DEX-450 Self-Study Guide for Becoming an Programmatic Development using Apex and Visualforce in Lightning Experience Expert
DEX-450 Study Guide Realistic Verified DEX-450 Dumps
NEW QUESTION # 48
Get Cloudy Consulting (GCC) has a multitude of servers that host its customers' websites. GCC wants to provide a servers status page that is always on display in its call center. It should update in real time with any changes made to any servers. To accommodate this on the server side, a developer created a server Update platform event.
The developer is working on a Lightning web component to display the information.
- A. import ( subscribe, unsubscribe, onError ) from 'lightning/pubsub'
- B. import ( subscribe, unsubscribe, onError ) from 'lightning/empApi '
- C. import ( subscribe, unsubscribe, onError ) from 'lightning/ServerUpdate'
- D. import ( subscribe, unsubscribe, onError ) from 'lightning/MessageChannel'
Answer: B
NEW QUESTION # 49
An org has an existing flow that edits an Opportunity with an Update Records element. A developer must update the flow to also create a Contact and store the created Contact's ID on the Opportunity.
Which update must the developer make in the flow?
- A. Add a new Roll Back Records element.
- B. Add a new Update Records element.
- C. Add a new Create Records element.
- D. Add a new Get Records element.
Answer: C
Explanation:
To update the flow to create a Contact and store the Contact's ID on the Opportunity:
Option D: Add a new Create Records element.
Steps:
Add Create Records Element: Configure it to create a Contact and store the newly created Contact's ID in a variable.
Update Opportunity: Use the existing Update Records element or add a new one to update the Opportunity with the Contact's ID.
Reference:
"Use the Create Records element to create records in your flow."
- Salesforce Help: Create Records Element
Why Other Options Are Incorrect:
Option A: An Update Records element cannot create a new Contact.
Option B: A Get Records element retrieves existing records but does not create new ones.
Option C: Roll Back Records is used to undo record changes in the flow transaction.
NEW QUESTION # 50
A developer needs to prevent the creation of Request__c records when certain conditions exist in the system. A RequestLogic class exists that checks the conditions.
What is the correct implementation?
- A.
- B.
- C.
- D.
Answer: C
NEW QUESTION # 51
A develop created these three roll-up summary fields on the custom object. Project_c:
The developer is asked to create a new field that should the ratio between rejected and approved timesheet for a given project.
What are two benefits of choosing a formula held instead of an Apex trigger to fulfill the request? Choose 2 answers
- A. A formula field will trigger existing automation when deployed.
- B. A formula field will calculate the retroactively for existing records
- C. A test class will validate the formula field during deployment.
- D. Using a formula field reduces maintenance overhead.
Answer: A,B
NEW QUESTION # 52
Universal Container wants Opportunities to no longer be editable when itreaches the Closed/Won stage. Which two strategies can a developer use to accomplish this?
Choose2 answer
- A. Use an after-save flow.
- B. Use a validation
- C. Use a trigger
- D. Use the Process Automation settings.
Answer: B,C
NEW QUESTION # 53
A developer deployed a trigger to update the status__c of Assets related to an Account when the Account's status changes and a nightly integration that updates Accounts in bulk has started to fail with limit failures.
What should the developer change about the code to address the failure while still having the code update all of the Assets correctly?
- A. Add List<asset> assets = [SELECT id, Status_ FROM WHERE AccountId = : acctId] to line 14 and iterate over the assets list in the for loop on line 15.;
- B. Add a LIMIT clause to the SOQL query on line 16 to limit the number of Assets queried for an Account.
- C. Change the getAssetsToUpdate method to process all Accounts in one call and call it outside of the for loop that starts on line 03.
- D. Move all of the logic to a Queveable class that queries for and updates the Assets and call it from the trigger.
Answer: C
NEW QUESTION # 54
A company has a custom object, Sales, }_Help_Request__c, that has a Lookup relationship to Opportunity. The Seles Help Request__c has a mumber field, Number_ct_Hours__c, that represents the amount of time spent on the Sales_Help Request__C.
A developer is tasked with creating a field, total_Hour2__c, on Opportunity that should be the sum of all of the Number_of_Hours_c values for the Sales_Help_Request__c records related to that Opportunity.
What should the developer use to implement this?
- A. A roll-up summary field on the Opportunity object
- B. A trigger on the Opportunity object
- C. A record-triggered flow on the Sales Help Request__c object
- D. A roll-up summary field on the sales Help_Request__c object
Answer: C
NEW QUESTION # 55
A developer is asked to prevent anyone other than a user with Sales Manager profile from changing the Opportunity Status to Closed Lost if the lost reason is blank.
Which automation allows the developer to satisfy this requirement in the most efficient manner?
- A. approval process on the Opportunity object
- B. An Apex trigger on the Opportunity object
- C. An error condition formula on a validation rule on Opportunity
- D. A record trigger flow on the Opportunity object
Answer: C
NEW QUESTION # 56
A developer created a trigger on a custom object. This custom object also has some dependent pick lists.
According to the order of execution rules, which step happens first?
- A. System validation is run for maximum field lengths,
- B. Old values are overwritten with the new record values.
- C. JavaScript validation is run in the browser,
- D. The original record Is loaded from the database.
Answer: D
Explanation:
The first step in the Salesforce order of execution:
Option D: The original record is loaded from the database.
This is Step 1 in the order of execution.
Why Not Other Options:
Option A: Overwriting old values happens after loading the record.
Option B: JavaScript validation occurs on the client side before server processing.
Option C: System validation for field lengths happens after loading the record.
Reference:
Order of Execution:
"1. Loads the original record from the database or initializes the record for an upsert statement."
- Apex Developer Guide: Triggers and Order of Execution
NEW QUESTION # 57
A Next Best Action strategy uses an Enchance Element that invokes an Apex method to determine a discount level for a Contact, based on a number of factors. What is the correct definition of the Apex method?
- A. @InvocableMethod
global static ListRecommendation getLevel(List<ContactWrapper> input)
{ /*implementation*/ } - B. @InvocableMethod
global Recommendation getLevel (ContactWrapper input)
{ /*implementation*/ } - C. @InvocableMethod
global List<List<Recommendation>> getLevel(List<ContactWrapper> input)
{ /*implementation*/ } - D. @InvocableMethod
global static List<List<Recommendation>> getLevel(List<ContactWrapper> input)
{ /*implementation*/ }
Answer: D
NEW QUESTION # 58
What are two uses for External IDs? (Choose two.)
- A. To prevent an import from creating duplicate records using Upsert
- B. To create a record in a development environment with the same Salesforce ID as in another environment
- C. To create relationships between records imported from an external system.
- D. To identify the sObject type in Salesforce
Answer: A,C
NEW QUESTION # 59
The Account object in an organization has a master-detail relationship to a child object called Branch. The following automations exist:
* Roll-up summary fields
* Custom validation rules
* Duplicate rules
developer created a trigger on the Account object.
Which two things should the developer consider while testing the trigger code?
Choose 2 answers
- A. Rollup summary fields can cause the parent record to go through Save.
- B. The trigger may fire multiple times during a transaction.
- C. The validation rules will cause the trigger to fire again.
- D. Duplicate rules are executed once all DML operations commit to the database.
Answer: A,B
Explanation:
A . Roll-up summary fields can cause the parent record to go through Save:
When a roll-up summary field on a parent object (like Account) is updated due to changes in child records (like Branch), the parent record (Account) is implicitly saved again.
This can result in the execution of the trigger on the parent object. Developers must consider this behavior to avoid unintended recursion or infinite loops.
Reference:
C . The trigger may fire multiple times during a transaction:
Triggers can execute multiple times within a single transaction, especially when there are operations such as updates to the parent record caused by roll-up summary fields or workflows.
Developers should implement logic to ensure that the trigger handles multiple executions correctly (e.g., using a static variable to prevent recursion).
Why not the other options?
B . Duplicate rules are executed once all DML operations commit to the database:
This is incorrect because duplicate rules execute before the DML operation is committed. Duplicate rules prevent duplicate records from being created or updated before the database operation occurs.
D . The validation rules will cause the trigger to fire again:
This is incorrect because validation rules do not cause triggers to fire again. Validation rules validate the record and may prevent DML operations, but they do not independently re-trigger the Apex trigger.
Trigger Context and Recursion
Roll-Up Summary Field Documentation
NEW QUESTION # 60
Which three statements are accurate about debug logs?
Choose 3 answers
- A. Debug log levels are cumulative, where FINE log level includes all events logged at the DEBUG, INFO, WARN, and ERROR levels.
- B. Debug logs can be set for specific users, classes, and triggers.
- C. A System debug logs are retained for 24 hours.
- D. The maximum size of 3 debug log is 5 MB.
- E. Only the 20 most recent debug logs for a user are kept.
Answer: A,C,E
Explanation:
The accurate statements about debug logs are:
Option A: System debug logs are retained for 24 hours.
Reference:
"Debug logs are retained for 24 hours. After that, they're deleted."
- Salesforce Help: View Debug Logs
Option B: Only the 20 most recent debug logs for a user are kept.
"A maximum of 20 debug logs are retained for each user. If there are already 20 logs, the oldest log is overwritten."
- Salesforce Help: Log Limits
Option C: Debug log levels are cumulative, where FINE log level includes all events logged at the DEBUG, INFO, WARN, and ERROR levels.
"Each log level includes all events with higher severities. For example, the DEBUG level includes ERROR, WARN, and INFO events."
- Salesforce Developer Guide: Trace Flags
Why Other Options Are Incorrect:
Option D: While you can set debug logs for specific users, you cannot set them directly for specific classes and triggers. Instead, you use trace flags associated with users, Apex classes, or Apex triggers.
Option E: The maximum size of a debug log is 20 MB, not 5 MB.
"When the debug log exceeds the 20 MB maximum size, Salesforce truncates the log. Truncated logs end with a message similar to '... truncated'."
- Salesforce Help: Debug Log Limits
NEW QUESTION # 61
What are two benefits of the Lightning Component framework? (Choose two.)
- A. It simplifies complexity when building pages, but not applications.
- B. It provides an event-driven architecture for better decoupling between components.
- C. It allows faster PDF generation with Lightning components.
- D. It promotes faster development using out-of-box components that are suitable for desktop and mobile devices.
Answer: B,D
NEW QUESTION # 62
A developer created these three Rollup Summary fields in the custom object, Project__c:
The developer is asked to create a new field that shows the ratio between rejected and approved timesheets for a given project.
Which should the developer use to implement the business requirement in order to minimize maintenance overhead?
- A. Record-triggered flow
- B. Formula field
- C. Apex trigger
- D. Field Update actions
Answer: B
NEW QUESTION # 63
Which three options allow a developer to use custom styling in a Visualforce page? (Choose three.)
- A. <apex:stylesheet> tag
- B. Inline CSS
- C. <apex:style>tag
- D. <apex:stylesheets>tag
- E. A static resource
Answer: A,B,E
NEW QUESTION # 64
Given:
Map<ID, Account> accountMap = new Map>ID, Account> ([SELECT Id, Name FROM Account]); What are three valid Apex loop structures for iterating through items in the collection? (Choose three.)
- A. for (ID accountID : accountMap) {...}
- B. for (Integer i=0; I < accountMap.size(); i++) {...}
- C. for (ID accountID : accountMap.keySet()) {...}
- D. for (Account accountRecord : accountMap.values()) {...}
- E. for (Account accountRecord : accountMap.keySet()) {...}
Answer: B,C,D
NEW QUESTION # 65
A developer creates a custom exception as shown below:
What are two ways the developer can fire the exception in Apex? Choose 2 answers
- A. New ParityException( );
- B. Throw new parityException ( );
- C. New ParityException (parity does not match);
- D. Throw new ParityException (parity does not match);
Answer: B,D
NEW QUESTION # 66
Universal Containers has an order system that uses an Order Number to identify an order for customers and service agents. Order will be imported into Salesforce.
- A. Direct Lookup
- B. Lookup
- C. Indirect Lookup
- D. Number with External ID
Answer: D
NEW QUESTION # 67
While working in a sandbox, an Apex test fails when run in the Test Runner. However, executing the Apex logic in the Execute Anonymous window succeeds with no exceptions or errors. Why did the method fail in the sandbox test framework but succeed in the Developer Console?
- A. The test method is calling an @future method.
- B. The test method does not use Sysetem.runas= to execute as a specific user.
- C. The test method has a syntax error in the code.
- D. The test method relies on existing data in the sandbox.
Answer: D
Explanation:
The Apex test fails in the Test Runner but succeeds in the Execute Anonymous window because the test method relies on existing data in the sandbox.
Isolation of Test Data: By default, Apex tests do not have access to pre-existing data in the organization. Tests are executed in an isolated context to ensure they are not dependent on external data, promoting reliability and repeatability.
"Apex test methods don't have access to pre-existing data in the organization. The test methods have access to all data that they create and to changes made by other test methods (unless the @IsTest(Isolated=true) annotation is used)."
- Apex Developer Guide: Isolation of Test Data from Organization Data in Unit Tests Execute Anonymous Window: When code is run in the Execute Anonymous window, it executes in the current user's context and has access to all organization data, including existing records.
"All Apex code runs in system mode. The only exception is anonymous blocks, such as code executed using the Execute Anonymous window or the SOAP API."
- Apex Developer Guide: Enforcing Object and Field Permissions
Solution: To fix the failing test, the developer should create the necessary test data within the test method or use the @IsTest(SeeAllData=true) annotation if access to existing data is absolutely necessary (though this is generally discouraged).
"If you specify @IsTest(SeeAllData=true), the test method has access to all data in the organization, but the test can be slower and less reliable because it might depend on data that changes."
- Apex Developer Guide: Using the SeeAllData Annotation
Why Other Options Are Incorrect:
Option A: While calling an @future method requires special handling in tests, it would not cause the method to pass in Execute Anonymous and fail in tests.
Option C: A syntax error would prevent the code from compiling, so it wouldn't run in either context.
Option D: Using System.runAs is only necessary when testing code that behaves differently for users with different profiles or permissions.
Conclusion: The discrepancy arises because the test method is attempting to access data that isn't available in the test context, leading to its failure in the Test Runner but success in the Execute Anonymous window.
NEW QUESTION # 68
When a task is created for a contact, how can a developer prevent the task from being included on the activity timeline of the contact's account record?
- A. Use process builder to create a process to set the task account field to blank
- B. Create a task trigger to set the account field to NULL
- C. By default,tasks do not display on the account activity timeline
- D. In activity settings,uncheck roll-up activities to a contact's primary account
Answer: D
NEW QUESTION # 69
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. Line Item has a re-parentable master-detail field to Order.
- C. Line Item has a re-parentable lookup field to Order.
- D. Order has are-parentable master-detail field to Line Item.
Answer: B
NEW QUESTION # 70
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