ETL ??? The Wikipedia Definition ?????? Extract, transform and load (ETL) is a process in database usage and especially in data warehousing that involves: ?????? Extracting data from outside sources ?????? Transforming it to fit operational needs ?????? Loading it into the end target (DB or data warehouse) <a href="http://en.wikipedia.org/wiki/Extract,_transform,_load26">http://en.wikipedia.org/wiki/Extract,_transform,_load26</a> ??2012 Cloudera, Inc.