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

  • Exam Code: DEX-450
  • Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
  • Updated: Jul 27, 2026     Q & A: 202 Questions and Answers

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Average Salary for Salesforce DEX-450 Exam Certified Professional

Salesforce administrator roles are in great demand nowadays. The average salaries of Salesforce DEX-450 exam Certified professional in:

  • India - 16,42,330 INR
  • United State - 105,100 USD
  • Europe - 72,300 Euro
  • England - 70,400 POUND

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

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

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

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

How to Prepare for Salesforce DEX-450 Exam

Preparation Guide for Salesforce DEX-450 Exam

Introduction

Salesforce is a solution for managing customer relationships that unite customers and companies. This is an interactive CRM platform that provides a single, shared view of every client in all the divisions including marketing, distribution, exchange, and operation. Provide the clients with the individual experience Salesforce demand 360 product via the Integrated CRM Platform. It delivers solid and related goods to boost marketing, revenue, exchange, operation, IT, and more. Salesforce is a digital cloud computing (SaaS) firm specializing in the management of client relationships (CRMs). There was a mistake. The app is now the number one of consumer satisfaction and allows organizations to track customer behavior, advertise to consumers, and more. Salesforce is common because it is bundled with features such as contact management, workflow development, task management, incentive monitoring, teamwork tools, customer experience tools, analytics, and interactive, smartphone dashboard.

Salesforce DEX-450 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Apex Classes and Interfaces12%- Apex Interfaces
  • 1. When to use interfaces
  • 2. Interface definition and implementation
- Apex Classes
  • 1. Inheritance and virtual/abstract classes
  • 2. Class structure (attributes, methods, constructors)
  • 3. Access modifiers (public, private, protected, global)
Topic 2: Apex Testing13%- Test Classes
  • 1. Test.startTest() and Test.stopTest()
  • 2. @isTest annotation
  • 3. Test data creation methods
- Testing Best Practices
  • 1. Assert statement usage
  • 2. Coverage requirements (75% for deployment)
  • 3. Using seeAllData=false for isolated tests
Topic 3: Apex Triggers12%- Trigger Best Practices
  • 1. Recursive trigger prevention
  • 2. Handler class patterns
  • 3. One trigger per object pattern
- Trigger Syntax and Context Variables
  • 1. Trigger.old and Trigger.new context variables
  • 2. Trigger.newMap and Trigger.oldMap
  • 3. Trigger events (before insert, after insert, etc.)
Topic 4: Apex Fundamentals10%- Apex Primitives
  • 1. Date, Datetime, Time classes
  • 2. ID and sObject types
  • 3. Integer, Double, Long, String, Boolean types
- Apex Basics
  • 1. Apex variables and data types
  • 2. Using SOQL to query Salesforce data
  • 3. Apex operators and control flow statements
  • 4. DML operations (insert, update, delete, etc.)
Topic 5: 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. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
  • 3. Basic SOQL queries
  • 4. Query options (LIMIT, ORDER BY, WHERE)
Topic 6: 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. SOQL query limits
  • 3. DML statement limits
Topic 7: Visualforce Pages8%- VF Page Basics
  • 1. component structure
  • 2. Visualforce expressions
  • 3. Controllers and controller extensions
- VF Standard Components
  • 1. , ,
  • 2. ,
  • 3. Action methods and pageReference
Topic 8: 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

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