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

DEX-450 real exams

Exam Code: DEX-450

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

Updated: Jul 21, 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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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.

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Salesforce DEX-450 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Working with Data - SOQL and SOSL15%- SOSL (Salesforce Object Search Language)
  • 1. SOSL syntax and use cases
  • 2. Returning sObjects from SOSL
- SOQL (Salesforce Object Query Language)
  • 1. Query options (LIMIT, ORDER BY, WHERE)
  • 2. Basic SOQL queries
  • 3. Relationship queries (parent-child, child-parent)
  • 4. Aggregate functions (COUNT, SUM, AVG, MIN, MAX)
Topic 2: Apex Fundamentals10%- Apex Primitives
  • 1. Integer, Double, Long, String, Boolean types
  • 2. ID and sObject types
  • 3. Date, Datetime, Time classes
- Apex Basics
  • 1. Apex variables and data types
  • 2. DML operations (insert, update, delete, etc.)
  • 3. Apex operators and control flow statements
  • 4. Using SOQL to query Salesforce data
Topic 3: Asynchronous Apex10%- Future Methods
  • 1. @future annotation
  • 2. AsyncRequestLimit exceeded handling
- Batch Apex
  • 1. Database.Batchable interface
  • 2. Database.Stateful
  • 3. start(), execute(), and finish() methods
Topic 4: Apex Testing13%- Testing Best Practices
  • 1. Using seeAllData=false for isolated tests
  • 2. Coverage requirements (75% for deployment)
  • 3. Assert statement usage
- Test Classes
  • 1. Test data creation methods
  • 2. Test.startTest() and Test.stopTest()
  • 3. @isTest annotation
Topic 5: Apex Triggers12%- 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.)
- Trigger Best Practices
  • 1. One trigger per object pattern
  • 2. Handler class patterns
  • 3. Recursive trigger prevention
Topic 6: Apex Classes and Interfaces12%- Apex Interfaces
  • 1. When to use interfaces
  • 2. Interface definition and implementation
- Apex Classes
  • 1. Class structure (attributes, methods, constructors)
  • 2. Inheritance and virtual/abstract classes
  • 3. Access modifiers (public, private, protected, global)
Topic 7: Visualforce Pages8%- VF Page Basics
  • 1. Visualforce expressions
  • 2. component structure
  • 3. Controllers and controller extensions
- VF Standard Components
  • 1. Action methods and pageReference
  • 2. ,
  • 3. , ,
Topic 8: Apex Transaction Management10%- Governor Limits
  • 1. CPU time and heap size limits
  • 2. DML statement limits
  • 3. SOQL query limits
- Transaction Control
  • 1. Savepoint and rollback
  • 2. System.debug() usage
  • 3. Database methods with allOrNone parameter
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