CRT-450 RELIABLE STUDY GUIDE & CRT-450 QUESTIONS ANSWERS

CRT-450 Reliable Study Guide & CRT-450 Questions Answers

CRT-450 Reliable Study Guide & CRT-450 Questions Answers

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Salesforce Certified Platform Developer I Sample Questions (Q44-Q49):

NEW QUESTION # 44
How many Accounts will be inserted by the following block of code?

  • A. 0
  • B. 1
  • C. 2
  • D. 3
  • E. 150

Answer: D

Explanation:
Additional Notes:
Governor Limits Enforcement:
Salesforce enforces governor limits to ensure efficient use of resources in a multi-tenant environment.
Exceeding limits results in a runtime exception (System.LimitException) that cannot be caught.
Exception Handling:
In this scenario, a System.LimitException is thrown, which cannot be handled by try-catch blocks.
Explanation:
Understanding the Code:
for (Integer i = 0 ; i < 500; i++) {
Account a = new Account (Name='New Account ' + i);
insert a;
}
What the Code Does:
Loops from i = 0 to i = 499 (total of 500 iterations).
In each iteration:
Creates a new Account record with the name 'New Account ' + i.
Performs an insert DML operation for each account.
Salesforce Governor Limits:
DML Statements Limit:
Maximum of 150 DML statements per Apex transaction.
Conclusion: Incorrect.
Option B: 0
Conclusion: Incorrect, as 150 accounts are inserted before hitting the limit.
Option C: 500
Conclusion: Incorrect, because the governor limit prevents more than 150 DML statements.
Option D: 150
Conclusion: Correct.
Optimizing the Code:
Bulk DML Operations:
Best Practice: Perform DML operations on lists rather than individual records to reduce the number of DML statements.
Optimized Code:
List<Account> accountList = new List<Account>();
for (Integer i = 0 ; i < 500; i++) {
Account a = new Account (Name='New Account ' + i);
accountList.add(a);
}
insert accountList;
Benefits:
Only one DML statement is used (insert accountList).
All 500 accounts are inserted successfully.
Reference:
Analyzing the Code Against Limits:
Number of DML Statements Used:
The code performs one DML statement per iteration.
Total DML statements attempted: 500.
Governor Limit Exceeded:
After 150 DML statements, the code exceeds the limit.
At the 151st insert, a LimitException is thrown.
Number of Accounts Successfully Inserted:
Only the first 150 accounts are inserted before the exception halts execution.
Option Analysis:
Option A: 100
Final answer:
Best Practices Summary:
Use Collections for DML Operations: Process records in bulk using lists or maps.
Avoid Loops with DML Statements: Do not place DML operations inside loops.


NEW QUESTION # 45
Which three statements are true regarding trace flags? (Choose three.)

  • A. Trace flags can be set in the Developer Console, Setup, or using the Tooling API.
  • B. If active trace flags are not set, Apex tests execute with default logging levels.
  • C. Setting trace flags automatically cause debug logs to be generated.
  • D. Logging levels override trace flags.
  • E. Trace flags override logging levels.

Answer: A,B,E


NEW QUESTION # 46
Universal Containers has a Visualforce page that displays a table of every Container_c. being ....... Is falling 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. Implement pagination with an OffsetController.
  • C. Use Lazy loading and a transient List variable.
  • D. Implement pagination with a StandardSetController,

Answer: D

Explanation:
The correct answer is D because it uses the StandardSetController class, which provides built-in pagination support for Visualforce pages. The StandardSetController can be initialized with a list of sObjects, a SOQL statement, or the ID of a filter. It also provides methods to navigate through the pages of data, such as first(), last(), next(), and previous(). By using the StandardSetController, the developer can avoid hitting the view state limit, which is 135 KB for Visualforce pages. The view state is the amount of data that is persisted between page requests. It includes the component tree, component attributes, and controller state. The StandardSetController reduces the view state size by storing only the current page of data in the view state, and not the entire data set.
The other options are incorrect because they do not provide an efficient or reliable way to implement pagination for Visualforce pages. Option A uses lazy loading and a transient list variable, which are not recommended for pagination. Lazy loading is a technique that defers loading data until it is needed, which can improve the initial page load time, but it can also cause performance issues if the data set is large or complex.
A transient list variable is a variable that is not stored in the view state, which can reduce the view state size, but it can also cause data loss or inconsistency if the page is refreshed or redirected. Option B uses JavaScript remoting with SOQL offset, which is not a good practice for pagination. JavaScript remoting is a technique that allows Visualforce pages to communicate with Apex controllers using asynchronous JavaScript calls.
SOQL offset is a clause that allows skipping a specified number of rows in a query result. However, JavaScript remoting has some limitations, such as the maximum size of the response payload (15 MB) and the maximum number of remoting calls per page (10). SOQL offset also has some limitations, such as the maximum offset value (2,000) and the performance impact of skipping many rows. Option C implements pagination with an OffsetController, which is a custom controller that uses the SOQL offset clause to paginate the data. This option has the same drawbacks as option B, as it relies on the SOQL offset clause, which is not a scalable or performant solution for pagination. References:
* Trailhead: Pagination with a StandardSetController
* Trailhead: Visualforce View State
* Salesforce Developer Guide: StandardSetController Class
* [Salesforce Developer Guide: JavaScript Remoting for Visualforce]
* [Salesforce Developer Guide: SOQL OFFSET Clause]


NEW QUESTION # 47
When importing and exporting data into Salesforce, which two statements are true?
Choose 2 answers

  • A. Bulk API can be used to import large data volumes in development environments without bypassing the storage limits.
  • B. Developer and Developer Pro sandboxes have different storage limits.
  • C. Bulk API can be used to bypass the storage limits when importing large data volumes in development environments.
  • D. Data import wizard is a client application provided by Salesforce.

Answer: A,B

Explanation:
* Bulk API is a RESTful API that allows you to load or delete large sets of data in Salesforce. It does not bypass the storage limits of your environment, but it can handle more records and run faster than other APIs12. Bulk API is useful for development, testing, and integration scenarios.
* Developer and Developer Pro sandboxes are two types of sandboxes that you can use to create and test applications in Salesforce. They have different storage limits and refresh intervals. Developer sandboxes have a 200 MB data storage limit and can be refreshed once per day. Developer Pro sandboxes have a 1 GB data storage limit and can be refreshed once every 5 days3 .
* Data import wizard is a web-based tool that you can use to import or update up to 50,000 records in Salesforce. It is not a client application, but a feature that is available in the Setup menu of Salesforce .
References:
* 1: Bulk API Developer Guide
* 2: Cert Prep: Platform Developer I: Data Modeling and Management
* 3: Sandbox Types and Templates
* : Cert Prep: Platform Developer I: Testing and Debugging
* : [What Is the Data Import Wizard?]
* : Cert Prep: Platform Developer I: Business Logic and Process Automation


NEW QUESTION # 48
Since Aura application events follow the traditional publish-subscribe model, which method is used to fire an event?

  • A. registerEvent()
  • B. fireEvent()
  • C. ernit()
  • D. fire()

Answer: D


NEW QUESTION # 49
......

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