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How to Prepare for Salesforce DEX-450 Exam

Preparation Guide for Salesforce DEX-450 Exam

Introduction

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

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