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Salesforce Plat-Dev-301 Exam Syllabus Topics:

SectionWeightObjectives
Logic, Process Automation, and Integration27%- Complex business logic and automation design
- Asynchronous Apex: future, queueable, batch, scheduled
- Advanced Apex programming and transaction management
- REST/SOAP API, Platform Events, and external integrations
Testing, Debugging, and Deployment20%- Deployment strategies, CI/CD, and change management
- Advanced testing strategies and test frameworks
- Debugging and error handling across layers
Performance and Data Management18%- Optimize queries and handle large data volumes
- Governor limits optimization and best practices
- Data modeling and complex data operations
Advanced Developer Fundamentals15%- Work with localization, multi-currency, and global features
- Design and maintain scalable, reusable code
- Apply security best practices in development
User Interface Development20%- Optimize UI performance and usability
- Implement advanced Visualforce functionality
- Build complex Lightning Web Components and Aura Components

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Salesforce Certified Platform Developer II - Multiple Choice 認定 Plat-Dev-301 試験問題 (Q131-Q136):

質問 # 131
Which three approaches should a developer implement to obtain the best performance for data retrieval when building a Lightning web component? Choose 3 answers

正解：A、B、C

解説：
Lazy loading improves performance by loading data only when needed.
Lightning Data Service (LDS) handles data operations and caching efficiently.
Using {Cacheable=true} on Apex methods enables the Lightning Component framework to cache the method's return value, reducing server round-trips for the same data.
Lightning Web Components Developer Guide


質問 # 132
A developer is creating a Lightning web component that displays a list of records in a lightning-datatable. After saving a new record to the database, the list is not updating.

What should the developer change in the code above for this to happen?

正解：C

解説：
In Lightning Web Components (LWC), the data displayed in a component is not automatically refreshed when a new record is saved to the database. To refresh the displayed list of records in a lightning-datatable after a save operation, developers should use the refreshApex() function. This function is imported from the @salesforce/apex module and is used to refresh the cache and re-execute the Apex wire method to fetch the latest data from the server. The @track decorator is no longer necessary in most cases due to reactive properties being the default behavior in LWC as of Spring '20 release. Also, calling refreshApex() on this.data directly or creating a new tracked variable will not initiate a refresh of the cached data.
ferences:
Get Updated Data with refreshApex()
Lightning Web Components and Salesforce Data


質問 # 133
A business requires that every parent record must have a child record. A developer writes an Apex method with two DML statements to insert a parent record and a child record.
A validation rule blocks child records from being created. The method uses a try/catch block to handle the DML exception.
What should the developer do to ensure the parent always has a child record?

正解：C

解説：
By setting a savepoint before the DML operations and rolling back to that savepoint in the event of an exception, the developer can ensure that the parent record is not committed without a corresponding child record.
Apex Developer Guide


質問 # 134
Which interface needs to be implemented by an Aura component so that it may be displayed in modal dialog by clicking a button on a Lightning record page?

正解：D

解説：
To display an Aura component in a modal dialog, the component must implement the force:lightningQuickAction or force:lightningQuickActionWithoutHeader interface. This allows it to be used as a quick action on record pages.


質問 # 135
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?

正解：A

解説：
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.


質問 # 136
......

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