Dear All, Please I have a problem regarding sysaux tablespace. it is a database for BI & I need to purge unused space at sysaux & all other tablespaces if needed. to free unused space. I checked these options but didn't start them yet. what are the procedures that I should follow in such case, as data are very sensitive. alter table xxx deallocate unused space; alter index xxx deallocate unused space; alter table xxx coalesce; alter index xxx coalesce; Now I started to run exec dbms_stats.purge_stats(sysdate-4); It takes 2 days & still running. DB Version: 11.2.0.2 Enterprise Edition DB size: about 500 GB O.S: Windows 2008 Enterprise Edition R2 64 Bit Please check & advice. Thanks Regards,