global class UpdateContactAddresses implements

    Database.Batchable, Database.Stateful {

  // instance member to retain state across transactions

    global Integer recordsProcessed = 0;

    global Database.QueryLocator start(Database.BatchableContext bc) {

      return Database.getQueryLocator(

            ‘SELECT ID, BillingStreet, BillingCity, BillingState, ‘ +

            ‘BillingPostalCode, (SELECT ID, MailingStreet, MailingCity, ‘ +

           ‘MailingState, MailingPostalCode FROM Contacts) FROM Account ‘ +

            ‘Where BillingCountry = \’USA\”

       );

    }

   global void execute(Database.BatchableContext bc, List scope){

       // process each batch of records

List contacts = new List();

  for (Account account : scope) {

           for (Contact contact : account.contacts) {

                contact.MailingStreet = account.BillingStreet;

              contact.MailingCity = account.BillingCity;

               contact.MailingState = account.BillingState;

                contact.MailingPostalCode = account.BillingPostalCode;

                // add contact to list to be updated

                contacts.add(contact);

                // increment the instance member counter

                recordsProcessed = recordsProcessed + 1;

            }

        }

        update contacts;

    }

    global void finish(Database.BatchableContext bc){

        System.debug(recordsProcessed + ‘ records processed. Shazam!’);

        AsyncApexJob job = [SELECT Id, Status, NumberOfErrors,

            JobItemsProcessed,

           TotalJobItems, CreatedBy.Email

            FROM AsyncApexJob

           WHERE Id = :bc.getJobId()];

        // call some utility to send email

      EmailUtils.sendMessage(job, recordsProcessed);

    }

}