Echte Plat-Dev-301 Fragen und Antworten der Plat-Dev-301 Zertifizierungsprüfung

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Salesforce Plat-Dev-301 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Data Modeling	12%	- Large data volumes considerations - External objects and data sources - Advanced object relationships and data modeling
Topic 2: Integration	15%	- Named Credentials and authentication - Platform Events and Change Data Capture - REST and SOAP web services (Apex callouts) - External Services and Connect REST API
Topic 3: User Interface	18%	- Lightning Web Components (LWC) advanced features - Aura Components - Lightning Data Service - Visualforce advanced controllers
Topic 4: Logic and Process Automation	22%	- Advanced Apex programming - Asynchronous Apex (Batch, Queueable, Future, Scheduled) - Dynamic Apex and SOQL/SOSL - Invocable Actions and Platform Events
Topic 5: Testing, Debugging, and Deployment	15%	- Debugging and performance profiling - Deployment tools (SFDX, Metadata API) - Test data strategies and mocking - Apex unit testing best practices
Topic 6: Architecture	18%	- Design patterns and Apex trigger frameworks - Governor limits and bulkification - Namespace and package management - Apex Enterprise Patterns

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Salesforce Certified Platform Developer II - Multiple Choice Plat-Dev-301 Prüfungsfragen mit Lösungen (Q125-Q130):

125. Frage
A company has code to update a Request and Request Lines and make a callout to their external ERP system's REST endpoint with the updated records.

The callousUtil.makeRestCallout fails with a "You have uncommitted work pending. Please commit or rollback before calling cut' error. What should be done to address the problem?

A. Remove the Database. setSavepoint and Database. rollback.
B. Change the callousUtil makeRestCallout to an @InvocsblsMethod method.
C. Change the CallousUtill .makeRestCallout to an @future method.

Antwort: C

Begründung:
The error occurs because DML operations were performed before a callout. To fix this, the callout should be made from an asynchronous method such as one annotated with @future(callout=true), which allows DML operations to be committed separately from the callout.
nces: Apex Developer Guide - Making Asynchronous Callouts

126. Frage
How can a developer efficiently incorporate multiple JavaScript libraries in an Aura component?

A. Use JavaScript remoting and script tags.
B. Use CDNs with script attributes.
C. Implement the libraries in separate helper files.
D. Join multiple assets from a static resource.

Antwort: D

Begründung:
For incorporating multiple JavaScript libraries in Aura components, the best practice is to join multiple assets into a single static resource. This approach is efficient and avoids issues with asynchronous loading and potential conflicts between libraries. Aura Components Developer Guide - Using External JavaScript Libraries

127. Frage
A Visuzlforce page loads slowly due to the large amount of data it displays.
Which strategy can a developer use to improve the performance?

A. Use lazy loading to load the data on demand, instead of in the controller's constructor.
B. Use Javascript to move data processing to the browser instead of the controller.
C. Use an <apex:actionPollar) in the page to load all of the data asynchronously.
D. Use the transient keyword for the List variables used in the custom controller.

Antwort: A

Begründung:
Lazy loading is a strategy to improve the performance of a Visualforce page that loads a large amount of data. By loading the data on demand, rather than in the controller's constructor, the initial page load is faster, and additional data is only loaded when necessary.

128. Frage
Just prior to a new deployment the Salesforce administrator, who configured a new order fulfillment process feature in a developer sandbox, suddenly left the company.
Ag part of the UAT cycle, the users had fully tested all of the changes in the sandbox and signed off on them; making the Order fulfillment feature ready for its go-live in the production environment.
Unfortunately, although a Change Set was started, it was not completed by the former administrator.
A developer is brought in to finish the deployment.
What should the developer do to identify the configuration changes that need to be moved into production?

A. Use the Metadata API and a supported development IDE to push all of the configuration from the sandbox into production to ensure no changes are lost.
B. Set up Continuous Integration and a Git repository to automatically merge all changes from the sandbox metadata with the production metadata.
C. Leverage the Setup Audit Trail to review the changes made by the departed Administrator and identify which changes should be added to the Change Set.
D. In Salesforce setup, look at the last modified date for every object to determine which should be added to the Change Set.

Antwort: C

Begründung:
To identify the configuration changes made by the former administrator, the developer should leverage the Setup Audit Trail. This allows tracking changes made in the Setup area of Salesforce, showing the date of the change, who made it, and what the change was.

129. Frage
A developer is creating a page in App Builder that will be used in the Salesforce mobile app.
Which two practices should the developer follow to ensure the page operates with optimal performance?
Choose 2 answers

A. Limit 25 fields on the record detail page.
B. Limit five visible components on the page.
C. Analyze the page with Performance Analysis for App Builder.
D. Limit the number of Tabs and Accordion components.

Antwort: C,D

Begründung:
For mobile app pages in App Builder, best practices include limiting the number of heavy components like Tabs and Accordion because they can negatively impact performance due to increased client-side processing and data transfer. Also, using Performance Analysis in App Builder helps in identifying components that may slow down page performance and provides recommendations for improvements. Reference:
Optimize Performance in the Salesforce Mobile App
Lightning App Builder Performance Analysis

130. Frage
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