Oracle Database Discussions

hi
I run following command but not working why ?

according oracle document we can reset parameters but not working .

Oracle - 9i & OS - Redhat Linux
Thanks


SQL> alter system set sql_trace=true scope=both;

System altered.

SQL> show parameter sql_trace;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
sql_trace boolean TRUE
SQL> alter system reset sql_trace scope=both;
alter system reset sql_trace scope=both
*
ERROR at line 1:
ORA-00905: missing keyword


SQL> alter system reset sql_trace ;
alter system reset sql_trace
*
ERROR at line 1:
ORA-00905: missing keyword

SQL> alter system reset sql_trace scope=both sid='dbsd';

SQL> show parameter sql_trace;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
sql_trace boolean TRUE