The Oracle DBA's

select "Reserved_Space(GB)", "Reserved_Space(GB)" - "Free_Space(GB)" "Used_Space(GB)","Free_Space(GB)" from( select (select sum(bytes/(1024*1024*1024)) from dba_data_files) "Reserved_Space(GB)", (select sum(bytes/(1024*1024*1024)) from dba_free_space) "Free_Space(GB)" from dual ); Note: Used space is the actual database size. Thanks & Regards Nikhil Kumar.