DEX-450 Exam Study Guide Free Practice Test LAST UPDATED DATE Oct 27, 2022

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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

What is the duration, language, and format of Salesforce DEX-450 Exam

• The type of questions is Multiple Choice and situation-based questions.
• This exam consists of 85 questions
• There is a time limit of 120 minutes for the exam.

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

NO.120 Given the code below:

What should a developer do to correct the code so that there is no chance of hitting a governor limit?

 Rework the code and eliminate the for loop.

 combine the two SELECT statements into a single SOQL statement.

 Add a WHERE clause to the first SELECT SOQL statement.

 Add a LIMIT clause to the first SELECT SOQL statement.

NO.121 A visualforce interface is created for Case Management that includes both standard and custom functionality defined in an Apex class called myControllerExtension. The visualforce page should include which <apex:page> attribute(s) to correctly implement controller functionality?

 StandardController = “case” and extensions =” myControllerExtension”

 Extensions=” myControllerExtension”

 Controller=” myControllerExtension”

 Controller = “case” and extensions =” myControllerExtension”

NO.122 The operation manager at a construction company uses a custom object called Machinery to manage the usage and maintenance of its cranes and other machinery. The manager wants to be able to assign machinery to different constructions jobs, and track the dates and costs associated with each job. More than one piece of machinery can be assigned to one construction job.
What should a developer do to meet these requirements?

 Create a lookup field on the Construction Job object to the Machinery object.

 Create a lookup field on the Machinery object to the Construction Job object.

 Create a junction object with Master-Detail Relationship to both the Machinery object and the Construction Job object.

 Create a Master-Detail Lookup on the Machinery object to the Construction Job object.

NO.123 Which action may cause triggers to fire?

 Updates to Feed Items

 Renaming or replacing a picklist entry

 Changing a user’s default division when the transfer division option is checked

 Cascading delete operations

NO.124 When is an Apex Trigger required instead of a Process Builder Process?

 When a record needs to be created

 When multiple records related to the triggering record need to be updated

 When a post to Chatter needs to be created

 When an action needs to be taken on a delete or undelete, or before a DML operation is executed.

NO.125 The Review_c object have a lookup relationship to the job_Application_c object. The job_Application_c object has a master detail relationship up to the position_c object. The relationship is based on the auto populated defaults?
What is the recommended way to display field data from the related Review _C records a Visualforce page for a single Position_c record? Select one of the following:

 Utilize the Standard Controller for Position_c and cross-object Formula Fields on the Job_Application_c object to display Review_c data.

 Utilize the Standard Controller for Position_c and a Controller Extension to query for Review_c data.

 Utilize the Standard Controller for Position_c and expression syntax in the Page to display related Review_c through the Job_Applicacion_c inject.

 Utilize the Standard Controller for Position_c and cross-object Formula Fields on the Review_c object to display Review_c data.

NO.126 What are two valid options for iterating through each Account in the collection List<Account> named AccountList? (Choose two.)

 for (Account theAccount : AccountList) {…}

 for(AccountList) {…}

 for (List L : AccountList) {…}

 for (Integer i=0; i < AccountList.Size(); i++) {…}

NO.127 A developer creates a custom controller and a custom Visualforce page by using the code block below:
public class MyController {
public String myString {
get {
if (myString == null) { myString = ‘a’;
}
return myString;
} private set; } public string getMyString (){
return ‘getMyString’;
} public string getStringMethod () {
if (myString == null) {
myString = ‘b’;
} return myString;
}
} <apex:page controller = “MyController”> {!StringMethod}, {!myString}, {!myString} </apex:page> What can the user expect to see when accessing the custom page?

 A, a, a

 B, b, b

 A, b, getMyString

 B, a, getMyString

NO.128 When can a developer use a custom Visualforce page in a Force.com application? (Choose 2)

 To generate a PDF document with application data

 To create components for dashboards and layouts

 To deploy components between two organizations

 To modify the page layout settings for a custom object

NO.129 How can a developer warn users of SOQL governor limit violations in a trigger?

 Use ApexMessage.Message() to display an error message after the number of SOQL queries exceeds the limit.

 Use PageReference.setRedirect() to redirect the user to a custom Visualforce page before the number of SOQL queries exceeds the limit.

 Use Messaging.SendEmail() to continue the transaction and send an alert to the user after the number of SOQL queries exceeds the limit.

 Use Limits.getQueries() and display an error message before the number of SOQL queries exceeds the limit.

NO.130 A developer is tasked to perform a security review of the ContactSearch Apex class that exists in the system. Whithin the class, the developer identifies the following method as a security threat: List<Contact> performSearch(String lastName){ return Database.query(‘Select Id, FirstName, LastName FROM Contact WHERE LastName Like %’+lastName+’%); } What are two ways the developer can update the method to prevent a SOQL injection attack? Choose 2 answers

 Use variable binding and replace the dynamic query with a static SOQL.

 Use the escapeSingleQuote method to sanitize the parameter before its use.

 Use a regular expression on the parameter to remove special characters.

 Use the @Readonly annotation and the with sharing keyword on the class.

NO.131 In an organization that has enabled multiple currencies, a developer needs to aggregate the sum of the Estimated_value__c currency field from the CampaignMember object using a roll-up summary field called Total_estimated_value__c on Campaign.

 The values in Campaignmember.Estimated_value__c are converted into the currency of the Campaign record and the sum is displayed using the currency on the Campaign record.

 The values in CampaignMember.Estimated_value__c are converted into the currency on the majority of the CampaignMember records and the sum is displayed using that currency.

 The values in CampaignMember.Estimated_value__c are summed up and the resulting Total_estimated_value__c field is displayed as a numeric field on the Campaign record.

 The values In CampaignMember.Estimated_value__c are converted into the currency of the current user, and the sum is displayed using the currency on the Campaign record.

NO.132 From which two locations can a developer determine the overall code coverage for a sandbox? Choose two answers

 The Apex classes setup page

 The Test Suite Run panel the Developer Console

 The Test Tab of the Developer Console

 The Apex Test Execution page

NO.133 A Licensed_Professional__c custom object exist in the system with two Master-Detail fields for the following objects: Certification__c and Contact. Users with the “Certification Representative” role can access the Certification records they own and view the related Licensed Professionals records, however users with the “Salesforce representative” role report they cannot view any Licensed professional records even though they own the associated Contact record. What are two likely causes of users in the “Sales Representative” role not being able to access the Licensed Professional records? Choose 2 answers

 The organization’s sharing rules for Licensed_Professional__c have not finished their recalculation process.

 The organization recently modified the Sales representative role to restrict Read/Write access to Licensed_Professional__c

 The organization has a private sharing model for Certification__c, and Contact is the primary relationship in the Licensed_Professional__c object

 The organization has a private sharing model for Certification__c, and Certification__c is the primary relationship in the Licensed_Professional__c object.

NO.134 Which code in a Visualforce page and/or controller might present a security vulnerability?

 <apex:outputField value=”{!ctrl.userInput}” />

 <apex:outputText escape=”false” value=” {!$CurrentPage.parameters.userInput}” />

 <apex:outputText value=”{!£CurrentPage.parameters.userInput}” />

 <apex:outputField escape=”false” value=”{!ctrl.userInput}” />

NO.135 What are two testing consideration when deploying code from a sandbox to production? Choose 2 answers

 75% of test must execute without failure

 100% of test must execute without failure

 Apex code requires 75% coverage

 Apex code requires 100% coverage

NO.136 A developer Is asked to create a Visualforce page that lists the contacts owned by the current user. This component will be embedded In a Lightning page.
Without writing unnecessary code, which controller should be used for this purpose?

 Standard list controller

 Standard controller

 Lightning controller

 Custom controller

NO.137 Which three per-transaction limits have higher governor limits in asynchronous Apex transactions?

 Maximum CPU time

 Maximum heap size

 Total SOQL queries

 Maximum execution time

 Records returned by SOQL

NO.138 A developer has the following requirements:
Calculate the total amount on an Order.
Calculate the line amount for each Line Item based on quantity selected and price.
Move Line Items to a different Order if a Line Item is not stock.
Which relationship implementation supports these requirements?

 Line Items has a Master-Detail field to Order and the Master can be re-parented.

 Line Item has a Lookup field to Order and there can be many Line Items per Order

 Order has a Lookup field to Line Item and there can be many Line Items per Order.

 Order has a Master-Detail field to Line Item and there can be many Line Items per Order.

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