Laat de grootte van de database zien

col "Database Size" format a20
col "Free space" format a20
col "Used space" format a20
select	round(sum(used.bytes) / 1024 / 1024 / 1024 ) || ' GB' "Database Size"
,	round(sum(used.bytes) / 1024 / 1024 / 1024 ) - 
	round(free.p / 1024 / 1024 / 1024) || ' GB' "Used space"
,	round(free.p / 1024 / 1024 / 1024) || ' GB' "Free space"
from    (select	bytes
	from	v$datafile
	union	all
	select	bytes
	from 	v$tempfile
	union 	all
	select 	bytes
	from 	v$log) used
,	(select sum(bytes) as p
	from dba_free_space) free
group by free.p
/