batchapex-150603234116-lva1-app6892

7/25/2019 batchapex-150603234116-lva1-app6892

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Batch Apex

Dave Helgerson

davehelgerson.com

@davehelgerson


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Batch Apex Agenda

High level description of Batch Apex

How to use Batch Apex

Simple Code Examples Demos in a Salesforce org

Questions


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hat is Batch Apex!

Batch Apex is a wa" to processmillions of records on the Salesforceplatform


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How does Batch Apex wor#!

Start $" de%ning a dataset to processthrough Data$ase.Quer"&ocator

Custom 'terator

&ist Collection


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How does Batch Apex wor#!(cont.)

*hen+ the dataset is divided intosmaller chun#s of records Each chun# of dataset processes as a

separate transaction

Si,e of each chun# is de%ned whensu$mitting the Batch process


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-inall"+ after all chun#s of the datasethave $een processed+ postprocessing can $e run Send Emails

pdate aggregate totals


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De%ne the dataset

Divide and process

/ost processing


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How does Batch Apex run!

As"nchronousl"+ of course0

&i#e @future methods or Queuea$leApex


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hat conditions are ideal for Batch

Apex!

*as#s that involve large datasets orare processing intensive

Source of data is from a singledata$ase o$1ect+ and Dataset can $eretrieved with a single S2Q&statement

Each unit of wor# is independent

3ot time4critical


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5ive me scenarios for Batch Apex

processing

6ecord 2wnership 6eassignment

Data 6etention

Data Cleansing 6ecalculating Apex 7anaged Sharing

2ther 7ass 6ecord pdate


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hat does the code loo#li#e!

Class de%nition implements theDatabase.Batchableinterface

*hree methods are re8uired start()

execute()

finally()


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hat does the code loo# li#e!(cont.)

Quer"&ocator Example


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&ist Example


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'tera$le Example


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Additional Class Attri$utes Database.AllowsCallouts

9:: callouts per transaction (inter ;9


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How do ' run a 1o$!

Batch Apex is invo#ed programmaticall"with Database.executeBatch orSystem.scheduleBatch

=isualforce page controller Apex trigger

A1ax *ool#it

Execute Anon"mous from -orce.com 'DE orDeveloper Console

Scheduled >o$


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How do ' run a 1o$! (cont.)

Database.executeBatch

Su$mits a 1o$ to the 8ueue

/arameters? 'nstance of the class

Scope (optional)

Example? Database.executeBatch(new xam!leBatch()"

#$$)%


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System.scheduleBatch

Creates a scheduled 1o$

/arameters?

'nstance of the class>o$ name

*ime interval+ in minutes+ after which the 1o$should start executing

Scope (optional) Example?

System.scheduleBatch(new xam!leBatch()"

&'est&" " #$$)%


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>o$ is su$mitted to the 8ueue < 1o$s can $e processing at once

9:: 1o$s can $e in the 8ueue at once. -lex Queue (Spring 9o$ 'd is returned*rac# progress $" the 1o$ 'd


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How do ' schedule a 1o$!

Scheduling from the ' Setup 4 Develop 4 Apex Classes 4 Schedule

Apex $utton


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How do ' schedule a 1o$!(cont.)

Scheduling in Apex system.schedule()

3ame

Cron expression 'nstance of Schedula$le class

Example? system.schedule(&y Scheduled *ob&"

&$ # + + + ,&" new xam!leSchedulable())%


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How do ' monitor a 1o$!

Setup 4 7onitor 4 >o$s 4 Apex >o$s

Shows active and completed 1o$information


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How do ' monitor a 1o$!(cont.)

As"ncApex>o$ Accessi$le in Apex


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How do ' test Batch Apex!

se *est.start*est() and*est.end*est()

As"nchronous processes runs"nchronousl" when the

*est.end*est() command executes

*he execute() method ma" onl" $e

invo#ed once


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How do ' test Batch Apex!


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Considerations Summar"

Quer"&ocator 4 maximum of


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Demo

Su$mitting

Scheduling

7onitoring


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Questions!

davehelgerson.com

@davehelgerson

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