sqlplus autotrace

出自eygle http://www.eygle.com/faq/AutoTrace.htm

D:\oracle\ora92>sqlplus /nolog

SQL*Plus: Release 9.2.0.1.0 - Production on 星期二 6月 3 15:16:03 2003

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

SQL> connect sys as sysdba
请输入口令:
已连接。
SQL> @?\rdbms\admin\utlxplan

表已创建。

SQL> create public synonym plan_table for plan_table;

同义词已创建。

SQL> grant all on plan_table to public ;

授权成功。

SQL> @?\sqlplus\admin\plustrce
SQL>
SQL> drop role plustrace;
drop role plustrace
*
ERROR 位于第 1 行:
ORA-01919: 角色'PLUSTRACE'不存在

SQL> create role plustrace;

角色已创建
SQL>
SQL> grant select on v_$sesstat to plustrace;

授权成功。

SQL> grant select on v_$statname to plustrace;

授权成功。

SQL> grant select on v_$session to plustrace;

授权成功。

SQL> grant plustrace to dba with admin option;

授权成功。

SQL>
SQL> set echo off

 

 

DBA用户首先被授予了plustrace角色,然后我们可以把plustrace授予public

这样所有用户都将拥有plustrace角色的权限.

 

SQL> grant plustrace to public ; 授权成功。

然后我们就可以使用AutoTrace的功能了.

 

SQL> connect eqsp/eqsp 已连接。 SQL> set autotrace on SQL> set timing on SQL>

 

关于Autotrace几个常用选项的说明:

SET AUTOTRACE OFF ---------------- 不生成AUTOTRACE 报告，这是缺省模式
SET AUTOTRACE ON EXPLAIN ------ AUTOTRACE只显示优化器执行路径报告
SET AUTOTRACE ON STATISTICS -- 只显示执行统计信息
SET AUTOTRACE ON ----------------- 包含执行计划和统计信息
SET AUTOTRACE TRACEONLY ------ 同set autotrace on，但是不显示查询输出

 

SQL> set autotrace traceonly
SQL> select table_name from user_tables;

已选择98行。

已用时间: 00: 00: 00.04

Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 NESTED LOOPS
2 1 NESTED LOOPS (OUTER)
3 2 NESTED LOOPS (OUTER)
4 3 NESTED LOOPS (OUTER)
5 4 NESTED LOOPS (OUTER)
6 5 NESTED LOOPS
7 6 TABLE ACCESS (BY INDEX ROWID) OF 'OBJ$'
8 7 INDEX (RANGE SCAN) OF 'I_OBJ2' (UNIQUE)
9 6 TABLE ACCESS (CLUSTER) OF 'TAB$'
10 9 INDEX (UNIQUE SCAN) OF 'I_OBJ#' (NON-UNIQUE)
11 5 TABLE ACCESS (BY INDEX ROWID) OF 'OBJ$'
12 11 INDEX (UNIQUE SCAN) OF 'I_OBJ1' (UNIQUE)
13 4 INDEX (UNIQUE SCAN) OF 'I_OBJ1' (UNIQUE)
14 3 TABLE ACCESS (CLUSTER) OF 'USER$'
15 14 INDEX (UNIQUE SCAN) OF 'I_USER#' (NON-UNIQUE)
16 2 TABLE ACCESS (CLUSTER) OF 'SEG$'
17 16 INDEX (UNIQUE SCAN) OF 'I_FILE#_BLOCK#' (NON-UNIQUE)
18 1 TABLE ACCESS (CLUSTER) OF 'TS$'
19 18 INDEX (UNIQUE SCAN) OF 'I_TS#' (NON-UNIQUE)

 

Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
1389 consistent gets
0 physical reads
0 redo size
2528 bytes sent via SQL*Net to client
569 bytes received via SQL*Net from client
8 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
98 rows processed

SQL>