Ace the Salesforce PDII Exam: Ultimate Preparation Guide

When developing a custom screen that requires both an Account and Contact to be created together, using setSavepoint() and rollback() within a try-catch block is a reliable way to ensure that if the Contact creation fails, the Account creation is also rolled back, maintaining data integrity.References: Apex Developer Guide - Savepoint and Transaction Control

Given the code snippet, the correct query to retrieve Account History records between 6 and 12 months old would be the one that includes a WHERE clause filtering records where the CreatedDate is greater than or equal to initialDate and less than or equal to endDate. Option B's statement does this correctly by using the >= and <= operators to define the range between initialDate (which is set to today's date minus 12 months) and endDate (set to today's date minus 6 months). Options A, C, and D either use incorrect comparison operators or compare against the wrong variables, resulting in an incorrect data set being returned.

References

• SOQL Date Formats and Date Literals: SOQL and SOSL Reference Guide

In a multi-currency Salesforce organization, displaying currency amounts according to the user's locale is crucial for ensuring data clarity and relevance. To achieve this, developers can leverage Salesforce's built-in capabilities to format field values directly within SOQL queries. The FORMAT() function is particularly useful as it formats currency fields according to the organization's locale settings. By using this function in a SOQL query, developers can ensure that the Amount and LastModifiedDate fields are displayed correctly. This method is more effective and efficient than post-processing the values in Apex, which would be required if using wrapper classes or REGEX expressions. Additionally, using the FOR VIEW clause in a SOQL query will mark records as recently viewed, which does not format the fields as per the user's locale.

References:

• SOQL FORMAT Function
• Working with Multi-Currency

If test failures are occurring in a sandbox but not in production and there have been no active code or metadata changes, it could be due to differences in the Salesforce release versions between the two environments. Sandboxes can be on preview instances which get upgraded to new releases before production instances. This can lead to differences in behavior and could affect test executions. Ensuring that both the sandbox and production are on the same release can resolve such issues. API version differences and parallel testing settings typically do not cause discrepancies if the code hasn't changed, and while using SeeAllData=true is generally not recommended due to its dependence on the organization's data, it's unlikely to be the cause if the issue is related to the environment rather than the data.

References:

• Sandbox Preview Instructions
• Understand the Salesforce Release Process

Use AuraHandledException in try-catch for custom errors. It enables sending meaningful, user-friendly error messages to the Lightning component.References: Handling Errors in Lightning Components

Salesforce validation rules are declarative and can be used to validate more than one field on an object and display multiple error messages. This approach requires minimal JavaScript code and uses Salesforce's built-in validation framework. References:

• Validation Rules

Static resources are ideal for efficient loading and caching of external files in Visualforce. They allow bundling and minimizing HTTP requests.References: Using Static Resources

The correct SOQL query to return a unique list of Contact records that have no 'Fulfilled' Orders is one that selects Ids from the Contact object where the Contact Id is not in the set of Contact Ids related to 'Fulfilled' Orders. This is done by a subquery that selects the Contact__c field from the Order__c records where the Status__c is 'Fulfilled'.References: SOQL and SOSL Reference Guide – Subqueries

For communication between unrelated Lightning web components that are in different DOM trees, the most suitable approach is to use the Lightning Message Service (LMS). This service allows components to communicate with each other using a message channel, which is particularly useful when the components are not in the same containment hierarchy. By publishing and subscribing to messages on a message channel, components can exchange data and notifications, which is ideal for the scenario described.

References:

• Lightning Web Components Developer Guide - Communicate Across the DOM with Lightning Message Service

Batch Apex is designed to handle large data operations by breaking the transaction into smaller batches. Scheduling a batch process to run daily enables the system to manage the deletion of large numbers of records efficiently, without hitting governor limits. It's the best practice for performing mass deletions on a regular schedule.

References:

• Using Batch Apex