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.
Restriction on Setting Roles You cannot specify a role unless it was granted to you either directly or through other roles. You cannot specify a role identified globally. Global roles are enabled by default at login, and cannot be reenabled later.
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.
NONE to disable all roles for the current session, including the
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;