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Lesson 17 of 18 · 10–15 min

Why Asynchronous Apex Exists

A strong Apex foundation prevents small syntax lessons from turning into unsafe production patterns.

Learning sequence · data model first, security layers next
  1. What CRM and Salesforce Do
  2. The Salesforce Ecosystem and Major Clouds
  3. Org, App, Object, Field, and Record
  4. Standard and Custom Objects
  5. Common Standard Objects
  6. Field Types and Data Quality
  7. Objects, Fields & Records
  8. Lookup vs Master-Detail
  9. Many-to-Many Relationships and Junction Objects
  10. Profiles, Permission Sets & Object Access
  11. Field-Level Security
  12. OWD and Least-Privilege Record Access
  13. Opening Access: Role Hierarchy, Sharing Rules, Public Groups & Apex Sharing
  14. Apex First Steps
  15. Variables and Collections
  16. SOQL and DML Basics
  17. Why Asynchronous Apex Exists
  18. REST Callout Introduction

Your focus

Prepare for Your Next Developer Role

FULL · Review • Apply • Practice

  • Apply the concept in a bulk-safe, testable implementation.

Learning objective

Explain and apply why asynchronous apex exists in a small Salesforce scenario.

The concept

Sometimes we do not want all work inside the same transaction. A future method is a basic legacy entry point; Queueable is the preferred richer mechanism for most new background work; Batch handles large datasets in chunks; and Schedulable starts work at a planned time. Async changes timing and limits, but does not excuse unsafe design.

Worked example

Enqueue a job after committing business data, pass stable identifiers, query fresh state in execute, and monitor failures.

Read the requirement, identify the records and transaction, run the smallest example in a safe environment, inspect the result, and then add tests and bulk considerations before production use.

Choose an execution shape

  1. 1.Synchronous

  2. 2.@future

  3. 3.Queueable

  4. 4.Batch

  5. 5.Schedulable

  • Synchronous connects to @future
  • Synchronous connects to Queueable
  • Synchronous connects to Batch
  • Synchronous connects to Schedulable

A basic future method

apex

public class ContactSync {
    @future(callout=true)
    public static void sendContacts(Set<Id> contactIds) {
        // Query current records, then make the callout.
    }
}

A minimal Queueable job

apex

public class RecalculateAccounts implements Queueable {
    private Set<Id> accountIds;
    public RecalculateAccounts(Set<Id> accountIds) { this.accountIds = accountIds; }
    public void execute(QueueableContext context) {
        // Query current state and perform bulk work.
    }
}
System.enqueueJob(new RecalculateAccounts(accountIds));

Common mistake

Copying a single-record example into automation without considering collections, limits, errors, or testability.

Interview angle

Explain the platform reason behind the syntax and state how the approach behaves for many records.

Pause and apply

What changes when this operation handles 200 records instead of one?

Official references

Reviewed 2026-09-23. Examples are illustrative; no code is executed here.

Key takeaways

  • Apex runs inside governed transactions.
  • Collections and bulk operations are the normal production shape.

Practice next

No linked assessment is available for this lesson. Use the pause-and-apply question to check your reasoning.

Reading these lessons does not yet save completion. Challenge results continue to provide assessment evidence.