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Who should take the Salesforce DEX-450 Exam

This course is designed for programme developers starting on the Salesforce platform who require programming customizations on Apex and Visualforce business logic as well as on user interface layers. There are no prerequisites for Salesforce DEX-450 Exam.

• Programmatic developers.

Salesforce DEX-450 is an exam that focuses on programmatic development using Apex and Visualforce in the Lightning Experience. It is a certification that is designed for developers who want to demonstrate their skills and knowledge in building custom applications on the Salesforce platform. DEX-450 Exam Tests the developer's ability to create, debug, test and deploy Apex code, Visualforce pages, and Lightning components.

Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q31-Q36):

NEW QUESTION # 31
A developer created a trigger on the Account object. While testing the trigger, the developer sees the error message 'Maximum trigger depth exceeded'.
What could be the possible causes?

• A. The trigger does not have sufficient code coverage.
• B. The developer does not have the correct user permission.
• C. The trigger is getting executed multiple times.
• D. The trigger is too long and should be refactored into a helper class.

Answer: C

Explanation:
The error message 'Maximum trigger depth exceeded' occurs when a trigger invokes itself recursively more than the allowed limit.
Option C: The trigger is getting executed multiple times.
Correct Answer.
This error indicates that the trigger is recursively calling itself.
This can happen if the trigger performs an update or insert operation that causes the same trigger to fire again, leading to an infinite loop.
Salesforce enforces a limit on the recursion depth to prevent stack overflows.
User permissions do not cause the 'Maximum trigger depth exceeded' error.
Option B: The trigger is too long and should be refactored into a helper class.
*Incorrect, but possible code improvement.
While refactoring code into helper classes is a good practice, it does not directly address the recursion issue causing the error.
Option D: The trigger does not have sufficient code coverage.
Incorrect.
Code coverage issues affect deployment but do not cause runtime errors like 'Maximum trigger depth exceeded'.
Conclusion:
The error is caused because the trigger is getting executed multiple times due to recursion, leading to exceeding the maximum trigger depth.
Reference:
Triggers and Order of Execution
Preventing Recursive Triggers
Incorrect Options:
Option A: The developer does not have the correct user permission.
Incorrect.

 

NEW QUESTION # 32
A develop completed modification to a customized feature that is comprised of two elements:
Apex trigger
Trigger handler Apex class
What are two factors that the developer must take into account to properly deploy the modification to the production environment?

• A. Test methods must be declared with the testMethod keyword.
• B. At least one line of code must be executed for the Apex trigger.
• C. Apex classes must have at least 75% code coverage org-wide.
• D. All methods in the test classes must use @isTest.

Answer: B,C

 

NEW QUESTION # 33
The following code snippet is executed by a Lightning web component in an environment with more than 2,000 lead records:

Which governor limit will likely be exceeded within the Apex transaction?

• A. Total number of DML statement issued
• B. Total number of SOQL queries issued
• C. Total number of records retrieved by SOQL queries
• D. Total number of records processed as a result of DML statements

Answer: C

 

NEW QUESTION # 34
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 In stock.
Which relationship implementation supports these requirements on its own?

• A. Order has a re-parentable lookup field to Line Item,
• B. Order has a re-parentable master-detail field to Line Item.,
• C. Line Item has a re-parentable master-detail field to Order.
• D. Line Item has a re-parentable lookup field to Order.

Answer: C

Explanation:
To meet the given requirements, we need a relationship that allows:
Calculating the total amount on an Order.
This can be achieved using roll-up summary fields on the Order object to sum up values from its Line Item child records.
Roll-up summary fields are only available on the master object in a master-detail relationship.
Reference:
Calculating the line amount for each Line Item based on quantity selected and price.
This calculation can be handled using formula fields or triggers on the Line Item object.
Moving Line Items to a different Order if a Line Item is not in stock.
This requires the ability to reparent the Line Item to a different Order.
In a master-detail relationship, you can enable reparenting by selecting "Allow reparenting" in the relationship field settings.
Given these considerations, the appropriate relationship is:
Line Item has a re-parentable master-detail field to Order.
Option D satisfies all the requirements:
Master-detail relationship allows roll-up summary fields on Order.
Reparenting is enabled, allowing Line Items to be moved to a different Order.
Line Item calculations can be handled on the child object.
Incorrect Options:
Option A & C: Lookup relationships do not support roll-up summary fields.
Option B: If the Order has a master-detail field to Line Item, it contradicts the natural parent-child relationship.
Conclusion:
Option D is the correct choice as it supports roll-up summary fields, allows reparenting, and aligns with the parent-child relationship needed.

 

NEW QUESTION # 35
A developer created a Visualforce page and custom controller to display the account type field as shown below. Custom controller code: public class customCtrlr{ private Account theAccount; public String actType; public customCtrlr() { theAccount = [SELECT Id, Type FROM Account WHERE Id = :apexPages.currentPage().getParameters().get('id')]; actType = theAccount.Type; } } Visualforce page snippet: The Account Type is {!actType} The value of the account type field is not being displayed correctly on the page. Assuming the custom controller is property referenced on the Visualforce page, what should the developer do to correct the problem?

• A. Add a getter method for the actType attribute.
• B. Add with sharing to the custom controller.
• C. Convert theAccount.Type to a String.
• D. Change theAccount attribute to public.

Answer: A

Explanation:
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_controller_custom.htm

 

NEW QUESTION # 36
......

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