Introduction
Welcome to the final part of our series on Salesforce Interview Questions on Asynchronous Apex!
In this post, we’ll wrap up our exploration with 25 advanced questions that dive into the details of Batch Apex, Queueable Apex, and Scheduled Apex. These questions are designed to challenge your understanding, test your knowledge of best practices, and prepare you for complex real-world scenarios.
Whether you’re preparing for an interview or looking to refine your development skills, these questions will take your knowledge to the next level.
If you missed Part 1 & Part 2 of our series on 25 Salesforce Interview Questions on Asynchronous Apex, be sure to check it out in the links below!
Let’s dive in and complete our journey into mastering Asynchronous Apex!
51. What is the maximum number of Batch Apex jobs that can be executed concurrently?
Answer:
The maximum is 5 active or queued Batch Apex jobs at a time.
Explanation:
This limit ensures that the system doesn’t get overloaded with too many concurrent batch jobs.
52. Can you use System.debug in a Future Method?
Answer:
Yes, you can use System.debug in a Future Method.
Explanation:
Debug logs from Future Methods can be viewed in the Salesforce debug logs.
53. What is the purpose of the Database.executeBatch method’s optional batch size parameter?
Answer:
The optional batch size parameter allows you to specify the number of records processed in each batch.
Explanation:
The default is 200 records, but you can adjust it to optimize performance.
54. Can you call a Future Method from a Scheduled Apex job?
Answer:
Yes, you can call a Future Method from a Scheduled Apex job.
Explanation:
Scheduled Apex can initiate asynchronous tasks like Future Methods.
55. What is the maximum number of Future Methods that can be called in a single transaction?
Answer:
The maximum is 50 Future Method calls per transaction.
Explanation:
This limit prevents excessive background processing.
56. Can you use Database.Stateful in Queueable Apex?
Answer:
No, Database.Stateful is not used in Queueable Apex.
Explanation:
Queueable Apex maintains state automatically, so Database.Stateful is unnecessary.
57. What is the purpose of the Database.BatchableContext object in the Finish method?
Answer:
The Database.BatchableContext object provides information about the Batch Apex job, such as the job ID.
Explanation:
This is useful for logging or tracking the job’s completion.
58. Can you call a Queueable Apex job from a Scheduled Apex job?
Answer:
Yes, you can call a Queueable Apex job from a Scheduled Apex job.
Explanation:
Scheduled Apex can initiate Queueable jobs for complex asynchronous tasks.
59. What is the purpose of the Database.QueryLocator in Batch Apex?
Answer:
The Database.QueryLocator is used in the Start method to retrieve records for processing.
Explanation:
It is ideal for large datasets because it handles query results efficiently
60. Can you use System.schedule in a Trigger?
Answer:
No, you cannot use System.schedule in a Trigger.
Explanation:
Scheduled Apex is designed to run at specific times, not in response to triggers.
61. What is the purpose of the Database.RaisesPlatformEvents annotation in Queueable Apex?
Answer:
The Database.RaisesPlatformEvents annotation allows a Queueable Apex job to publish platform events.
Explanation:
Platform events are used for real-time integrations and notifications.
62. Can you use Database.rollback in a Future Method?
Answer:
No, you cannot use Database.rollback in a Future Method.
Explanation:
Future Methods run in a separate transaction, so they cannot roll back the calling transaction.
63. What is the purpose of the Database.BatchableContext.getJobId method?
Answer:
The Database.BatchableContext.getJobId method returns the ID of the Batch Apex job.
Explanation:
This is useful for tracking and logging purposes.
64. Can you call a Future Method from a Queueable Apex job?
Answer:
No, you cannot call a Future Method from a Queueable Apex job.
Explanation:
Future Methods are limited and cannot be called from Queueable jobs.
65. What is the purpose of the Database.AllowsCallouts annotation in Batch Apex?
Answer:
The Database.AllowsCallouts annotation allows a Batch Apex job to make callouts to external systems.
Explanation:
Without this annotation, Batch Apex cannot make callouts.
If you want to learn more about Asynchronous Apex and its different types—Future Method, Batch Apex, Queueable Apex, and Scheduled Apex—check out the posts below!
66. Can you use SOSL in a Queueable Apex job?
Answer:
Yes, you can use SOSL in a Queueable Apex job.
Explanation:
SOSL is useful for searching across multiple objects.
67. What is the purpose of the Database.Stateful interface in Batch Apex?
Answer:
The Database.Stateful interface allows you to maintain state across batch executions.
Explanation:
Without it, variables are reset after each batch.
68. Can you call a Batch Apex job from a Queueable Apex job?
Answer:
Yes, you can call a Batch Apex job from a Queueable Apex job.
Explanation:
This allows you to combine the strengths of both types of asynchronous processing.
69. What is the purpose of the Database.executeBatch method’s optional scope parameter?
Answer:
The optional scope parameter allows you to specify the number of records processed in each batch.
Explanation:
The default is 200 records, but you can adjust it to optimize performance.
70. Can you use DML in a Scheduled Apex job?
Answer:
Yes, you can use DML in a Scheduled Apex job.
Explanation:
Scheduled Apex can perform database operations like inserts, updates, and deletes.
71. What is the purpose of the Database.QueryLocator in Queueable Apex?
Answer:
The Database.QueryLocator is not used in Queueable Apex.
Explanation:
Queueable Apex is designed for task-based processing, not large dataset processing.
72. Can you call a Future Method from a Batch Apex job?
Answer:
No, you cannot call a Future Method from a Batch Apex job.
Explanation:
Future Methods are limited and cannot be called from Batch Apex.
73. What is the purpose of the Database.BatchableContext object in the Execute method?
Answer:
The Database.BatchableContext object provides information about the Batch Apex job, such as the job ID.
Explanation:
This is useful for tracking and logging purposes.
74. Can you use System.debug in a Queueable Apex job?
Answer:
Yes, you can use System.debug in a Queueable Apex job.
Explanation:
Debug logs from Queueable Apex can be viewed in the Salesforce debug logs.
75. What is the purpose of the Database.RaisesPlatformEvents annotation in Batch Apex?
Answer:
The Database.RaisesPlatformEvents annotation allows a Batch Apex job to publish platform events.
Explanation:
Platform events are used for real-time integrations and notifications.
Conclusion
With this final set of 25 questions, we’ve covered a comprehensive range of topics on Asynchronous Apex, from foundational concepts to advanced techniques.
By now, you should have a deep understanding of how to leverage Future Methods, Batch Apex, Queueable Apex, and Scheduled Apex to build efficient, scalable, and high-performing solutions on the Salesforce platform.
We hope this three-part series has been a valuable resource for your Salesforce journey, whether you’re preparing for an interview or enhancing your development skills.
Let me know in the comments section if you are looking for more questions on Async Apex. Keep learning and building amazing solutions on the Salesforce platform!
