Apex Trigger Interview Questions

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Apex Trigger Interview Questions

Key Questions to Prepare for Apex Trigger Interviews

Apex Trigger Interview Questions

Apex Trigger interview questions typically focus on assessing a candidate's understanding of Salesforce's Apex programming language and its application in the context of automation and customization of Salesforce platform. Common interview topics may include trigger syntax and best practices, governor limits, bulkification techniques, trigger context variables, handling trigger recursion, and integrating triggers with other Salesforce features such as workflows and process builder. Candidates may also be asked about debugging techniques, test coverage requirements, and considerations for writing efficient and scalable triggers. Demonstrating hands-on experience in developing triggers, understanding business requirements, and problem-solving skills through practical scenarios are key to succeeding in Apex Trigger interviews.

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1 - What is an Apex trigger?

An Apex trigger is a code that executes before or after specific data manipulation language (DML) events occur on Salesforce records within Salesforce, such as insertions, updates, or deletions.

2) When should you use an Apex trigger?

Apex triggers are used when you need to perform custom actions like validation, updating related records, or invoking flows and processes during DML operations.

3) How can you avoid governor limits in Apex triggers?

To avoid hitting governor limits, you can bulkify your trigger logic by handling multiple records in a single operation rather than processing them individually.

4) What is trigger context in Salesforce?

Trigger context refers to the specific context in which the trigger is being executed, such as before insert, after update, etc. This context helps you determine the appropriate actions to take during trigger execution.

5) Can we call a trigger recursively in Salesforce?

Yes, triggers can be called recursively in Salesforce, but you should be cautious to prevent entering into an infinite loop by implementing recursion control mechanisms like static variables.

6) How can you write unit tests for Apex triggers?

To write unit tests for Apex triggers, you should create test data, perform DML operations, and verify the trigger behavior using System.assertEquals statements.

7) What are the best practices for writing efficient Apex triggers?

Some best practices for writing efficient Apex triggers include using helper classes to encapsulate logic, limiting SOQL queries, and avoiding trigger logic in utility classes to promote reusability.

8) How do you handle exceptions in Apex triggers?

You can handle exceptions in Apex triggers by using try catch blocks to catch exceptions and handle them appropriately, such as by logging errors or implementing graceful error handling mechanisms.

9) What is the difference between triggers and workflows/process builders?

Triggers are written in Apex code and offer more customization and flexibility compared to workflows and process builders, which are declarative tools for configuring automated processes in Salesforce without code.

10) Can triggers be deactivated or paused in Salesforce?

Yes, triggers can be deactivated or paused in Salesforce by using metadata tools like the Salesforce Developer Console or Salesforce DX to modify the trigger metadata and temporarily disable its execution.


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