DEX-450 Examcollection Questions Answers & Exam DEX-450 PDF

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Salesforce DEX-450 exam is designed to test the knowledge and skills of developers who want to specialize in programmatic development using Apex and Visualforce in Lightning Experience. Programmatic Development using Apex and Visualforce in Lightning Experience certification is ideal for developers who have experience in developing custom applications on the Salesforce platform and want to take their skills to the next level. DEX-450 exam covers a wide range of topics, including Apex programming language, Visualforce framework, Lightning Components, and more.

To be eligible to take the DEX-450 Certification Exam, candidates must have a strong understanding of Apex programming language and Visualforce markup language. They should also be familiar with the Salesforce Lightning Experience user interface and have experience in developing custom applications on the platform. Candidates who pass the exam will have demonstrated their ability to develop and customize applications using Apex and Visualforce in the Lightning Experience.

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q189-Q194):

NEW QUESTION # 189
Which Apex collection is used to ensure that all values are unique?

A. An Enum
B. A List
C. A Set
D. An sObject

Answer: C

NEW QUESTION # 190
A developer is alerted to an issue with a custom Apex trigger that is causing records to be duplicated.
What is the most appropriate debugging approach to troubleshoot the issue?

A. Review the Historical Event logs to Identify the source of the issue.
B. Use the Apex Interactive Debugger to step through the code and Identify the issue.
C. Add system.debug statements to the code to track the execution flow and identify the issue.
D. Disable the trigger m production and test to see If the issue still occurs.

Answer: C

NEW QUESTION # 191
Which two number expression evaluate correctly? Choose 2 answers

A. Decimal D = 3.14159;
B. Integer I = 3.14159;
C. Double D =3.14159;
D. Long I = 3.14159;

Answer: A,C

NEW QUESTION # 192
Where can the custom roll-up summary fields be created using Standard Object relationships (Choose 3)

A. On Account using Opportunity records.
B. On Opportunity using Opportunity Product records.
C. On Campaign using Campaign Member records.
D. On Account using Case records.
E. On Quote using Order records.

Answer: A,B,C

NEW QUESTION # 193
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. Implement pagination with an OffsetController.
B. Use lazy loading and a transient List variable.
C. Use JavaScript remoting with SOQL Offset.
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 # 194
......

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DEX-450 Examcollection Questions Answers & Exam DEX-450 PDF

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q189-Q194):

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