recursive trigger prevention
- Trigger Syntax and Context Variables
  • 1. Trigger.newMap and Trigger.oldMap
  • 2. Trigger events (before insert, after insert, etc.)
  • 3. Trigger.old and Trigger.new context variables

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