Erase (delete) a SPFILE parameter

11.2.0.3/Solaris

I want to clear the value set for LOCAL_LISTENER and set the value to null. According to the doc, I have to use the RESET command. But the RESET works that with SCOPE = SPFILE. That is to say. I have to bounce the DB to bring this amendment into force.
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 the empty string parameter 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 article says it is not recommended to use an empty string. But, what other choice do I have to clear the value of a parameter without bouncing the DB?
http://Coskan.WordPress.com/2007/03/07/setting-or-resetting-unsetting-parameters/

Published by: greeny on November 12, 2012 06:25

It's how erase editable a SPFILE parameter

I usually use the following to do this:

alter system reset  scope=spfile sid='*';

Reference to the alter_system_reset_clause of the SQL language for more information reference:

"This clause allows you to remove the frame, for any instance, any initialization parameter in the spfile which was used to start the instance." etc.

Tags: Database

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