select
TABLESPACE_NAME, -- TABLESPACE_NAME VARCHAR2(30)
FILE_ID, -- FILE_ID NUMBER
BYTES_USED, -- BYTES_USED NUMBER
BLOCKS_USED, -- BLOCKS_USED NUMBER
BYTES_FREE, -- BYTES_FREE NUMBER
BLOCKS_FREE, -- BLOCKS_FREE NUMBER
RELATIVE_FNO -- RELATIVE_FNO NUMBER
from
GV$TEMP_SPACE_HEADER
where
inst_id = USERENV('Instance')