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

DEX-450 real exams

Exam Code: DEX-450

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

Updated: Aug 14, 2026

Q & A: 202 Questions and Answers

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