使用dbms_xplan.display_cursor function的时候发现如下错误。
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 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> 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>