Free DEV-450 sample questions

Correct answer: A custom controller that uses a wrapper class to hold each OpportunityLineItem record and a boolean for selection.

A custom controller with a wrapper class is the most robust solution. The wrapper class can encapsulate the `OpportunityLineItem` sObject and any additional properties needed for the page, such as a boolean for row selection or temporary edit values. This approach provides maximum flexibility for handling complex page logic, especially for inline editing of multiple records, without being constrained by the features of standard controllers. The save method can then iterate through the list of wrappers, collect the modified records, and perform a single DML update, which is efficient.

Correct answer: An Apex trigger on the Opportunity object.

An Apex trigger is the best choice because the requirement includes making a web service callout. While Flow can make callouts, performing a callout directly from a record-triggered path (like a trigger) must be done asynchronously to avoid holding up the database transaction. An Apex trigger can invoke an asynchronous Apex method (using the `@future(callout=true)` annotation) to perform the web service call. This cleanly separates the synchronous record update from the asynchronous external communication, which is a best practice and necessary to avoid a `CalloutException`.

Correct answer: Query for the RecordTypeId using `Schema.SObjectType.Case.getRecordTypeInfosByName().get('MyRecordTypeName').getRecordTypeId()`.

Using the Schema methods like `getRecordTypeInfosByName()` is the best practice for obtaining RecordType IDs within a test context. This approach is dynamic and does not rely on hard-coded IDs, which can change between environments (e.g., sandboxes, production). It also avoids making a SOQL query, which consumes a governor limit. Furthermore, it does not require `SeeAllData=true`, ensuring the test remains isolated and reliable.

Correct answer: A Master-Detail relationship.

A Master-Detail relationship is the correct choice. This relationship type creates a tight coupling where the detail (child) record's existence depends on the master (parent) record. Key features that meet the requirements are: 1) The detail record inherits the sharing and security settings of the master record. 2) Deleting the master record automatically deletes all related detail records (cascade delete). 3) The relationship field on the detail record is required by default, ensuring every client is assigned to an advisor.

Correct answers: Change Sets; Salesforce CLI (SFDX)

Change Sets are a native Salesforce UI-based tool used to move metadata between connected orgs (like from a sandbox to another sandbox or production). They can package Apex classes, Lightning Web Components, and Profiles, meeting all the requirements of the scenario.

The Salesforce CLI (SFDX) is a powerful command-line tool for Salesforce development and deployment. A developer can retrieve the specified metadata components from the source org and deploy them to the target org. This method offers more control, is scriptable, and is a core part of modern DevOps processes.

Correct answer: Code execution resources are shared among all customers on the same instance, enforced by governor limits.

In Salesforce's multi-tenant architecture, all customers (tenants) on a given instance share the same application and hardware resources. To prevent any single tenant from monopolizing these resources and degrading performance for others, Salesforce enforces strict governor limits on code execution (e.g., CPU time, heap size, number of SOQL queries). This forces developers to write efficient, bulkified code.

Correct answer: A static boolean variable in a helper class to control execution flow.

The standard and most effective pattern to prevent trigger recursion is to use a static boolean variable. Static variables retain their value for the duration of a single transaction. The trigger logic can check the value of this variable; if it's `false`, the logic executes and sets the variable to `true`. If the trigger is re-entered within the same transaction, the check will find the variable is `true`, and the logic will be skipped, thus breaking the recursive loop.

Correct answer: True

This is true. A single LWC JavaScript file can use ES6 import statements to bring in `@AuraEnabled` static methods from various Apex classes. Each import statement specifies the method and the class it belongs to, allowing the component to call server-side logic from multiple sources as needed.

Correct answer: A parent-to-child subquery, selecting child records within the main SELECT statement.

To query child records from a parent, a parent-to-child subquery (also known as a left outer join) is used. The syntax involves nesting a `SELECT` statement for the child objects inside the field list of the parent query. For standard relationships, the plural name of the child object is used (e.g., `(SELECT Id, Name FROM Contacts)`).

Correct answer: Inefficient code within the `execute` method, such as nested loops or complex calculations, is consuming excessive CPU time per batch.

The `Apex CPU time limit exceeded` error in a batch job typically points to inefficient code within the `execute` method. Each execution of this method runs in its own transaction with its own set of governor limits. If the logic inside the `execute` method (e.g., nested for-loops, complex string manipulations, inefficient algorithms) takes too long to run for the given batch of records, it will exceed the CPU time limit (60,000 ms for asynchronous Apex). While a large batch size can contribute, the root cause is usually the code's inefficiency per record.