To know the amount of free space in a tablespace

hi,
I'm learning oracle 9i release 9.2.0.1.0 .I'd created a tablespace 'TOOLS' for being used as the default tablespace for Statspack.
I wish to know the amount of free space available in this tablespace. For this purpose I ran the following query but there was no rows selected :-
SQL> select tablespace_name,bytes from dba_free_space
2 where tablespace_name='TOOLS';
no rows selected
SQL> select name from v$tablespace;
NAME
CWMLITE
DRSYS
EXAMPLE
INDX
ODM
SYSTEM
TOOLS
UNDOTBS1
USERS
XDB
TEMP
Can anyone tell the reason for this.

I tried your query
SQL> select TABLESPACE_NAME,
2 sum(BYTES) Total_free_space,
3 max(BYTES) largest_free_extent
4 from dba_free_space
5 group by TABLESPACE_NAME;
♀TABLESPACE_NAME TOTAL_FREE_SPACE LARGEST_FREE_EXTENT
CWMLITE 11141120 10878976
DRSYS 10813440 10813440
EXAMPLE 131072 131072
INDX 26148864 26148864
ODM 11206656 11206656
SYSTEM 3211264 3080192
UNDOTBS1 199229440 196149248
USERS 26083328 26083328
XDB 196608 196608
9 rows selected.
Again there were no rows for TOOLS tablespace.

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