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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

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Updated: Aug 07, 2026

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What is the duration, language, and format of Salesforce DEX-450 Exam

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

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/

For more info read reference:

Salesforce DEX-450 Certification leaning site Salesforce DEX-450 Certification resources

Salesforce DEX-450 Exam Overview:

Certification Vendor:Salesforce
Exam Name:Programmatic Development using Apex and Visualforce in Lightning Experience
Exam Number:DEX-450
Passing Score:68%
Exam Format:Multiple Choice, Multiple Select
Real Exam Qty:60
Related Certifications:Platform Developer II (PDII)
Salesforce Certified Administrator
Exam Duration:120 minutes
Certificate Validity Period:2 years (for certification)
Available Languages:English
Exam Price:$200 USD
Sample Questions:Salesforce DEX-450 Sample Questions
Exam Way:In-person testing center or online proctored exam
Pre Condition:No formal prerequisites, but recommended: 1-2 years Apex development experience, completion of Salesforce Developer Beginner and Intermediate Trailhead modules
Official Syllabus URL:https://trailhead.salesforce.com/credentials/platform-developer-exam

Salesforce DEX-450 Exam Syllabus Topics:

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

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