Have you ever wanted to learn more about Oracle compression, and some of the associated techniques with reducing your data footprint? If so, today is your lucky day! Check out these My Oracle Support articles, and the free documentation PDFs to see if there is anything you might be able to pick up and use!
DBMS_REDEFINITION ONLINE REORGANIZATION OF TABLES - 149564.1
How to Reorganize a Table - 151588.1
How to Re-Organize a Table Online - 177407.1
Master Note for OLTP Compression - 1223705.1