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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

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