|Oracle® Database SQL Reference
10g Release 1 (10.1)
Part Number B10759-01
When a user logs on, Oracle Database enables all privileges granted explicitly to the user and all privileges in the user's default roles. During the session, the user or an application can use the
ROLE statement any number of times to change the roles currently enabled for the session.
You must already have been granted the roles that you name in the
Specify a role to be enabled for the current session. Any roles not listed and not already enabled are disabled for the current session.
You cannot specify a role unless it was granted to you either directly or through other roles.
Roles listed in the
EXCEPT clause must be roles granted directly to you. They cannot be roles granted to you through other roles.
If you list a role in the
EXCEPT clause that has been granted to you both directly and through another role, then the role remains enabled by virtue of the role to which it has been granted.
You cannot use this clause to enable roles with passwords that have been granted directly to you.
NONE to disable all roles for the current session, including the
To enable the role
dw_manager identified by the password
warehouse for your current session, issue the following statement:
SET ROLE dw_manager IDENTIFIED BY warehouse;
To enable all roles granted to you for the current session, issue the following statement:
SET ROLE ALL;
To enable all roles granted to you except
dw_manager, issue the following statement:
SET ROLE ALL EXCEPT dw_manager;
To disable all roles granted to you for the current session, issue the following statement:
SET ROLE NONE;