Calculate oracle database size.

By -
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.

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