最實用的CRT-450認證考試資料現在世界上有很多 IT人才，IT行業競爭激烈。所以很多IT人才會選擇參加相關的IT認證考試來提高自己在IT行業中的地位。CRT-450 考試就是Salesforce的一個很重要的認證考試，但是很多IT專業人員要想拿到Salesforce 認證證書，他們就必須得通過考試。 最新的 Salesforce Developers CRT-450 免費考試真題 (Q229-Q234):問題 #229
When the code executes, a DML exception is thrown.
How should a developer modify the code to ensure exceptions are handled gracefully?
A. Remove null items from the list of Accounts.
B. Implement the upset DML statement.
C. Implement a try/catch block for the DML.
D. Implement Change Data Capture.
答案：C
解題說明：
Why a try/catch block is required:
In Salesforce, DML operations such as insert, update, delete, and upsert can throw exceptions due to issues like validation rule violations, field constraints, or sharing rule restrictions.
Using a try/catch block ensures that these exceptions are caught and handled gracefully, preventing the entire transaction from failing.
How to modify the code:
The update statement in the code can be wrapped in a try/catch block to catch and handle any exceptions that occur. For example:
apex
Copy code
public static void insertAccounts(List<Account> theseAccounts) {
try {
for (Account thisAccount : theseAccounts) {
if (thisAccount.website == null) {
thisAccount.website = 'https://www.demo.com';
}
}
update theseAccounts;
} catch (DmlException e) {
System.debug('DML Exception: ' + e.getMessage());
}
}
Why not the other options?
A . Implement the upsert DML statement:
upsert is used to either insert or update records based on an external ID or primary key. It does not inherently handle exceptions.
B . Implement Change Data Capture:
Change Data Capture (CDC) is used for tracking changes to data in real time and is unrelated to handling DML exceptions.
D . Remove null items from the list of Accounts:
While cleaning the input data is a good practice, it does not address the need for exception handling during DML operations.
Reference:
Apex Error Handling
DML Operations in Apex
問題 #230
When importing and exporting data into Salesforce, which two statements are true? Choose 2 answers
A. Data import wizard is a client application provided by Salesforce.
B. Bulk API can be used to bypass the storage limits when importing large data volumes in development environments.
C. Developer and Developer Pro sandboxes have different storage limits.
D. Bulk API can be used to import large data volumes in development environments without bypassing the storage limits.
答案：A,C
問題 #231
What should a developer use to script the deployment and unit test execution as part of continuous integration?
A. Salesforce CLI
B. Execute Anonymous
C. VS Code
D. Developer Console
答案：A
解題說明：
A developer should use the Salesforce CLI to script the deployment and unit test execution as part of continuous integration. The Salesforce CLI is a powerful command line interface that simplifies development and build automation when working with your Salesforce org. You can use the Salesforce CLI to perform various tasks such as creating and deploying metadata, running Apex tests, retrieving debug logs, and managing orgs1. References:
* Salesforce CLI
* Certification - Platform Developer I - Trailhead
* SALESFORCE CERTIFIED PLATFORM DEVELOPER I
問題 #232
Which statement about change set deployments is accurate? (Choose 3)
A. They can be used only between related organizations.
B. They require a deployment connection.
C. They can be used to deploy custom settings data.
D. They ca be used to transfer Contact records.
E. They use an all or none deployment model.
答案：A,B,E
問題 #233
While working in a sandbox, an Apex test fails when run in the Test Runner. However, executing the Apex logic in the Execute Anonymous window succeeds with no exceptions or errors.
Why did the method fail in the sandbox test framework but succeed in the Developer Console?
A. The test method does not use System. rurAs to execute as a specific user.
B. The test method relies on existing data in the sandbox.
C. The test method has a syntax error In the code.
D. The test method Is calling an future method.
答案：B
解題說明：
The test method fails in the sandbox test framework because it relies on existing data in the sandbox, which may not be consistent or available for the test execution. The Apex test framework uses a separate test data context that is rolled back after the test execution, so any data that is queried or inserted by the test method must be created within the test method or by using the @testSetup annotation. The Execute Anonymous window, on the other hand, runs the Apex logic in the current user context and can access the existing data in the sandbox. Therefore, the Apex logic may succeed in the Execute Anonymous window but fail in the test framework. References:
* Apex Testing (Salesforce Developer Documentation)
* Isolation of Test Data from Organization Data in Unit Tests (Salesforce Developer Documentation)
* Free Salesforce Platform Developer 1 Practice Exam (With Answers) (Salesforce Ben)