Plat-Dev-301 Exam Introduction, Plat-Dev-301 New Question

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Salesforce Plat-Dev-301 Exam Syllabus Topics:

SectionObjectives
Integration and APIs- External system integration
  • 1. REST and SOAP API usage
    • 2. Callouts from Apex
      - Platform events and messaging
      • 1. Change Data Capture concepts
        • 2. Event-driven architecture
          Data Modeling and Management- Data access and security
          • 1. Sharing rules and Apex-managed sharing
            • 2. Security enforcement in Apex
              - Advanced data modeling
              • 1. Large data volume considerations
                • 2. Complex relationships and schema design
                  Application Development- Advanced Apex programming
                  • 1. Dynamic Apex and metadata-driven development
                    • 2. Apex design patterns and best practices
                      • 3. Exception handling and debugging strategies
                        - Asynchronous processing
                        • 1. Scheduled Apex
                          • 2. Batch Apex and Queueable Apex
                            • 3. Future methods and limits considerations
                              Testing and Deployment- Deployment lifecycle
                              • 1. Change sets and deployment tools
                                • 2. Version control and CI/CD concepts
                                  - Testing strategies
                                  • 1. Code coverage and quality practices
                                    • 2. Test data creation and mocking

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                                      Salesforce Certified Platform Developer II - Multiple Choice Sample Questions (Q102-Q107):

                                      NEW QUESTION # 102
                                      Refer to the test method below:

                                      The test method calls an @future method that increments the Number_of_Times_Viewed__c value. The assertion is failing because the Number of Times Viewed_c equals 0. What is the optimal way to fix this?

                                      Answer: D

                                      Explanation:
                                      When a test method calls an @future method that performs DML operations, the changes made by the @future method won't be visible until after the Test.stopTest() is called. This method ensures that all asynchronous processes are completed before the test execution continues. Therefore, Test.startTest() should be before the call to the @future method and Test.stopTest() immediately after.


                                      NEW QUESTION # 103
                                      A developer created an Apex class that updates an Account based on input from a Lightning web component that Is used to register an Account. The update to the Account should only be made if it has not already been registered.

                                      What should the developer do to ensure that users do not overwrite each other's updates to the same Account if they make updates at the same time? A)

                                      B)

                                      C)

                                      D)

                                      Answer: B

                                      Explanation:
                                      When multiple users are updating the same record at the same time, there is a risk of overwriting each other's changes. Salesforce provides a mechanism called 'record locking' to prevent this from happening.
                                      Option D is correct because including FOR UPDATE in the SOQL query locks the retrieved records for the duration of the transaction. This prevents other transactions from updating the record until the current transaction is complete, which is essential for avoiding race conditions where two users might overwrite each other's updates.
                                      Option A is incorrect because while adding a try/catch block around the update operation is good practice for handling exceptions, it does not prevent overwrites from concurrent updates.
                                      Option B is incorrect because using upsert instead of update does not address the problem of concurrent updates. The upsert operation is used to either insert a new record or update an existing one based on whether a record with a matching ID or external ID already exists.
                                      Option C is incorrect because FOR UPDATE should be used in the SOQL query to lock the records, not in the SELECT statement itself.
                                      Salesforce Developer Documentation on Locking Statements: Locking Statements Salesforce Developer Blog on Handling Concurrency in Apex: Handling Concurrency in Apex


                                      NEW QUESTION # 104
                                      What should be added to the setup, in the location indicated, for the unit test above to create the controller extension for the test?

                                      Answer: B

                                      Explanation:
                                      For the unit test to create the controller extension, the correct setup is to instantiate a new ApexPages.StandardController with the Account record and then use it to instantiate the AccountControllerExt. This sets up the controller extension with the context of the provided Account record.


                                      NEW QUESTION # 105
                                      Which three Visualforce components can be used to initiate Ajax behavior to perform partial page updates?
                                      Choose 3 answers

                                      Answer: A,B,C

                                      Explanation:
                                      <apex:commandLink> and <apex:commandButton> components can cause the form data to be sent to the server and can be configured to refresh specific parts of the page.
                                      <apex:actionSupport> adds AJAX support to other components and can trigger partial page updates based on events such as onclick, onchange, etc.
                                      Visualforce Guide


                                      NEW QUESTION # 106
                                      A developer is debugging an Apex-based order creation process that has a requirement to have three savepoints, SP1, SP2, and 5P3 {created in order), before the final execution of the process.
                                      During the final execution process, the developer has a routine to roll back to SP1 for a given condition. Once the condition is fixed, the code then calls 2 roll back to SP3 to continue with final execution. However, when the roll back to SP3 is called, a Funtime error occurs.
                                      Why does the developer receive a runtime error?

                                      Answer: A

                                      Explanation:
                                      Savepoints in Apex are markers within a transaction and rolling back to an earlier savepoint (SP1) invalidates any savepoints created after it. Thus, SP3 is invalidated when the code rolls back to SP1, causing a runtime error when a rollback to SP3 is attempted.


                                      NEW QUESTION # 107
                                      ......

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