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

  • Exam Code: DEX-450
  • Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
  • Updated: Aug 11, 2026
  • Q & A: 202 Questions and Answers

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

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Salesforce DEX-450 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Describe the memory lifecycle for static attributes
  • Use Platform Events for Immediate Error Logging
Topic 2
  • Describe practices for writing code that is easy to maintain and extend
  • Write triggers and classes that assume batches of data as input
Topic 3
  • Write a query that traverses a child-to-parent and parent-to-child relationship
  • Creating Roll-Up Summary Fields
Topic 4
  • Process the result of a query in Apex
  • Understanding Record Types
  • Use trigger context variables
Topic 5
  • Visualforce Development Considerations and Testing
  • Determine what data an Apex class can access
Topic 6
  • Describe strategies for Testing Visualforce controllers
  • Use SOQL to Query Parent-Child Relationships
Topic 7
  • Describe the syntax of a trigger definition
  • Display data from a record in a Visualforce page
Topic 8
  • Write a basic query using Salesforce’s query language, SOQL
  • Write Apex to invoke DML operations and handle DML errors
Topic 9
  • Write tests for action methods, getters, setters, and properties
  • List the differences between the ways you can invoke DML operations
Topic 10
  • Describe how triggers fit into and can be impacted by the Order of Execution
  • Building a Data Model on the Salesforce Platform

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

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

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

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Introduction to Salesforce DEX-450 Exam

This qualification concentrates on the programmer's validation of abilities, such as the programming of programs. Salesforce DEX-450 certification acknowledges that the applicant has the potential to conform his / her Salesforce applications to the heart of the Pinnacle programming language and the visual power diagram. The credential offers a better indicator of the competences which you have established to provide prospective employers. Professionals need to gain functional expertise in constructing and programming data objects (sObjectiles) to retrieve, modify and store data from these objects. Specify custom logic with Apex triggers and classes and use the built-in testing system to test this logic. This Guide covers all facets of the DEX-450 Test, the salary of the accredited specialist Salesforce DEX-450 and all the aspects of the Salesforce DEX-450 certification.

The Salesforce DEX-450 exam is a competency qualification test that acknowledges your capability growth. You need industry expertise to attempt the test. Professionals should execute the following duties following certification:

  • Write Visualforce and code for user interface setup
  • Using the combined Apex and Visual Powers evaluation system.
  • Write customizations of business logic using triggers and classes from Apex. SOQL and DML are used with these customizations.
  • Describe a range of the main features of multi-tenant programme architecture
  • Develop programmatic implementations that benefit from declarative personalizations
  • Describe how the trigger code functions in the Save Execution Order
  • Using a declarative GUI to build and change subjects

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Topics of Salesforce DEX-450 Exam

Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts. DEX-450 exam will include the following topics:

1. Objects and Fields

Describe the capabilities of objects on the Salesforce platform Create a custom object Create custom fields Create relationship fields

2. Work Effectively with Custom Objects and Fields

Create formula fields Create roll-up summary fields Describe the capabilities of record types

3. Programming with Apex

Describe key aspects of Apex that differentiate it from other languages, such as Java and C# Describe why Apex transactions and governor limits must be considered when writing Apex Execute simple Apex Use the sObject data type, the primitive data types, and basic control statements in Apex

4. Use SOQL to Query Your Org's Data

Write a basic query using Salesforce's query language, SOQL Process the result of a query in Apex Create a query dynamically at run-time Use SOQL to Query - Parent-Child Relationships Describe a relationship query Write a query that traverses a child-to-parent relationship Write a query that traverses a parent-to-child relationship

5. DML Essentials

List the differences between the ways you can invoke DML operations Write Apex to invoke DML operations and handle DML errors

6. Trigger Essentials

Describe what a trigger is used for Describe the syntax of a trigger definition Use trigger context variables

7. Apex Class Essentials

Describe how Apex classes are used Define an Apex class Determine what data an Apex class can access

8. The Save Order of Execution and Apex Transactions

Describe key points in the Order of Execution Describe how triggers fit into and can be impacted by the Order of Execution Describe the lifecycle of an Apex Transaction Describe the memory lifecycle for static variables

9. Testing Essentials

Describe Apex's testing framework Create test data Write and run an Apex test

10. Testing Strategies

Describe practices for writing code that is easy to maintain and extend Write triggers and classes that assume batches of data as input Write code that works efficiently with the database, both in querying and using DML

11. Strategies for Designing Efficient Apex Solutions

Determine your code coverage percentages Create tests using best practices

12. Trigger Design Strategies

List declarative mechanisms you can use to implement complex business logic, for what types of problems they are best used, and their limitations Describe ways in which you can use declarative functionality to improve your programmatic solutions

13. Creating Visualforce Pages

Create a Visualforce page Reference a standard controller Launch a Visualforce page using a custom button Display data from a record in a Visualforce page

14. Exploring the View and Controller Layers of Visualforce

Create a Visualforce page Display related data Invoke standard controller actions

15. Working with Custom Controllers and Controller Extensions

Create controller extensions Create a custom controller Work with properties Use PageReferences Invoke custom methods in Visualforce pages 14.Working with List Controllers and SOSL Queries

Use a standard list controller in a Visualforce page Create a SOSL query Create a custom list controller

16. Visualforce Development Considerations

Determine whether a declarative solution exists for your requirements Describe common governor limit issues and security concerns Describe Visualforce strategies Testing Visualforce Controllers Describe how a Visualforce controller interacts with the view Write tests for controller constructors Write tests for action methods, getters, setters, and properties

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