set autotrace on时候为什么会报Cannot SET AUTOTRACE
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发布时间:2022-04-20 05:08
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时间:2022-05-03 13:27
一、问题描述:
今天想看一下SQL的执行计划,在PL/SQL的command窗口中输入set autotrace on时,报Cannot SET AUTOTRACE的错误。
二、解决办法:
这个命令必须在sql*plus中运行,在PL/SQL中会报错:
Microsoft Windows [版本 6.1.7601]
版权所有 (c) 2009 Microsoft Corporation。保留所有权利。
C:\Users\Administrator>sqlplus scott/tiger
SQL*Plus: Release 11.2.0.3.0 Proction on 星期三 11月 20 11:16:52 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
连接到:
Personal Oracle Database 11g Release 11.2.0.3.0 - 64bit Proction
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> set autotrace on;
SQL> select * from emp;
三、分析:
在网搜解决方法时,发现即使在sql*plus中也有可能出现这个问题,虽然没有遇到,但是将这种情况下的解决方法先记下来备用:
1.首先必须采用用Oracle的sqlplus登陆sys账号
sqlplus " sys/sys@XXX as sysdba "
2.然后执行如下脚本:
(1)plustrce.sql (创建plustrace角色并授权) 脚本内容如下:
-------------------
set echo on
drop role plustrace;
create role plustrace;
grant select on v_$sesstat to plustrace;
grant select on v_$statname to plustrace;
grant select on v_$mystat to plustrace;
grant plustrace to dba with admin option;
set echo off
-------------------
(2)utlxplan.sql (创建执行计划的表)脚本内容如下:
--------------------
create table PLAN_TABLE (
statement_id varchar2(30),
plan_id number,
timestamp date,
remarks varchar2(4000),
operation varchar2(30),
options varchar2(255),
object_node varchar2(128),
object_owner varchar2(30),
object_name varchar2(30),
object_alias varchar2(65),
object_instance numeric,
object_type varchar2(30),
optimizer varchar2(255),
search_columns number,
id numeric,
parent_id numeric,
depth numeric,
position numeric,
cost numeric,
cardinality numeric,
bytes numeric,
other_tag varchar2(255),
partition_start varchar2(255),
partition_stop varchar2(255),
partition_id numeric,
other long,
distribution varchar2(30),
cpu_cost numeric,
io_cost numeric,
temp_space numeric,
access_predicates varchar2(4000),
filter_predicates varchar2(4000),
projection varchar2(4000),
time numeric,
qblock_name varchar2(30),
other_xml clob
);
--------------------
3.然后将该角色和对表的操作权限赋给用户
grant all on plan_table to scott;
grant plustrace to scott;