一、问题描述
使用sqlplus时，连接到业务用户时，想查看某SQL的执行计划，报【SP2-0618: Cannot find the Session Identifier. Check PLUSTRACE role is enabled】和【SP2-0611: Error enabling STATISTICS report】，通过相关文档检索后得知原因是缺少plus trace ROLE的权限，解决思路：赋予用户plustrace 权限即可。
二、操作过程
1.登录用户，打开autotrace功能时报错
[oracle@db2 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Mon Mar 21 09:29:29 2016
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> conn ptpcpuser
Enter password:
Connected.
SQL> set autot on
SP2-0618: Cannot find the Session Identifier. Check PLUSTRACE role is enabled
SP2-0611: Error enabling STATISTICS report
2.给用户赋予plustrace权限，报错【ORA-01919: role 'PLUSTRACE' does not exist】该角色不存在
SQL> conn / as sysdba
Connected.
SQL >grant plustrace to scott;
grant plustrace to scott
ERROR at line 1:
ORA-01919: role 'PLUSTRACE' does not exist
3.安装plustrce包，建立plustrace角色，执行$ORACLE_HOME/sqlplus/admin/plustrce.sql包
SQL >conn / as sysdba
Connected.
SQL >@?/sqlplus/admin/plustrce.sql
SQL >
SQL >drop role plustrace;
drop role plustrace
*
ERROR at line 1:
ORA-01919: role 'PLUSTRACE' does not exist
SQL >create role plustrace;
Role created.
SQL >
SQL >grant select on v_$sesstat to plustrace;
Grant succeeded.
SQL >grant select on v_$statname to plustrace;
Grant succeeded.
SQL >grant select on v_$mystat to plustrace;
Grant succeeded.
SQL >grant plustrace to dba with admin option;
Grant succeeded.
SQL >
SQL >set echo off
SQL >
4.给用户赋予plustrace权限成功
SQL> grant plustrace to ptpcpuser;
Grant succeeded.
5.连接该用户，并且打开autotrace成功
SQL> conn ptpcpuser
Enter password:
Connected.
SQL> set autot trace
SQL> select nvl(SUM(t.bean_count), 0)/100 from bean_record t WHERE t.invest_multip > 1 AND t.status = '2';
Execution Plan
----------------------------------------------------------
Plan hash value: 3322369200
--------------------------------------------------------------------------------
--
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
|
--------------------------------------------------------------------------------
--
| 0 | SELECT STATEMENT | | 1 | 9 | 77835 (1)| 00:15:35
|
| 1 | SORT AGGREGATE | | 1 | 9 | |
|
|* 2 | TABLE ACCESS FULL| BEAN_RECORD | 4591K| 39M| 77835 (1)| 00:15:35
|
--------------------------------------------------------------------------------
--
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("T"."INVEST_MULTIP">1 AND "T"."STATUS"='2')
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
313283 consistent gets
313277 physical reads
0 redo size
549 bytes sent via SQL*Net to client
520 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
三、总结
此问题有两个知识点，（1）是用户缺少set autotrace的权限，（2）是数据库缺少角色plustrace。这个问题对DBA来讲不是什么难事，但是还是要注意权限的管理与回收。继续学习喽，下回见。
