最優秀的新版PDII題庫上線和資格考試的領導者和保證通過PDII：Platform Developer II考試

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Salesforce PDII Exam Syllabus Topics:

SectionObjectives
Asynchronous Apex- Batch Apex and Queueable Apex
  • 1. Chaining Queueable jobs
    • 2. Batch processing strategies and governor limits
      - Scheduled and future methods
      • 1. Use cases for @future methods
        • 2. Scheduling Apex jobs
          Integration and APIs- Salesforce integration patterns
          • 1. Callout patterns and limits
            • 2. REST and SOAP API usage
              - External system integration
              • 1. Named Credentials and authentication
                • 2. Platform Events and Change Data Capture
                  Advanced Apex Programming- Advanced Apex design patterns
                  • 1. Separation of concerns in Apex applications
                    • 2. Enterprise patterns (service, domain, selector layers)
                      - Complex Apex logic implementation
                      • 1. Advanced exception handling strategies
                        • 2. Dynamic Apex and reflection concepts
                          Testing, Debugging, and Deployment- Deployment and debugging
                          • 1. Debug logs and performance tuning
                            • 2. Change sets and CI/CD tools
                              - Test-driven development
                              • 1. Test data factory patterns
                                • 2. Writing advanced Apex test classes

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                                  最新的 Salesforce Developers PDII 免費考試真題 (Q70-Q75):

                                  問題 #70
                                  A developer must perform a complex SOQL query that joins two objects in a Lightning component. how can the Lightning component execute the query?

                                  答案：C


                                  問題 #71
                                  A developer is trying to access org data from within a test class.
                                  Which sObject type requires the test class to have the (seeAllData=true) annotation?

                                  答案：C

                                  解題說明：
                                  The seeAllData=true annotation is used to allow a test class to access all data in the org, instead of using test data that is created in the test class or by using test setup methods. This annotation should be used sparingly and only when absolutely necessary, as it can make the test class dependent on the data in the org and cause unexpected failures or unreliable results. The seeAllData=true annotation is required for some sObject types that do not support test data creation, such as Report, Dashboard, Document, and Attachment. Therefore, if the test class needs to access a Report sObject, it must use the seeAllData=true annotation. Reference: [Isolation of Test Data from Organization Data in Unit Tests], [Using the seeAllData Annotation]


                                  問題 #72
                                  A query using OR between a Date and a RecordType is performing poorly in a Large Data Volume environment. How can the developer optimize this?

                                  答案：D

                                  解題說明：
                                  Comprehensive and Detailed Explanation:
                                  In SOQL, using the OR operator often prevents the Query Optimizer from using indexes effectively, especially if the fields involve different types of data. This is known as a "non-selective" query structure in LDV environments.
                                  By breaking the query into two separate SOQL statements (Option A), the developer allows each query to be evaluated independently.
                                  * SELECT ... FROM Account WHERE CreatedDate = :thisDate (Uses the standard index on CreatedDate).
                                  * SELECT ... FROM Account WHERE RecordTypeId = :goldenRT (Uses the standard index on RecordTypeId).
                                  The developer can then combine the results into a Map<Id, Account> to ensure uniqueness (preventing duplicates if a record meets both criteria). This approach ensures both queries are "selective" and run much faster than a single query with an OR filter.
                                  Option D is a common anti-pattern because formulas are generally not indexed unless they are "deterministic" and a custom index is requested from Salesforce support; even then, filtering on formulas is often slower than direct field filters. Option B and C do not address the underlying database performance issue.


                                  問題 #73
                                  Which technique can run custom logic when a Lightning web component is loaded?

                                  答案：D


                                  問題 #74
                                  Given the following containment hierarchy:
                                  What is the correct way to communicate the new value of a property named ''passthrough'' to my-parent- component if the property is defined within my-child-component?

                                  答案：D

                                  解題說明：
                                  To communicate a property change up a containment hierarchy in Lightning Web Components (LWC), the child component should dispatch a custom event with the detail of the change. The parent component listens for this event and handles it accordingly.
                                  Option A is the correct method because it creates a new custom event with the detail property containing the new value of passthrough. This event is then dispatched, and the parent component can listen for this event to handle the updated value.
                                  Options B, C, and D are incorrect because they either don't pass any data with the event or they don't use the detail object which is the standard way to pass data with custom events in LWC.
                                  References:
                                  Lightning Web Components Developer Guide - Communicating with Events


                                  問題 #75
                                  ......

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