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Salesforce DEX-450 exam study materials

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Salesforce DEX-450 exam covers a wide range of topics related to programmatic development using Apex and Visualforce in Lightning Experience. Some of the topics covered in the exam include Apex classes and triggers, Visualforce pages and components, Lightning Component Framework, and Salesforce Object Query Language (SOQL). DEX-450 Exam also covers topics such as debugging and testing Apex code, managing data with Apex, and managing the user interface with Visualforce.

Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q19-Q24):

NEW QUESTION # 19
If Apex code executes inside the =x=cuz=() method of an Apex class when implementing the Batchable interface, which two statements are true regarding governor limits?
Choose 2 answers

A. The Apex governor limits cannot be exceeded due to the asynchronous nature of the transaction.
B. The Apex governor limits will use the asynchronous limit levels.
C. The Apex governor limits are omitted while calling the constructor of the Apex class.
D. The Apex governor limits are reset for each iteration of the execute () method.

Answer: B,D

Explanation:
Option A: The Apex governor limits are reset for each iteration of the execute() method.
True.
In Batch Apex, each execution of the execute() method is a separate transaction.
Governor limits are reset at the start of each transaction.
Batch Apex operates asynchronously.
Asynchronous Apex has different (often higher) governor limits compared to synchronous Apex.
Even though asynchronous Apex has higher limits, governor limits can still be exceeded, leading to exceptions.
Governor limits apply to all Apex code, including constructors.
There are no exceptions for constructors.
Reference:
Batch Apex
Governor Limits
Option C: The Apex governor limits will use the asynchronous limit levels.
True.
Asynchronous Apex Limits
Option B: The Apex governor limits cannot be exceeded due to the asynchronous nature of the transaction.
False.
Governor Limit Exceptions
Option D: The Apex governor limits are omitted while calling the constructor of the Apex class.
False.
Governor Limits
Conclusion:
The correct statements are A and C.

NEW QUESTION # 20
Universal Hiring uses Salesforce to capture job applications. A salesforce administrator created two custom objects; Job__c acting as the master object, to Application_c acting as the detail.
Within the Job__c object, a custom multi-select picklist, preferred _Locations__c, contains a list of approved states for the position. Each Job_Application__c record relates to a Contact within the system through a master-detail relationship.
Recruiters have requested the ability to view whether the Contact's Mailing State value matches a value selected on the Preferred Locations__c field, within the Job_Application__c record. Recruiters would like this value to be kept in sync if changes occur to the Contact's Mailing State.
What is the recommended tool a developer should use to meet the business requirement?

A. Apex trigger
B. Roll-up summary field
C. Record-triggered flow

Answer: C

NEW QUESTION # 21
A developer created a new after insert trigger on the Lead object that creates Task records for each Lead.
After deploying to production, an existing outside integration that inserts Lead records in batches to Salesforce is occasionally reporting total batch failures being caused by the Task insert statement. This causes the integration process in the outside system to stop, requiring a manual restart.
Which change should the developer make to allow the integration to continue when some records in a batch cause failures due to the Task insert statement, so that manual restarts are not needed?

A. Use the Database method with allow one set to false.
B. Deactivate the trigger before the integration runs.
C. Use a try-catch block after the insert statement.
D. Remove the Apex class from the integration user's profile.

Answer: A

NEW QUESTION # 22
Consider the following code snippet for a Visualforce page that is launched using a Custom Button on the Account detail page layout.

When the Save button is pressed the developer must perform a complex validation that involves multiple objects and, upon success, redirect the user to another Visualforce page.
What can the developer use to meet this business requirement?

A. Controller
B. trigger
C. Apex
D. extension

Answer: B

NEW QUESTION # 23
Universal Containers decides to use exclusively declarative development to build out a new Salesforce application.
Which three options should be used to build out the database layer for the application?
Choose 3 answers

A. Custom objects and fields
B. Flows
C. Triggers
D. Relationships
E. Roll-up summaries

Answer: A,D,E

Explanation:
When building the database layer of a Salesforce application using exclusively declarative development, the following options are relevant:
Option A: Roll-up summaries
Valid Declarative Tool.
Roll-up summary fields allow calculations (SUM, COUNT, MIN, MAX) on child records in a master-detail relationship.
They are created declaratively.
Custom objects and fields form the core of the database schema.
They are created using the Setup menu without code.
Relationships (lookup, master-detail, and many-to-many via junction objects) are established declaratively.
They define how objects relate to each other.
Flows are used for process automation and logic.
They are part of the application logic layer, not the database layer.
Option E: Triggers
Requires Code (Not Declarative).
Triggers are written in Apex code.
They are not part of declarative development.
Conclusion:
To build the database layer declaratively, the developer should use Roll-up summaries (A), Custom objects and fields (C), and Relationships (D).
Reference:
Roll-Up Summary Fields
Option C: Custom objects and fields
Valid Declarative Tool.
Creating Custom Objects and Fields
Option D: Relationships
Valid Declarative Tool.
Object Relationships Overview
Incorrect Options:
Option B: Flows
Not Part of the Database Layer.

NEW QUESTION # 24
......

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