User has no SELECT privilege on V$SESSION（执行计划相关）
开启执行计划的时候，提示如下信息：User has no SELECT privilege on V$SESSION
SCOTT@ orcl>select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- User has no SELECT privilege on V$SESSION起因：因为权限不够
查询官方文档：PL/SQL Packages and Types Reference 中提示要为V$SQL_PLAN, V$SESSION,V$SQL_PLAN_STATISTICS_ALL赋予select权限。
Security Model
This package runs with the privileges of the calling user, not the package owner (SYS). The table function DISPLAY_CURSOR requires to have select privileges on the following fixed views: V$SQL_PLAN, V$SESSION and V$SQL_PLAN_STATISTICS_ALL.
解决方案：
1.登陆SYS用户，将权限赋予SCOTT用户，切换到SCOTT用户
SYS@ orcl>grant select on v_$sql_plan to scott; Grant succeeded. SYS@ orcl>grant select on v_$session to scott; Grant succeeded. SYS@ orcl>grant select on v_$sql_plan_statistics_all to scott; Grant succeeded. SYS@ orcl>conn scott/tiger Connected.<strong> </strong>2.再次查询执行计划，发现可以正常显示了。但存在告警信息，需要将statistics_level改成all。
SCOTT@ orcl>select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID 9z4ytb42f97nh, child number 1
-------------------------------------
WARNING: User has no SELECT privileges on V$SQL
Plan hash value: 1838229974
-----------------------------------------------------------------------
| Id | Operation | Name | E-Rows | OMem | 1Mem | Used-Mem |
-----------------------------------------------------------------------
|* 1 | HASH JOIN | | 100 | 741K| 741K| 1156K (0)|
| 2 | TABLE ACCESS FULL| T1 | 100 | | | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
| 3 | TABLE ACCESS FULL| T2 | 102K| | | |
-----------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("T1"."ID"="T2"."T1_ID")
Note
-----
- dynamic sampling used for this statement
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
- Warning: basic plan statistics not available. These are only collected when
:
* hint 'gather_plan_statistics' is used for the statement or
* parameter 'statistics_level' is set to 'ALL', at session or system leve
l
26 rows selected.
3.将
statistics_level改成all之后，出现了新的告警信息（User has no SELECT privileges on V$SQL）
SCOTT@ orcl>alter session set statistics_level=all;
Session altered.
SCOTT@ orcl>select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID 8vkk4y904h50f, child number 1
WARNING: User has no SELECT privileges on V$SQL
NOTE: cannot fetch plan for SQL_ID: 8vkk4y904h50f, CHILD_NUMBER: 1
Please verify value of SQL_ID and CHILD_NUMBER;
It could also be that the plan is no longer in cursor cache (check v$sql_p
lan)4.继续查询官方文档中
DISPLAY_CURSOR Function 的说明，需要额外为SCOTT赋予
V$SQL的select权限。
Usage Notes
To use the DISPLAY_CURSOR functionality, the calling user must have SELECT privilege on the fixed views V$SQL_PLAN_STATISTICS_ALL, V$SQL and V$SQL_PLAN, otherwise it will show an appropriate error message.
SYS@ orcl>grant select on v_$sql to scott; Grant succeeded.
5.再次查询执行计划，问题解决。没有任何告警值了。
SCOTT@ orcl>select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID 9z4ytb42f97nh, child number 0
-------------------------------------
SELECT /*+leadiing(t1) use_hash(t2) */* FROM t1,t2 WHERE t1.id=t2.t1_id
Plan hash value: 1838229974
----------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |
----------------------------------------------------------------------------------------------------------------
|* 1 | HASH JOIN | | 1 | 100 | 100 |00:00:00.92 | 1019 | 741K| 741K| 1141K (0)|
| 2 | TABLE ACCESS FULL| T1 | 1 | 100 | 100 |00:00:00.01 | 7 | | | |
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 3 | TABLE ACCESS FULL| T2 | 1 | 102K| 100K|00:00:00.30 | 1012 | | | |
----------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("T1"."ID"="T2"."T1_ID")
Note
-----
- dynamic sampling used for this statement
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
23 rows selected.