This section describes aspects of managing roles, and includes the following topics:
A ROLE groups several PRIVILEGES AND ROLES, so that they can be granted and revoked simultaneously from users. Roles can be enabled and disabled per user.
You can create a role using either the sql command create role, or the create role property sheet of enterprise manager.
You must have the create role system privilege to create a role. Typically, only security administrators have this system privilege.
The following statement creates the clerk role, which is authorized by the database using the password bicentennial:
Create role clerk
Identified by bicentennial;
You must give each role you create a unique name among existing usernames and role names of the database. Roles are not contained in the schema of any user.
The roles listed in table are automatically defined for oracle databases. These roles are provided for backward compatibility to earlier versions of oracle. You can grant and revoke privileges and roles to these predefined roles, much the way you do with any role you define.
|Role name||Privileges granted to role|
|Connect 1||Alter session, create cluster, create database link, create sequence, create session, create synonym, create table, create view|
|Create type 7||Create type, execute, execute any type, admin option, grant option|
|Resource 1,2||Create cluster, create procedure, create sequence, create table, create trigger|
|Dba 1,3, 4||All system privileges with admin option|
|Exp_full_database 5||Select any table, backup any table, insert, delete, and update on the tables sys.incvid, sys.incfil, and sys.incexp|
|Imp_full_database 5||Become user|
|Delete_catalog_role 6||Delete privileges on all dictionary packages for this role.|
|Execute_catalog_role||Execute privilege on all dictionary packages for this role.|
|Select_catalog_role 6||Select privilege on all catalog tables and views for this role.|
1. created by sql.bsq.
2. grantees of the resource role also receive the unlimited tablespace system privilege as an explicitly grant (not as part of the resource role).
3. grantees of the dba role also receive the unlimited tablespace system privilege with the admin option as an explicit grant (not as part of the dba role). Therefore when the dba role is revoked, any explicit grant of unlimited tablespace is also revoked.
4. also includes the exp_full_database and imp_full_database roles if catexp.sql has been run.
5. created by catexp.sql.
6. these roles must be granted to users who do not have the dba role, but require access to the views and tables in the data dictionary.
7. the create type command is only available if the oracle objects option is installed on your database server.
Role authorization by the database:
The use of a role can be protected by an associated password. If you are granted a role protected by a password, you can enable or disable the role only by supplying the proper password for the role in a set role command.
Role authorization by the operating system:
The following statement creates a role named accts_rec and requires that the operating system must authorize its use:
Sql>create role role identified externally;
Changing a role’s authorization:
You can set and change the authorization method for a role using either the alter role property sheet of enterprise manager/GUI or the sql command alter role.
The following statement alters the clerk role to be authorized externally:
Sql>alter role clerk identified externally;
Changing a user’s default roles:
A user’s list of default roles can be set and altered using either the alter user dialog box of enterprise manager or the sql command alter user.
Using the all keyword:
If the user’s list of default roles is specified as all, every role granted to a user is automatically added to the user’s list of default roles. Only subsequent modification of a user’s default role list can remove newly granted roles from a user’s list of default roles.
The following statement drops the role clerk:
Sql>drop role clerk;
Technical Content Writer