Salesforce does not allow to perform DML operation more than 10K records in single transaction. Consider a situation where you have more than 10K records to perform DML operation. Due to Governing limitations of Salesforce (because of Multi-tenant architecture of Salesforce) you won’t be able to do the same. But Salesforce provided very nice feature of Batch Apex processing where you can process thousands of records.
Please follow following steps to implement Batch Apex
-> Create global apex class which extends Database.Batchable Interface because of which the Salesforce compiler will know, this class incorporates batch jobs
global class ClassName implements (Database.QueryLocator | Iterable)
Batch Apex
-> It contains three method:-
- Start Method:
Here you can write SOQL query to retrieve the records on which you want to perform the action. This method returns either Database.QueryLocator or Iterable that contains the records or sObjects. - Execute method
global void execute(Database.BatchableContext BC, list <P>){}
This method is used to collect the records coming from start method. You can use these records for further processing. - Finish method
global void finish(Database.BatchableContext BC){}
This method is called after completion of batch. So you can use this method for notification of completion of batch. When apex batch is executed then initializes and scheduled AsyncApexJob based on the batch.
Also, the next blog will cover the various aspects of “how to schedule the batch using Apex scheduler and View Schedule batches”.
For more detail you can use below guide: Check Now
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