Delete an Option Setting

Omit the option-value to delete the option setting from the database.

If option-value is omitted, the specified option setting is deleted from the database. If option-value is a personal option setting, the value reverts back to the PUBLIC setting. If a TEMPORARY option is deleted, the option setting reverts back to the permanent setting.

For example, reset the ANSINULL option to its default value:

SET OPTION ANSINULL =

If you incorrectly type the name of an option when you are setting the option, the incorrect name is saved in the SYSOPTION table. You can remove the incorrectly typed name from the SYSOPTION table by setting the option PUBLIC with an equality after the option name and no value:

SET OPTION PUBLIC.a_mistyped_name=;

For example, if you set an option and incorrectly type the name, you can verify that the option was saved by selecting from the SYSOPTIONS view:

SET OPTION PUBLIC.a_mistyped_name='ON';
SELECT * FROM SYSOPTIONS ORDER BY 2;

Remove the incorrectly typed option by setting the option to no value, then verify that the option is removed:

SET OPTION PUBLIC.a_mistyped_name=;
SELECT * FROM SYSOPTIONS ORDER BY 2;

If you remove the PUBLIC option and then try to add the USER option, an error message displays:

Couldn't execute the statement.
Invalid option 'chained' -- no PUBLIC setting exists
SQLCODE=-200?ODBC 3 State="42000"
Line 1,Column 29

In order to reset the PUBLIC option to the default value, explicitly set the default value:

SET OPTION PUBLIC.chained ='ON';