????3????????仯
???????????????????????仯??????????????????????
????SQL> create role testrole ;
????Role created
????SQL> grant select on sics.cnu_environment to testrole;
????Grant succeeded
????SQL> grant testrole to test;
????Grant succeeded
???????????testrole???????default role??
????SQL> select * from dba_role_privs where GRANTEE='TEST';
????GRANTEE                        GRANTED_ROLE                   ADMIN_OPTION DEFAULT_ROLE
????------------------------------ ------------------------------ ------------ ------------
????TEST                           RESOURCE                       NO           YES
????TEST                           SICSPCCGROLE                   NO           YES
????TEST                           SICSPCTBTRROLE                 NO           YES
????TEST                           TESTROLE                       NO           YES
????TEST                           CONNECT                        NO           YES
????TEST                           SICSPCTBCGROLE                 NO           YES
????TEST                           SICSPCTRROLE                   NO           YES
????7 rows selected
????Testrole??????仯??
????SQL> grant select on scott.emp to testrole;
????Grant succeeded
???????????????б仯??
????SQL> select * from dba_role_privs where GRANTEE='TEST';
????GRANTEE                        GRANTED_ROLE                   ADMIN_OPTION DEFAULT_ROLE
????------------------------------ ------------------------------ ------------ ------------
????TEST                           RESOURCE                       NO           YES
????TEST                           SICSPCCGROLE                   NO           YES
????TEST                           SICSPCTBTRROLE                 NO           YES
????TEST                           TESTROLE                       NO           YES
????TEST                           CONNECT                        NO           YES
????TEST                           SICSPCTBCGROLE                 NO           YES
????TEST                           SICSPCTRROLE                   NO           YES
????7 rows selected
?????Щ????????????????????????????仯??????????????????????
????4??Default Role?????Ч?
????Default Role???????????????????????????????Default Role?????????????Щ??Ч??????
????SQL> alter user test default role connect;
????User altered
???????default role???????????test?connect????????????
????SQL> select * from dba_role_privs where GRANTEE='TEST';
????GRANTEE    GRANTED_ROLE                   ADMIN_OPTION DEFAULT_ROLE
????---------- ------------------------------ ------------ ------------
????TEST      RESOURCE                       NO           NO
????TEST      SICSPCCGROLE                   NO           NO
????TEST      SICSPCTBTRROLE                 NO           NO
????TEST      TESTROLE                       NO           NO
????TEST      CONNECT                        NO           YES
????TEST      SICSPCTBCGROLE                 NO           NO
????TEST      SICSPCTRROLE                   NO           NO
????7 rows selected
??????????????????????connect???????test?????????????????????????????????????????????????????????????????