select any dictionary与select_catalog_role的区别
select any dictionary与select_catalog_role
相同之处,有了这两个中的一个,基本就可以查询数据字典
不同之处:
1、select any dictionary是一种系统权限(system privilege),而select_catalog_role 是一种角色(a role)。
2、角色的话需要重新登录或者显式的set role 来生效,而赋予系统权限是立即生效的。(P.S. 同样revoke权限也是立即生效)
3、select_catalog_role可以查看一些数据字典的视图·(可以看role的定义),如dba_之类的,而select any dictionary可以查看sys的表,select_catalog_role看不到。
下面具体验证一下:
2、角色的话需要重新登录或者显式的set role 来生效,而赋予系统权限是立即生效的。(P.S. 同样revoke权限也是立即生效)
select any dictionary立即生效
同时开两个会话,查看情况。从上至下,按顺序。
sys@test10gr2> select * from dba_role_privs where grantee = 'TEST_USER';
GRANTEE GRANTED_ROLE ADM DEF
------------------------------ ------------------------------ --- ---
TEST_USER CONNECT NO YES
TEST_USER RESOURCE NO YES1、TEST_USER 只有最基本的CONNECT和RESOURCE 角色,其它的表权限也没有。
TEST_USER@test10gr2> select count(*) from v$session;
select count(*) from v$session
*
ERROR at line 1:
ORA-00942: table or view does not exist2、此时看不到 v$session
sys@test10gr2> GRANT SELECT ANY DICTIONARY TO TEST_USER;Grant succeeded.
3、赋予SELECT ANY DICTIONARY系统权限
TEST_USER@test10gr2> select count(*) from v$session;
COUNT(*)
----------
734、立即生效,可以查看到v$session
sys@test10gr2> REVOKE SELECT ANY DICTIONARY FROM TEST_USER;
Revoke succeeded.
5、收回SELECT ANY DICTIONARY系统权限
TEST_USER@test10gr2> select count(*) from v$session;
select count(*) from v$session
*
ERROR at line 1:
ORA-00942: table or view does not exist6、立即生效,无法查看到v$session
select_catalog_role 无法立即生效
sys@test10gr2> GRANT SELECT_CATALOG_ROLE TO TEST_USER;
Grant succeeded.
1、赋予SELECT ANY DICTIONARY角色
TEST_USER@test10gr2> select count(*) from v$session;
select count(*) from v$session
*
ERROR at line 1:
ORA-00942: table or view does not exist2、无法立即生效,使用set role即可,
revoke role也相同,不即时生效。
TEST_USER@test10gr2> set role SELECT_CATALOG_ROLE;Role set.
TEST_USER@test10gr2> select count(*) from v$session;
COUNT(*)
----------
74
3、select_catalog_role可以查看一些数据字典的视图·,如dba_之类的,而select any dictionary可以查看sys的表。
select any dictionary 可以看到 SYS.ACCESS$表
test_user@test10gr2> select * from dba_sys_privs where grantee = 'TEST_USER';
GRANTEE PRIVILEGE ADM
------------------------------ ---------------------------------------- ---
TEST_USER UNLIMITED TABLESPACE NO
TEST_USER SELECT ANY DICTIONARY NO
test_user@test10gr2> select * from dba_role_privs where grantee = 'TEST_USER';GRANTEE GRANTED_ROLE ADM DEF
------------------------------ ------------------------------ --- ---
TEST_USER CONNECT NO YES
TEST_USER RESOURCE NO YES
test_user@test10gr2> desc SYS.ACCESS$
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
D_OBJ# NOT NULL NUMBER
ORDER# NOT NULL NUMBER
COLUMNS RAW(126)
TYPES NOT NULL NUMBER
select_catalog_role 看不到
test_user@test10gr2> select * from dba_sys_privs where grantee = 'TEST_USER';
GRANTEE PRIVILEGE ADM
------------------------------ ---------------------------------------- ---
TEST_USER UNLIMITED TABLESPACE NOtest_user@test10gr2> select * from dba_role_privs where grantee = 'TEST_USER';
GRANTEE GRANTED_ROLE ADM DEF
------------------------------ ------------------------------ --- ---
TEST_USER CONNECT NO YES
TEST_USER RESOURCE NO YES
TEST_USER SELECT_CATALOG_ROLE NO YEStest_user@test10gr2> desc SYS.ACCESS$
ERROR:
ORA-04043: object SYS.ACCESS$ does not exist
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