129. A database user SMITH tries to query the V$SESSION view and fails to access it as follows:
SQL> connect smith/smith
Connected.
SQL> SELECT * FROM v$session;SELECT * FROM v$session
*
ERROR at line 1:
ORA-00942: table or view does not exist
Which are the two possible solutions to enable SMITH to query the data in V$SESSION? (Choose two.)
A.granting SELECT privilege to SMITH on V$SESSION
B.granting SELECT privilege to SMITH on V_$SESSION
C.asking the user SMITH to run the catalog.sql script
D.granting SELECT privilege to SMITH on V$FIXED_TABLES
E.setting the O7_DICTIONARY_ACCESSIBILITY parameter to TRUE
F.creating a view based on V$SESSION and granting SELECT privilege to SMITH on the view that was
created
Answer: BF
答案解析：
The V$SESSION data dictionary view also contains session information from
the SYS.V_$SESSION system table for the current session
从题中错误看出，SMITH 用户没有访问数据字典v$session的权限，两种解决方法，一是给他访问v$session的权限，二是在v$session建立视图，并授权让SMITH 可以查看
实验第一种方法如下：
sys@TEST1107> create user abc identified by abc;
User created.
sys@TEST1107> grant connect to abc;
Grant succeeded.
sys@TEST1107> conn abc/abc
Connected.
abc@TEST1107> select * from v$session;
select * from v$session
*
ERROR at line 1:
ORA-00942: table or view does not exist
abc@TEST1107> conn /as sysdba
Connected.
sys@TEST1107> grant select on v$session to abc;
grant select on v$session to abc
*
ERROR at line 1:
ORA-02030: can only select from fixed tables/views
sys@TEST1107> grant select on v_$session to abc;
Grant succeeded.
sys@TEST1107> conn abc/abc
Connected.
abc@TEST1107> select count(*) from v$session;
COUNT(*)
----------
43
此处需注意，给的是select on v_$session而不是select on v$session权限。