I need some urgent help on creating of temporary tablespace in oracle
7.2

when i exec this statement
CREATE TABLESPACE TEMP
DATAFILE '/u03/oradata/F/TempF_01.dbf' SIZE 1950M
DEFAULT STORAGE ( INITIAL 1000M NEXT 480M MINEXTENTS 1 MAXEXTENTS
121 PCTINCREASE 0 )
TEMPORARY;
---it says invalid create tablespace statement

so I

CREATE TABLESPACE TEMP
DATAFILE '/u03/oradata/F/TempF_01.dbf' SIZE 1950M
DEFAULT STORAGE ( INITIAL 1000M NEXT 480M MINEXTENTS 1 MAXEXTENTS
121 PCTINCREASE 0 );
----without the temporary word and I am able to create

when I want to alter

alter tablespace temp temporary; ----it says invalid alter statement.

can I know what i did wrong. Please help

Regards,
Cindy