How to get the TableSpace usage in Oracle

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To get the table space usage in oracle use this query

select    a.TABLESPACE_NAME,
ROUND(a.BYTES/1024000) “Used (MB)”,
ROUND(b.BYTES/1024000) “Free (MB)”,
round(((a.BYTES-b.BYTES)/a.BYTES)*100,2) “% USED”
from
(
select  TABLESPACE_NAME,
sum(BYTES) BYTES
from    dba_data_files
group   by TABLESPACE_NAME
)
a,
(
select  TABLESPACE_NAME,
sum(BYTES) BYTES ,
max(BYTES) largest
from    dba_free_space
group   by TABLESPACE_NAME
)
b
where    a.TABLESPACE_NAME=b.TABLESPACE_NAME
and a.TABLESPACE_NAME like ‘%’
order      by ((a.BYTES-b.BYTES)/a.BYTES) desc ;

If You want to list a particular table space  replace  a.TABLESPACE_NAME like ‘%’ with a.TABLESPACE_NAME like ‘MY_TABLE_SPACE’

To get the temporary tablespace usuage use this query

SELECT tablespace_name, SUM(bytes_used), SUM(bytes_free)
FROM V$temp_space_header
GROUP BY tablespace_name;