select
a.TABLESPACE_NAME,
a.total,nvl(b.used,0) USED,
nvl((b.used/a.total)*100,0) PCT_USED
from
(select TABLESPACE_NAME,
sum(bytes)/(1024*1024) total
from sys.dba_data_files
group by TABLESPACE_NAME) a,
(select TABLESPACE_NAME,bytes/(1024*1024) used
from sys.SM$TS_USED) b
where a.TABLESPACE_NAME=b.TABLESPACE_NAME(+);
select fs.tablespace_name tablespace,
(df.totalspace - fs.freespace) used,
fs.freespace Free,
df.totalspace Total,
round(100*(fs.freespace/df.totalspace)) pct
from(
select tablespace_name,round(sum(bytes)/1048576) totalspace
from dba_data_files
group by tablespace_name
)df,
(
select tablespace_name,
round(sum(bytes)/1048576) freespace
from dba_free_space
group by tablespace_name
)fs
where df.tablespace_name=fs.tablespace_name
