Getting started with Asynchronous Apex in Salesforce

1. Path to Code
Begin Your Salesforce Coding Adventure

2. Episode 19
Asynchronous Apex - Batch Apex & Schedulers

3. • Enterprise Solutions Architect
• Global Community Speaker
Jigar Shah
@jigarshah189

4. Agenda
• Demystifying Async Processing
• Understanding Batch Apex
• Anatomy of a Batch Job
• Understanding Scheduled Apex
• Decoding Cron Expressions
• Considerations for Scheduled Apex
• Q&A

5. Some Housekeeping Rules…
• Mute your mic
• Keep adding questions in Zoom Q&A Window
• No questions are silly!
• Questions will be answered in the last 15 mins of this session

6. Demystifying Asynchronous Processing
Start
Immediate
Results
Required?
Asynchronous
Processing
Synchronous
Processing
Future Methods
Queueable Apex
Batch Apex
Scheduled Apex
Triggers
• User Efficiency
• Scalability
• Higher Limits
Yes
No

7. Understanding Batch Apex
Start
Success
Failure
Partial
SuccessJob
(Job 1)
Job 1 Job n
Job Submitted
QUEUED FAILED
COMPLETED
PROCESSINGPREPARING
Job 2
ABORTED
start() is invoked &
processing chunks
are created

8. Anatomy of a Batch Job
1
2
3
4

9. Demo 1
Writing Your First Batch Job

10. Maintaining State in Batches

11. Demo 2
Writing Stateful Batch Jobs

12. Considerations for Batch Apex
 50 million records can be processed
 Use Batch Apex only if there are more than 1 batches to be processed else opt for Queueable
Apex
 Fine tune your SOQL query to minimize QueryLocator records
 Invocation from Triggers may lead to uncontrolled executions
 Implement Database.AllowsCallouts to make Webservice calls

13. Understanding Scheduled Apex
Start
Success
Failure
Partial
SuccessJob
(Job 1)
Job 1 Job n
Job Submitted
QUEUED FAILED
COMPLETED
PROCESSING
SCHEDULING
Job 2
ABORTED
Schedules based on User’s
Timezone & executes in
System Mode

14. Decoding Cron Expressions

15. Anatomy of a Scheduled Apex Job
1
2

16. Demo 3
Writing a Cron Job

17. Considerations for Schedulers
 Maximum 100 jobs can be scheduled concurrently
 Limit on maximum number of Scheduled Apex invocations on a per 24 hour
basis
 Synchronous Web service callouts are not supported from Scheduled Apex

18. Resources
 Custom Iterators
 Apex Developer Guide
 Execution Governor Limits

19. Trailhead Modules
Async Apex

20. Q & A

21. Thank You

22. Subscribe