Clearing (removing) an SPFILE parameter

Question

11.2.0.3/Solaris
I want to clear the value set for LOCAL_LISTENER and set it to null. As per doc, I have to use RESET command. But RESET works only with SCOPE= SPFILE . ie. I have to bounce the DB to bring this change into effect.
SQL> show parameter spfile
NAME                                 TYPE        VALUE
spfile                               string      /u01/app/oracle/product/11.2.0
                                                 /dbhome_1/dbs/spfileorcl.ora
SQL>
SQL> show parameter LOCAL_LISTENER
NAME                                 TYPE        VALUE
local_listener                       string      (DESCRIPTION=(ADDRESS=(PROTOCO
                                                 L=TCP)(HOST=192.168.0.182)(POR
                                                 T=1892)))
SQL>
SQL>
SQL>
SQL> alter system reset LOCAL_LISTENER scope=both;
alter system reset LOCAL_LISTENER scope=both
ERROR at line 1:
ORA-32029: resetting with SCOPE=MEMORY or SCOPE=BOTH is currently not supported
SQL> alter system reset LOCAL_LISTENER ;
System altered.
SQL> show parameter spfile
NAME                                 TYPE        VALUE
spfile                               string      /u01/app/oracle/product/11.2.0
                                                 /dbhome_1/dbs/spfileorcl.ora
SQL>
------ Still showing the old value as a bounce is required
SQL> show parameter LOCAL_LISTENER
NAME                                 TYPE        VALUE
local_listener                       string      (DESCRIPTION=(ADDRESS=(PROTOCO
                                                 L=TCP)(HOST=192.168.0.182)(POR
                                                 T=1892)))Is setting the parameter to empty string supported in Oracle . It seems to have worked for me, But i would like to know if it is recommended.
SQL> show parameter LOCAL_LISTENER
NAME                                 TYPE        VALUE
local_listener                       string      (DESCRIPTION=(ADDRESS=(PROTOCO
                                                 L=TCP)(HOST=192.168.0.182)(POR
                                                 T=1892)))
SQL> alter system set LOCAL_LISTENER = '' scope = both;
System altered.
SQL> show parameter LOCAL_LISTENER
NAME                                 TYPE        VALUE
local_listener                       string
SQL>The below article says it is not recommeded to use empty string. But , what other option do I have to clear a parameter's value without bouncing the DB ?
http://coskan.wordpress.com/2007/03/07/setting-or-resetting-unsetting-parameters/
Edited by: greeny on 12-Nov-2012 06:25

Answer 1

1)
if you want to set local_listener for only this session
ALTER SYSTEM SET LOCAL_LISTENER='' SCOPE=MEMORY;
if you want to make it persistent (need rebound to take effect):
ALTER SYSTEM SET LOCAL_LISTENER='' SCOPE=SPFILE;
if you want use at this session and make persistent when rebound database:
ALTER SYSTEM SET LOCAL_LISTENER='' SCOPE=BOTH;
2)SQL> alter system reset LOCAL_LISTENER scope=both;
alter system reset LOCAL_LISTENER scope=both
ERROR en lÝnea 1:
ORA-32029: actualmente no se soporta el restablecimiento con SCOPE=MEMORY o
SCOPE=BOTH
SQL> alter system set LOCAL_LISTENER='' scope=MEMORY;
Sistema modificado.
SQL> alter system reset LOCAL_LISTENER ;
Sistema modificado.Edited by: Fran on 12-nov-2012 6:43