The following are methods for Batchable.
public Void execute(Database.BatchableContext jobId, List<sObject> recordList)
Type: Void
public Void finish(Database.BatchableContext jobId)
Type: Void
public System.Iterable start(Database.BatchableContext jobId)
Type: System.Iterable
public Database.QueryLocator start(Database.BatchableContext jobId)
Type: Database.QueryLocator