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NEW QUESTION # 31
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?
Answer: A
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 # 32
How can a developer get all of the available record types for the current user on the Case object?
Answer: B
Explanation:
Explanation
NEW QUESTION # 33
A developer wrote Apex code that calls out to an external system. How should a developer write the test to provide test coverage?
Answer: A
Explanation:
The developer should write a class that implements the HTTPCalloutMock interface to provide test coverage for the Apex code that calls out to an external system. The HTTPCalloutMock interface enables you to inject fake responses into the callout response in a test method, so that you can isolate your Apex logic from any dependency on the external system. The interface has one method, respond, that returns a predefined HTTPResponse object when the Apex code calls the HTTPRequest.send method. By using the HTTPCalloutMock interface, you can test your Apex code without actually calling the external system, which saves time and avoids hitting callout limits. The other options are not valid ways to mock a callout in a test method. The HTTPCalloutMock interface is not a class, so it cannot be extended. The WebserviceMock interface is used to mock a SOAP web service callout, not a RESTful HTTP callout. The WebserviceMock interface is also not a class, so it cannot be extended either. References:
* Apex Developer Guide: Testing HTTP Callouts by Implementing the HttpCalloutMock Interface, pages
1-2
* Trailhead: Platform Developer I Certification Study Guide: Apex Testing, unit 6
NEW QUESTION # 34
Which Apex class contains methods to return the amount of resources that have been used for a particular governor, such as the number of DML statements?
Answer: B
NEW QUESTION # 35
A developer is creating a page that allows users to create multiple Opportunities. The developer is asked to verify the current user's default } | Opportunity record type, and set certain default values based on the record type before inserting the record. i, J Calculator How can the developer find the current user's default record type? ns
Answer: C
Explanation:
user's default record type.
NEW QUESTION # 36
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