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Salesforce Certified Platform Developer I Sample Questions (Q89-Q94):

NEW QUESTION # 89
Universal Containers has a Visualforce page that displays a table of every Container___c being rented by a given Account. Recently this page is failing with a view state limit because some of the customers rent over 10,000 containers.
What should a developer change about the Visualforce page to help with the page load errors?

A. Use JavaScript remoting with SOQL Offset.
B. Use lazy loading and a transient List variable.
C. Implement pagination with an OffsetController.
D. Implement pagination with a StandardSetController.

Answer: D

Explanation:
To address the view state limit error caused by loading over 10,000 records in a Visualforce page, the developer should implement pagination with a StandardSetController.
StandardSetController: This controller allows developers to easily paginate large sets of records in Visualforce pages.
"A StandardSetController object contains a reference to a list of records with pagination support, similar to the display in a list view."
- Apex Developer Guide: StandardSetController Class
Benefits:
Efficient Data Handling: It retrieves only a subset of records at a time, reducing the amount of data held in view state.
Built-in Pagination: Provides methods to navigate through pages of records (next, previous, etc.).
View State Limit: Visualforce pages have a view state limit of 170KB. Loading all records at once exceeds this limit.
"To optimize your Visualforce pages, minimize your use of view state. The view state of a Visualforce page is limited to 170KB."
- Visualforce Developer Guide: View State in Visualforce Pages
Why Not Other Options:
A . Implement pagination with an OffsetController: There's no standard OffsetController in Visualforce. Implementing custom pagination with offsets is less efficient and can be complex.
B . Use JavaScript remoting with SOQL Offset: While JavaScript remoting can reduce view state size, using SOQL OFFSET is not efficient for large offsets (over 2,000 records).
"When using OFFSET with a large number of records, performance degrades significantly."
- SOQL and SOSL Reference: OFFSET Clause
D . Use lazy loading and a transient List variable: Lazy loading can help, but it doesn't solve the issue of handling large datasets efficiently. Transient variables reduce view state but do not manage data retrieval or pagination.
Conclusion: Implementing pagination with a StandardSetController is the recommended solution to handle large datasets efficiently in Visualforce pages and prevent view state limit errors.

NEW QUESTION # 90
Which Lightning Web Component custom event property settings enable the event to bubble up the containment hierarchy and cross the Shadow DOM boundary?

A. bubbles: true, composed: true
B. bubbles: true, composed: false
C. bubbles: false, composed: false
D. bubbles: false, composed: true

Answer: A

Explanation:
Why These Settings?
bubbles: true: Enables the event to propagate up the containment hierarchy.
composed: true: Allows the event to cross the Shadow DOM boundary.
Why Not Other Options?
Other combinations (e.g.,bubbles: false) prevent the event from propagating or crossing the Shadow DOM boundary.
References:Custom Events in LWC:https://developer.salesforce.com/docs/component-library/documentation
/en/lwc/lwc.events_create_dispatch

NEW QUESTION # 91
Which three web technologies can be integrated into a Visualforce page? (Choose three.)

A. PHP
B. HTML
C. Java
D. JavaScript
E. CSS

Answer: B,C,E

NEW QUESTION # 92
A developer must perform a complex SOQL query that joins two objects in a Lightning component.
How can the Lightning component execute the query?

A. Create a flow to execute the query and invoke from the Lightning component.
B. Invoke an Apex class with the method annotated as @AuraEnabled to perform the query.
C. Use the Salesforce Streaming API to perform the SOQL query.
D. Write the query in a custom Lightning web component wrapper and invoke from the Lightning component.

Answer: B

Explanation:
When a Lightning component needs to execute a complex SOQL query that joins two objects, and such queries are not supported directly in Lightning components, the solution is to use an Apex controller method.
Option C: Invoke an Apex class with the method annotated as @AuraEnabled to perform the query.
Correct Approach.
The Lightning component can call an Apex method annotated with @AuraEnabled.
The Apex method can perform the complex SOQL query and return the results to the component.
While it's possible to invoke flows from Lightning components, flows are not ideal for executing complex SOQL queries.
Flows have limitations on data manipulation and querying.
Option B: Write the query in a custom Lightning web component wrapper and invoke from the Lightning component.
Not Applicable.
Lightning components (Aura or LWC) cannot execute complex SOQL queries directly.
They must call server-side Apex methods for such operations.
Option D: Use the Salesforce Streaming API to perform the SOQL query.
Incorrect.
The Streaming API is used for subscribing to data changes in real-time.
It is not used for executing queries.
Conclusion:
The Lightning component should invoke an Apex method annotated with @AuraEnabled to perform the complex SOQL query, which is Option C.
Reference:
Lightning Components and Apex
Using Apex to Get Data
Incorrect Options:
Option A: Create a flow to execute the query and invoke from the Lightning component.
Not Optimal.

NEW QUESTION # 93
A developer is asked to write helper methods that create test data for unit tests.

What should be changed in the Testvtils class so that its methods are only usable by unit test methods?

A. Remove static from line 03.
B. Add @IsTest above line 01.
C. Change public to private on line 01.
D. Add @IsTest above line 03,

Answer: D

NEW QUESTION # 94
......

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