Select round((f.bytes_free + f.bytes_used) / 1024 / 1024, 2)
"total MB",
       round(((f.bytes_free + f.bytes_used) - nvl(p.bytes_used,
0)) / 1024 / 1024, 2) "Free MB" ,
       d.file_name "Datafile name",
       round(nvl(p.bytes_used, 0)/ 1024 / 1024, 2) "Used MB",
       round((f.bytes_free + f.bytes_used) / 1024, 2) "total KB",
       round(((f.bytes_free + f.bytes_used) - nvl(p.bytes_used,
0)) / 1024, 2) "Free KB",
       round(nvl(p.bytes_used, 0)/ 1024, 2) "Used KB",
       0 "Fragmentation Index"
from   SYS.V_$TEMP_SPACE_HEADER f, DBA_TEMP_FILES d,
SYS.V_$TEMP_EXTENT_POOL p
where f.tablespace_name(+) = d.tablespace_name
and    f.file_id(+) = d.file_id
and    p.file_id(+) = d.file_id;

select sum(bytes)/1024/1024 from v$tempfile;
select * from v$tempseg_usage = v$sort_usage

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