Alter system reset give error

Question

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

Answer 1

The command can be used, it doesn't matter if this is a single instance or RAC, it will work on both environments.
SQL> show parameter audit_trail
NAME                                 TYPE        VALUE
audit_trail                          string      NONE
SQL> alter system set audit_trail=DB scope=spfile;
System altered.
SQL> startup force
ORACLE instance started.
Database mounted.
Database opened.
SQL> show parameter audit_trail
NAME                                 TYPE        VALUE
audit_trail                          string      DB
SQL> alter system reset audit_trail scope=spfile sid='*';
System altered.
SQL> startup force
ORACLE instance started.
Database mounted.
Database opened.
SQL> show parameter audit_trail
NAME                                 TYPE        VALUE
audit_trail                          string      NONEThe fact that it will write the spfile is not 'Dangerous' as someone previously declared, it must delete entries from the spfile if required so the parameter takes its default value at startup.
In case the parameter is not found at the spfile, an error will be displayed:
SQL> alter system reset service_names  sid='orcl';
alter system reset service_names  sid='orcl'
ERROR at line 1:
ORA-32010: cannot find entry to delete in SPFILEThe sid is a required parameter when resetting an spfile parameter.
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