Free Salesforce DEX-450 Exam Questions

Become Salesforce Certified with updated DEX-450 exam questions and correct answers

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Total 387 Questions | Updated On: Oct 27, 2026

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Question 1

A developer must troubleshoot to pinpoint the causes of performance issues when a custom page loads in their org. Which tool should the developer use to troubleshoot?

A : AppExchange

B : Salesforce CLI

C : Visual Studio Core IDE

D : Developer Console

Answer: D

Question 2

A developer is writing tests for a class and needs to insert records to validate functionality.

Which annotation method should be used to create record for every method in the test class?

A : @isTest (SeeAllData-true)

B : @FreTest

C : @TestSetup

D : @StartTest

Answer: C

Question 3

A developer needs an Apex method that can process Account or Contact records. Which method signature should the developer use?

A : Public void doWork(Record theRecord)

B : Public void doWork(sObject theRecord)

C : Public void doWork(Account Contact)

D : Public void doWork(Account || Contatc)

Answer: B

Question 4

As a part of class implementation a developer must execute a SOQL query against a large data ser based on the contact object. The method implementation is as follows.

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Which two methods are best practice to implement heap size control for the above code? (Choose 2 Answers)

A : Use the FOR UPDATE option on the SOQL query to lock down the records retrieved.

B : Use visual keyword when declaring the retrieve variable.

C : Use a SOQL FOR loop, to chunk the result set in batches of 200 records.

D : Use WHERE clauses on the SOQL query to reduce the number of records retrieved.

Answer: B,C

Question 5

Given the following trigger implementation:

trigger leadTrigger on Lead (before update){

final ID BUSINESS_RECORDTYPEID = '012500000009Qad';

for(Lead thisLead : Trigger.new){

if(thisLead.Company != null && thisLead.RecordTypeId != BUSINESS_RECORDTYPEID){

thisLead.RecordTypeId = BUSINESS_RECORDTYPEID;

}

The developer receives deployment errors every time a deployment is attempted from Sandbox to Production.

What should the developer do to ensure a successful deployment?

A : Ensure BUSINESS_RECORDTYPEID is retrieved using Schema.Describe calls.

B : Ensure a record type with an ID of BUSINESS_RECORDTYPEID exists on Production prior to deployment.

C : Ensure BUSINESS_RECORDTYPEID is pushed as part of the deployment components.

D : Ensure the deployment is validated by a System Admin user on Production.

Answer: B

Page: 1 / 78

Total 387 Questions | Updated On: Oct 27, 2026

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