SF-PD2 Advanced Developer Fundamentals Practice Question
A developer is implementing a custom Apex class that uses the Queueable interface to process a large number of records asynchronously. The class must be able to chain another job if there are more records to process. Which method should the developer use to enqueue the next job?
⚠ Common exam trap
The trap here is assuming that a Queueable class has a static enqueue method or that batch/scheduled jobs can be used interchangeably for chaining.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
System.enqueueJob(new MyQueueableClass());
To chain a Queueable job, the developer must call System.enqueueJob() from within the execute method of the current Queueable class, passing a new instance of the next job. This method is the only supported way to enqueue Queueable jobs. The other options refer to different asynchronous mechanisms or invalid syntax.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
System.schedule('NextJob', '0 0 0 * * ?', new MySchedulableClass());
Why it's wrong here
System.schedule() is used to schedule a job at a specific time using a Schedulable class. It is not used for chaining Queueable jobs from within an executing Queueable. This method would introduce unnecessary delay and complexity, and it does not support immediate chaining as required.
- ✗
MyQueueableClass.enqueue();
Why it's wrong here
There is no static enqueue() method on a class that implements Queueable. The correct way to enqueue a Queueable is via System.enqueueJob(). Attempting to call MyQueueableClass.enqueue() would result in a compile error because the method does not exist. This option is a common misconception.
- ✓
System.enqueueJob(new MyQueueableClass());
Why this is correct
System.enqueueJob() is the correct method to add a Queueable job to the queue. It can be called from within a Queueable's execute method to chain another job, allowing for sequential processing. This method is specifically designed for Queueable jobs and supports chaining up to a specified depth limit.
- ✗
Database.executeBatch(new MyBatchClass());
Why it's wrong here
Database.executeBatch() is used to submit a batch job, not a Queueable job. While batch jobs can also process large data, they are a different asynchronous mechanism and cannot be chained from within a Queueable execute method. Using this would mix asynchronous patterns and is not the intended way to chain Queueable jobs.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Salesforce exam blueprint
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