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[General] Salesforce Plat-Dev-301 High Quality, Plat-Dev-301 Reliable Test Tutorial

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【General】 Salesforce Plat-Dev-301 High Quality, Plat-Dev-301 Reliable Test Tutorial

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Salesforce Certified Platform Developer II - Multiple Choice Sample Questions (Q69-Q74):NEW QUESTION # 69
A developer is working on an integration between Salestorce and an external system. The integration requires sending a large amount of data to the external systern, which can cause long response times and timeouts.
To optimize the performance and avoid timeouts, which technique should be used?
  • A. Use the @future annotation to make the callout asynchronous.
  • B. Increase the timeout limit in the callout options,
  • C. Implement an asynchronous callout using the Continuation class,
  • D. Use a chained batch Apex to split the data into smaller batches.
Answer: C
Explanation:
Implementing an asynchronous callout using the Continuation class is the optimal solution to handle long response times and avoid timeouts in Salesforce. It allows the Apex code to make a long-running request to an external service and free up the thread to serve other requests.

NEW QUESTION # 70
Which two best practices should the developer implement to optimize this code? Choose 2 answers
  • A. Use a collection for the DML statement.
  • B. Query the Driving-Structure_C records outside of the loop
  • C. Remove the DML statement.
  • D. Change the trigger context to after update, after insert
Answer: A,B
Explanation:
To optimize the code in question, it's important to follow best practices that reduce the number of SOQL queries and DML statements within loops, as these can quickly consume governor limits and lead to inefficiencies. Option C is correct because using a collection to hold records and performing a single DML operation outside of loops reduces the number of DML operations, which is a best practice for bulkifying code in Salesforce. Option D is also correct because querying records outside of a loop prevents hitting SOQL governor limits and makes the code more efficient. Options A and B are not correct in the context provided, as there isn't enough information to determine if changing the trigger context is necessary, and removing the DML statement altogether may not be feasible if the logic requires data to be persisted.
Reference
Apex Best Practices: Apex Developer Guide Best Practices

NEW QUESTION # 71
An environment has two Apex triggers: an after-update trigger on Account and an after-update trigger on Contact.
The Account after-update trigger fires whenever an Account's address is updated, and it updates every associated Contact with that address. The Contact after-update trigger fires on every edit, and it updates every Campaign Member record related to the Contact with the Contact's state.
Consider the following: A mass update of 200 Account records' addresses, where each Account has 50 Contacts. Each Contact has one Campaign Member. This means there are 10,000 Contact records across the Accounts and 10,000 Campaign Member records across the contacts.
What will happen when the mass update occurs?
  • A. There will be no error and all updates will succeed, since the limit on the number of records processed by DML statements was not exceeded.
  • B. There will be no error, since each trigger fires within its own context and each trigger does not exceed the limit of the number of records processed by DML statements.
  • C. The mass update will fail, since the two triggers fire in the same context, thus exceeding the number of records processed by DML statements.
  • D. The mass update of Account address will succeed, but the Contact address updates will fail due to exceeding number of records processed by DML statements.
Answer: C
Explanation:
In this scenario, the governor limit for DML statements (150 DML operations and 10,000 DML rows per transaction) will be exceeded because the updates will cascade across related objects, significantly multiplying the number of records processed.
Apex Developer Guide

NEW QUESTION # 72
Consider the queries in the options below and the following Information:
* For these queries, assume that there are more than 200,000 Account records.
* These records Include soft-deleted records; that is, deleted records that are still in the Recycle Bin.
* There are two fields that are marked as External Id on the
Account. These fields are customer_Number_c and ERR_Key_ s.
Which two queries are optimized for large data volumes?
Choose 2 answers
  • A. SELECT Id FROM Account WHERE Name !- NULL
  • B. SELECT Id FROM Account WHERE Name != ' 'AND IsDeleted = false
  • C. SELECT 1d FROM Accounts WHERE Name != 'AND Customer_Number_c- "ValueA'
  • D. SELECT ID FROM Account WHRE id IN :aListVariable
Answer: B,C
Explanation:
For optimizing queries, especially on large data volumes, it's recommended to use indexed fields such as External ID fields, which will make the queries selective. Among the options given:
B) is optimized because it is using the Customer_Number__c field, which is an External ID and hence indexed.
D) is also optimized because it filters out deleted records with IsDeleted = false and uses Name != ' ', which is likely to be selective.
Using indexed fields and filtering out unnecessary records helps in faster query execution on large data volumes.
Make SOQL Query Selective
Working with Very Large SOQL Queries

NEW QUESTION # 73
A developer built an Aura component for guests to self-register upon arrival at a front desk kiosk. Now the developer needs to create a component for the utility tray to alert users whenever a guest arrives at the front desk.
What should be used?
  • A. DML Operation
  • B. Changelog
  • C. Application Event
  • D. Component Event
Answer: C
Explanation:
Application Events in Aura components are used for communication between components that are not in the same containment hierarchy. An application event to alert users about the arrival of a guest at the front desk is appropriate because it allows any component within the app to listen and respond to the event, regardless of where it is located in the component hierarchy.

NEW QUESTION # 74
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