Batch Apex Example to Update Contact Email Id

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global class ContactEmailUpdateBatch implements Database.Batchable < sObject > { global Database.QueryLocator start(Database.BatchableContext BC) { String query = ‘SELECT Id, Email FROM Contact’; return Database.getQueryLocator(query); } global void execute(Database.BatchableContext BC, List < Contact > scope) { for (Contact a: scope) { a.email = a.email + ‘.test’; } update scope; } global void finish(Database.BatchableContext BC) {} }

Executing the above batch class from the anonymous window of developer console:

1 2	ContactEmailUpdateBatch CEUB = new ContactEmailUpdateBatch(); Database.Executebatch(CEUB ,1);