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| Section | Objectives |
|---|---|
| Topic 1: Advanced Apex Programming | - Advanced Apex design patterns
|
| Topic 2: Asynchronous Apex | - Scheduled and future methods
|
| Topic 3: Testing, Debugging, and Deployment | - Deployment and debugging
|
| Topic 4: Integration and APIs | - External system integration
|
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質問 # 94
Which of the following standard fields are indexed? (Choose three.)
正解：A、B、C
質問 # 95
Employee_c is a Child object of Company_c. The Company_c object has an external Id field Company_Id_c.
How can a developer insert an Employee_c record linked to Company_c with a Company_Id_c of '999'?
Employee_c emp = new Employee_c(Name='Developer'); emp.Company_r = '999'
正解：C
質問 # 96
A developer needs to implement a system audit feature that allows users, assigned to a custom profile named
"Auditors", to perform searches against the historical records in the Account object. The developer must ensure the search is able to return history records that are between 6 and 12 months old. Given the code below, which select statement should be inserted as a valid way to retrieve the Account History records?4445 Java Date initialDate = System.Today().addMonths(-12); Date endDate = System.Today().addMonths(-6);
// Insert SELECT statement here
正解：A
解説：
To query history records for a standard object like Account, the developer must use the correct API name, which is AccountHistory (not Account_History). When filtering for a range of dates, SOQL provides the BETWEEN operator, which makes the query cleaner and more readable. Option C uses both the correct object name and the BETWEEN syntax, making it the most efficient solution.
In SOQL, CreatedDate BETWEEN :initialDate AND :endDate is shorthand for CreatedDate >= :initialDate AND CreatedDate <= :endDate. In the provided code, initialDate is 12 months ago (the older date) and endDate is 6 months ago (the more recent date). Therefore, the range correctly captures records between those two timestamps.
Option A and B use an incorrect object name (Account_History). Option D uses the incorrect comparison operator => (the correct operator is >=). Furthermore, Option C follows the best practice for date range queries in Apex by using bind variables with the standard AccountHistory object, ensuring the "Auditors" profile can retrieve the necessary historical data within the platform's audit and security constraints.
質問 # 97
Refer to the Aura component below:
HTML
<aura:component>
<aura:attribute name="contactInfo" type="Object"/>
<aura:attribute name="showContactInfo" type="boolean" default="true"/>
<aura:handler name="init" value="{!this}" action="{!c.init}"/>
<aura:if isTrue="{!v.showContactInfo}">
<c:contactInfo value="{!v.contactInfo}"/>
</aura:if>
</aura:component>
A developer receives complaints that the component loads slowly. Which change can the developer implement to make the component perform faster?
正解：A
解説：
In Aura components, the <aura:if> tag is "lazy." It does not instantiate or render the components within its body until its isTrue expression evaluates to true. In the provided code, showContactInfo is defaulted to true.
This means that when the parent component begins its initialization, it immediately starts creating and rendering the child component <c:contactInfo> simultaneously.
By changing the default for showContactInfo to "false" (Option C), the developer implements a "Lazy Loading" pattern. The parent component will load quickly because it skips the heavy lifting required to render the child. The init handler then runs, retrieves the necessary data, and sets the boolean to true only when the data is ready. This improves the "perceived performance" and the Initial Page Load time.
Option A is incorrect because it increases the complexity and weight of the parent component, likely making it slower. Option B (changing to a Map) does not fundamentally affect the rendering engine's speed. Starting with the display attribute as false ensures the browser only renders what is absolutely necessary during the critical first few milliseconds of the page load.
質問 # 98
A developer is debugging an Apex-based order creation process that has a requirement to have three savepoints, SP1, SP2, and 5P3 {created in order), before the final execution of the process.
During the final execution process, the developer has a routine to roll back to SP1 for a given condition. Once the condition is fixed, the code then calls 2 roll back to SP3 to continue with final execution. However, when the roll back to SP3 is called, a Funtime error occurs.
Why does the developer receive a runtime error?
正解：D
解説：
Savepoints in Apex are markers within a transaction and rolling back to an earlier savepoint (SP1) invalidates any savepoints created after it. Thus, SP3 is invalidated when the code rolls back to SP1, causing a runtime error when a rollback to SP3 is attempted.
References: Apex Developer Guide - Savepoint and Transaction Control
質問 # 99
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