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
For more info read reference:
Salesforce DEX-450 Certification leaning site
Salesforce DEX-450 Certification resources
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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:
| Section | Weight | Objectives |
| Working with Data - SOQL and SOSL | 15% | - 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)
- SOSL (Salesforce Object Search Language)
- 1. Returning sObjects from SOSL
- 2. SOSL syntax and use cases
|
| Apex Fundamentals | 10% | - Apex Basics
- 1. Apex operators and control flow statements
- 2. Using SOQL to query Salesforce data
- 3. Apex variables and data types
- 4. DML operations (insert, update, delete, etc.)
- Apex Primitives
- 1. ID and sObject types
- 2. Integer, Double, Long, String, Boolean types
- 3. Date, Datetime, Time classes
|
| Visualforce Pages | 8% | - VF Standard Components
- 1. ,
- 2. Action methods and pageReference
- 3. , ,
- VF Page Basics
- 1. component structure
- 2. Controllers and controller extensions
- 3. Visualforce expressions
|
| Asynchronous Apex | 10% | - Future Methods
- 1. @future annotation
- 2. AsyncRequestLimit exceeded handling
- Batch Apex
- 1. Database.Batchable interface
- 2. start(), execute(), and finish() methods
- 3. Database.Stateful
|
| Apex Transaction Management | 10% | - Governor Limits
- 1. SOQL query limits
- 2. CPU time and heap size limits
- 3. DML statement limits
- Transaction Control
- 1. Savepoint and rollback
- 2. System.debug() usage
- 3. Database methods with allOrNone parameter
|
| Apex Testing | 13% | - Test Classes
- 1. Test data creation methods
- 2. @isTest annotation
- 3. Test.startTest() and Test.stopTest()
- Testing Best Practices
- 1. Using seeAllData=false for isolated tests
- 2. Coverage requirements (75% for deployment)
- 3. Assert statement usage
|
| Apex Triggers | 12% | - Trigger Syntax and Context Variables
- 1. Trigger.old and Trigger.new context variables
- 2. Trigger events (before insert, after insert, etc.)
- 3. Trigger.newMap and Trigger.oldMap
- Trigger Best Practices
- 1. One trigger per object pattern
- 2. Recursive trigger prevention
- 3. Handler class patterns
|
| Apex Classes and Interfaces | 12% | - 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)
|