User has no SELECT privilege on V$SESSION

     今天是2013-09-20，最近心情一直很差，但是也不能不学习啊，无论怎么样，自己学到 的东西永远都是自己的。加油！
使用dbms_xplan.display_cursor function的时候发现如下错误。
SQL> select * from amy_dept;

DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON

SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------
User has no SELECT privilege on V$SESSION

SQL>
然后查看官网发现这么几句话：
This package runs with the privileges of the calling user, not the package owner (SYS). The table functionDISPLAY_CURSOR requires to have select privileges on the following fixed views:V$SQL_PLAN, V$SESSION and V$SQL_PLAN_STATISTICS_ALL.
也就是说要有，v$sql_plan,v$session,v$sql_plan_statistics_all权限。
如下：
SQL> conn sys/root as sysdba
Connected.
SQL> grant select on v_$sql_plan to rhys;

Grant succeeded.

SQL> grant select on v_$session to rhys;

Grant succeeded.

SQL> grant select on v_$sql_plan_statistics_all to rhys;

Grant succeeded.

SQL> conn rhys/amy
Connected.
SQL> select * from dept;
select * from dept
*
ERROR at line 1:
ORA-00942: table or view does not exist

SQL> select * from amy_dept;

DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON

SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
User has no SELECT privilege on V$SESSION

SQL>

依然出错，咋回事？然后继续看联机手册，又发现了这么一句话：
To use the DISPLAY_CURSOR functionality, the calling user must haveSELECT privilege on the fixed views V$SQL_PLAN_STATISTICS_ALL,V$SQL and V$SQL_PLAN, otherwise it shows an appropriate error message.

呵呵。那么这就明了，要想使用display_cursor那么必须要有对v$sql，v$sql_plan_statistics_all,v$session,v$sql_pan这四个视图的权限。先看看rhys账户有哪些权限吧：
SQL> select
2 substr(grantee,1,20),
3 substr(owner,1,20),
4 substr(table_name,1,20),
5 substr(grantor,1,20),
6 substr(privilege,1,30),
7 substr(grantable,1,20),
8 substr(hierarchy,1,20)
9 from user_tab_privs;

SUBSTR(GRANTEE,1,20) SUBSTR(OWNER,1,20) SUBSTR(TABLE_NAME,1, SUBSTR(GRANTOR,1,20) SUBSTR(PRIVILEGE,1,30) SUB SUB
-------------------- -------------------- -------------------- -------------------- ------------------------------ --- ---
RHYS SYS V_$SESSION SYS SELECT NO NO
RHYS SYS V_$SQL_PLAN SYS SELECT NO NO
RHYS SYS V_$SQL_PLAN_STATISTI SYS SELECT NO NO

SQL>
SQL> conn sys/root as sysdba
Connected.
SQL> grant select on v_$sql to rhys;

Grant succeeded.

SQL> conn rhys/amy
Connected.
SQL> select * from table(dbms_xplan.display_cursor);

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID dyk4dprp70d74, child number 0
-------------------------------------
SELECT DECODE('A','A','1','2') FROM DUAL

Plan hash value: 1388734953

-----------------------------------------------------------------
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
-----------------------------------------------------------------
| 0 | SELECT STATEMENT | | | 2 (100)| |
| 1 | FAST DUAL | | 1 | 2 (0)| 00:00:01 |
-----------------------------------------------------------------

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

13 rows selected.

SQL>