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How large is the database,used and free space?



                                                                                                                                                                      
Scenario:
How large is the database,used and free space?

Solution:

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

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