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Salesforce Plat-Dev-301 Exam Syllabus Topics:

Section	Objectives
Application Development	- Advanced Apex programming 1. Exception handling and debugging strategies 2. Apex design patterns and best practices 3. Dynamic Apex and metadata-driven development - Asynchronous processing 1. Batch Apex and Queueable Apex 2. Scheduled Apex 3. Future methods and limits considerations
Testing and Deployment	- Testing strategies 1. Test data creation and mocking 2. Code coverage and quality practices - Deployment lifecycle 1. Change sets and deployment tools 2. Version control and CI/CD concepts
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. Security enforcement in Apex 2. Sharing rules and Apex-managed sharing - Advanced data modeling 1. Complex relationships and schema design 2. Large data volume considerations

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Salesforce Certified Platform Developer II - Multiple Choice Sample Questions (Q118-Q123):

NEW QUESTION # 118
Which use case can be performed only by using asynchronous Apex?

A. Updating a record after the completion of an insert
B. Querying tens of thousands of records
C. Making a call to schedule a batch process to complete in the future
D. Calling a web service from an Apex trigger

Answer: D

Explanation:
Making a callout from an Apex trigger is not allowed synchronously; hence, such callouts must be performed in an asynchronous context. The only way to perform this within the Salesforce platform is by using asynchronous Apex, such as @future methods or Queueable Apex.

NEW QUESTION # 119
Universal Containers analyzes a Lightning web component and its Apex controller class that retrieves a list of contacts associated with an account. The code snippets are as follows:

Based on the code snippets, what change should be made to display the contacts' mailing addresses in the Lightning web component?

A. Add a new method in the Apex controller class to retneve the mailing addresses separately and modify the Lightning web component to invoke this method.
B. Modify the SOQL query in the getAccountContacts method to include the MailingAddress field and update the columns attribute in javascript file to add Mailing address fields.
C. Modify the SOQL guery in the getAccountContacts method to include the MailingAddress field.
D. Extend the lightning-datatable component in the Lightning web component to include a column for the MailingAddress field.

Answer: B

Explanation:
To display the contacts' mailing addresses in the Lightning web component, both the SOQL query in the getAccountContacts method and the columns attribute in the JavaScript file of the component need to be updated. The query must include the MailingAddress field, and the JavaScript file must be modified to add this field to the columns shown in the lightning-datatable.

NEW QUESTION # 120
A company recently deployed a Visualforce page with a custom controller that has a data grid of information about Opportunities in the org. Users report that they receive a "Maximum view state size limit" error message under certain conditions.
According to Visualforce best practice, which three actions should the developer take to reduce the view state?
Choose 3 answers

A. Use filters and pagination to reduce the amount of data.
B. Use the transient keyword in the Apex controller for variables that do not maintain state.
C. Use the private keyword in the controller for variables,
D. Refine any SOQL queries to return only data relevant to the page.
E. Use the final keyword in the controller for variables that will not change.

Answer: A,B,D

NEW QUESTION # 121
Refer to the code snippet below:

A custom object called Credit_Memo__c exists in a Salesforce environment. As part of a new feature development that retrieves and manipulates this type of record, the developer needs to ensure race conditions are prevented when a set of records are modified within an Apex transaction. In the preceding Apex code, how can the developer alter the query statement to use SOQL features to prevent race conditions within a transaction? A)

B)

C)

D)

A. Option A
B. Option C
C. Option B
D. Option D

Answer: A

Explanation:
To prevent race conditions during an Apex transaction, the SOQL query can be modified to include the "FOR UPDATE" keyword. This keyword locks the records that are returned by the query, preventing other transactions from modifying them until the current transaction is complete. This ensures that the retrieved records cannot be changed by another process before the current transaction is completed, thus preventing race conditions. The correct option to use in the code snippet provided is:
[SELECT Id, Name, Amount__c FROM Credit_Memo__c WHERE Customer_Id__c = :customerId LIMIT 50 FOR UPDATE] This will lock up to 50 records of Credit_Memo__c with the specified Customer_Id__c for the duration of the transaction.
FOR UPDATE
Preventing Record Update Conflicts

NEW QUESTION # 122
Users report that a button on a custom Lightning web component (LWC) is not saving the data they enter. The button looks to be clicked, but the LWC simply sits there, seemingly doing nothing.
What should the developer use to ensure error messages are properly displayed?

A. Add a try-catch block surrounding the DML statement.
B. Add JavaScript and HTML to display an error message.
C. Add the <apex:messages/> tag to the component.
D. Use the Database method with a110rNone Set to false.

Answer: B

Explanation:
To ensure error messages are properly displayed in a Lightning web component, the developer should use JavaScript to handle errors in the component's client-side code and use HTML to display the message on the UI. This can be combined with Apex exception handling for server-side operations.

NEW QUESTION # 123
......

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