Oracle的AUTOTRACE功能

ORACLE9i在使用autotrace之前,需要作一些初始设置:

1.用sys用户运行脚本utlxplan.sql创建PLAN_TABLE表
脚本目录:(UNIX:$ORACLE_HOME/rdbms/admin, Windows:%ORACLE_HOME%/rdbms/admin)utlxplan.sql。
SQL> connect sys/sys@sys as sysdba;
SQL> @J:/oracle/product/10.2.0/db_1/RDBMS/ADMIN/utlxplan.sql;
SQL> create public synonym plan_table for plan_table; --建立同义词
SQL> grant all on plan_table to public;--授权所有用户
 
2.用sys用户运行脚本plustrce.sql建立一个角色plustrace
脚本目录:(UNIX:$ORACLE_HOME/sqlplus/admin, Windows:%ORACLE_HOME%/sqlplus/admin)plustrce.sql;
SQL> @J:/oracle/product/10.2.0/db_1/sqlplus/admin/plustrce.sql;

3.将角色plustrace授予需要autotrace的用户;
SQL>grant plustrace to public;

plustrce.sql脚本如下
create role plustrace;
grant select on v_$sesstat to plustrace;
grant select on v_$statname to plustrace;
grant select on v_$mystat to plustrace;
grant select on v_$session to plustrace;
grant plustrace to dba with admin option;
 
4.经过以上步骤的设置,就可以在sql*plus中使用autotrace了,使用非常简单,只要在执行语句之前,执行这样一条命令:
SQL>set autotrace on
即可。


*autotrace功能只能在SQL*PLUS里使用

补充:
1.ORA-01039: 视图基本对象的权限不足的解决方法
1). 8i & 9i中的解决办法:-
grant select any table to scott;
2). 9i and 10g
中的解决办法:-
grant select any dictionary to scott;
3). 8i and 9i中,也可显式地把基本表的select权限赋给scott:
grant select on OBJ$ to scott;
grant select on USER$ to scott;
grant select on SEG$ to scott;
grant select on TS$ to scott;
grant select on TAB$ to scott;

2.在SQPPLUS中得到更新成功或者插入成功的记录数
SQL>set feedback 1;
已创建 1 行。

3.在SQPPLUS中得到语句总执行的时间
SQL> set timing on;
已用时间:  00: 00: 00.10

4.AUTOTRACE的几个常用选项
(1)  set autotrace on explain; --只显示执行计划
SQL> set autotrace on explain;
SQL> select count(*) from dept;
  COUNT(*)
----------
         4
执行计划
----------------------------------------------------------
Plan hash value: 2946246213
-----------------------------------------------------------------------------
| Id  | Operation        | Name             | Rows  | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT |                  |     1 |     1   (0)| 00:00:01 |
|   1 |  SORT AGGREGATE  |                  |     1 |            |          |
|   2 |   INDEX FULL SCAN| DEPTNO_DNAME_IND |     4 |     1   (0)| 00:00:01 |
-----------------------------------------------------------------------------
 
(2)  set autotrace traceonly;  --同set autotrace on 只是不显示查询输出
SQL> set autotrace traceonly;
SQL> set feedback
SQL> set timing off;
SQL> select count(*) from dept;
执行计划
----------------------------------------------------------
Plan hash value: 2946246213
-----------------------------------------------------------------------------
| Id  | Operation        | Name             | Rows  | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT |                  |     1 |     1   (0)| 00:00:01 |
|   1 |  SORT AGGREGATE  |                  |     1 |            |          |
|   2 |   INDEX FULL SCAN| DEPTNO_DNAME_IND |     4 |     1   (0)| 00:00:01 |
-----------------------------------------------------------------------------
统计信息
----------------------------------------------------------
          0  recursive calls
          0  db block gets
          1  consistent gets
          0  physical reads
          0  redo size
        408  bytes sent via SQL*Net to client
        385  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed
 
(3)  set autotrace traceonly explain; 
--比较实用的选项,只显示执行计划,但是与set autotrace on explain;相比不会执行语句,对于仅仅查看大表的Explain Plan非常管用。
SQL> set autotrace traceonly explain;
SQL> select count(*) from dept;
执行计划
----------------------------------------------------------
Plan hash value: 2946246213
-----------------------------------------------------------------------------
| Id  | Operation        | Name             | Rows  | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT |                  |     1 |     1   (0)| 00:00:01 |
|   1 |  SORT AGGREGATE  |                  |     1 |            |          |
|   2 |   INDEX FULL SCAN| DEPTNO_DNAME_IND |     4 |     1   (0)| 00:00:01 |
-----------------------------------------------------------------------------

(4)  set autotrace on statistics;--只显示统计信息
SQL> set autotrace on statistics;
SQL> select count(*) from dept;
  COUNT(*)
----------
         4
统计信息
----------------------------------------------------
          0  recursive calls
          0  db block gets
          1  consistent gets
          0  physical reads
          0  redo size
        408  bytes sent via SQL*Net to client
        385  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed

 


 

 

你可能感兴趣的:(oracle)