alter role role_name not identified;

alter role role_name identified by password;

alter role role_name identified externally;

grant priv_name to role_name [WITH ADMIN OPTION];

grant update(column_name1,col_name2,...) on table_name to role_name;

grant role_name1 to role_name2;

/*建立default role,用户登录时，缺省激活default role*/

alter user user_name default role role_name1,role_name2,...;

alter user user_name default role all;

alter user user_name default role all except role_name1,...;

alter user user_name default role none;

set role role1 [identified by password],role2,....;

set role all;

set role except role1,role2,...;

set role none;

revoke role_name from user_name;

revoke role_name from public;

drop role role_name;

select * from dba_roles/dba_role_privs/role_role_privs/dba_sys_privs/role_sys_privs/role_tab_privs/session_roles;

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