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This article intents to show how we can save state of batch class member variables for all serial batch jobs running in background for a single batch job.

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  • When you want to report the batch execution status.
  • Calculate records failed/passed on some criteria.
  • See most common error occurred while batch run etc.

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Lets take a simple example for sending email with all errors occurred when a batch job is finished execution.

public class MyBatchUpload implements Database.Stateful, Database.Batchable < sObject >
{      public List < String >
errors {         get;         set;     }      public List < MyCustomObject__c >
start(Database.BatchableContext BC) {         return [SELECT Id, Name FROM MyCustomObject__c];     }      public void execute(Database.BatchableContext BC, List < MyCustomObject__c >
scope) {         Savepoint sp = Database.setSavepoint();         Database.DMLOptions dml = new Database.DMLOptions();         dml.DuplicateRuleHeader.allowSave = false;         Database.SaveResult[] srList = Database.insert(scope, dml);         for (Database.SaveResult sr: srList) {             if (!sr.isSuccess()) {                 for (Database.Error err: sr.getErrors()) {                     errors.add(err.getStatusCode() + ', MESSAGE=[' + err.getMessage() + '], FIELDS=[' + err.getFields() + ']');                 }             }         }     }      public void finish(Database.BatchableContext BC) {         //*** Here you can use the errors list and send an email or save as file **         //*** for every run it keeps on maintaining the state of errors list so that you can use it in finish method for some metrics or progress purpose **     }  }