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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse Queueable Apex for discrete background work that should run outside the current transaction and benefits from a trackable job ID, complex input, or sequential stages. Choose Batch Apex for very large record sets that need chunking; consider Continuations when a Lightning UI must remain responsive during a long-running callout. Queueable execution is deferred until Salesforce has capacity, so enqueueing a job does not mean it will finish immediately.
When should I use Queueable Apex?
Queueable Apex is a good fit when the initiating transaction can continue without waiting for the work, and the work is suitable for asynchronous execution—such as a long-running database operation or an external web service callout. Salesforce recommends Queueable Apex over Apex future methods for new asynchronous Apex work. The official Apex Developer Guide explains the feature and its limits.
- You need richer inputs: Queueable jobs can receive non-primitive values, including sObjects and custom Apex types. Decide whether the job should use the values captured when it was enqueued or reread records at execution time; records may change while the job waits.
- You need to identify or monitor the job:
System.enqueueJob()returns an ID for the correspondingAsyncApexJobrecord, which can be queried or inspected in Apex Jobs. - You need sequential stages: A running Queueable can enqueue one successor. This supports deliberate serial workflows, not unlimited branching.
- The caller can tolerate delay: Salesforce schedules asynchronous work when system resources become available. Do not make a user-facing process depend on an immediate completion time.
Queueable vs. Batch Apex
The key distinction is whether the workload is a discrete job or a large population that should be divided into chunks. Salesforce’s asynchronous processing decision guide identifies Batch Apex as an option for large-volume processing.
| Question | Queueable Apex | Batch Apex |
|---|---|---|
| What fits best? | A discrete asynchronous task, or a serial sequence of stages. | A very large record population, especially when processing should be split into manageable chunks. |
| Can it process millions of records? | Not the default choice for a population that needs chunked processing. | Often the better starting point for millions of records that need chunking. |
| Can one execution launch more work? | A running Queueable can enqueue one child job, according to Salesforce Trailhead. | Choose based on the batch design and its requirements; do not assume Queueable’s one-child chain is an equivalent chunking mechanism. |
Use the size and shape of the work—not the fact that both options run asynchronously—to choose between them. A chain of Queueables is appropriate for serial stages; it is not a substitute for a design that deliberately divides a large record population into batches.
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Queueable Apex vs. future method
For a new asynchronous Apex implementation, Queueable is usually the stronger default. Salesforce states, “Salesforce recommends that you use Queueable Apex instead of Apex future methods.” Queueable provides a returned job ID, accepts non-primitive constructor state, and allows a running job to enqueue a successor. Future methods may still suit a simple method moved out of band when those capabilities are unnecessary, including some existing synchronous/asynchronous designs. The recommendation is not a reason to refactor every legacy future method automatically.
Can Queueable Apex make callouts?
Yes. Queueable Apex can perform external web service callouts when the job is designed and configured for callouts. It is appropriate when the initiating transaction need not wait for the external response. If a Lightning interaction needs a responsive experience around a long-running callout, compare Apex Continuations: Salesforce says one Continuation can contain up to three callouts and can support parallel callouts. A Continuation’s initial method cannot perform DML, although its callback can. See Salesforce’s Continuations documentation.
Can I enqueue Queueable Apex from a trigger?
Yes, but enqueueing from a trigger requires bulk and execution-context safeguards. Avoid a design that enqueues once per record: a single synchronous transaction can enqueue up to 50 Queueable jobs according to Trailhead, and asynchronous callers have stricter constraints. Salesforce Architects warns that direct trigger enqueueing can be risky; review its trigger automation decision guide when selecting an automation pattern.
- Bulkify the trigger caller and consolidate records into appropriately sized work.
- Check enqueue capacity for the current execution context rather than assuming the synchronous limit applies.
- For high-volume or event-driven automation, compare Queueable with Flow, platform events, and Change Data Capture against the requirements and platform limits.
What limits and failure cases should I plan for?
Enqueue limits are context-specific
The 50-job figure is for a synchronous transaction; it is not a general per-job or per-org allowance. Asynchronous callers and batch or trigger execution contexts can have stricter constraints. Check current Apex limits and the target org’s available capacity before deployment.
Daily capacity is shared
Queueable does not have a separate daily execution allocation. Queueable, Batch, future, and Scheduled Apex use the shared DailyAsyncApexExecutions limit. Salesforce Help describes a typical org-level allocation of 250,000 executions per 24 hours or a license-based calculation, whichever is greater; this is not a universal per-feature Queueable limit, and the applicable value depends on the org and current platform rules. Check the current Salesforce Help limit information and the org’s live limits rather than hard-coding that figure.
Rollback cancels the queued work
If the transaction that enqueues a Queueable rolls back, Salesforce does not process that queued job. Enqueueing therefore does not make work independent of the initiating transaction’s success.
Delay and failure need an operating plan
Execution order and timing depend on available system resources. For work with business consequences, record job state and errors, make processing idempotent where possible, and define retries or reconciliation for transient failures. A chain should also have an explicit recovery path if a stage fails rather than assuming its successor will run.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do I monitor a Queueable job?
Keep the ID returned by System.enqueueJob() when you need to associate the caller’s request with a job. Use that ID to inspect its AsyncApexJob record or locate it in Setup’s Apex Jobs page. Monitoring should support the business workflow: identify whether work is pending, completed, or failed, and provide a way to investigate errors and reconcile records that were not processed.
How to choose an asynchronous pattern
| Requirement | Pattern to evaluate |
|---|---|
| Discrete background task needing a job ID, rich inputs, or serial stages | Queueable Apex |
| Very large population requiring chunked processing | Batch Apex |
| Simple asynchronous method without a need for Queueable features | Future method may suffice, particularly in an existing design |
| Responsive Lightning experience around a long-running callout | Apex Continuations |
| Declarative or event-driven automation | Compare Flow, platform events, and Change Data Capture with Apex options and applicable limits |
Before choosing, assess data volume and chunking, serial versus independent work, whether the caller must wait or show an interactive result, the shape and freshness of inputs, monitoring and recovery needs, available enqueue and daily capacity, and whether the process belongs in Apex or another automation pattern.
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