login.sql注释autotrace以及退格修改

1.login.sql释义 

ThomasKyte的login.sql设置如下

define _editor=vim    --设置sqlplus 默认编辑器
set serveroutput on size 1000000  --打开dbms-out 设置缓冲区尽量大
set trimspool on    --设置脱机输出文本时,取出文本行两端的空格而且行宽不定
set long 5000   --设置选择LONG和colb列时默认字节数
set linesize 150  --设置sqlplus默认显示文本行宽为150字符
set pagesize 9999  --设置sqlplus多久打印一次标题,尽量大,以便每页答应一个标题
column plan_plus_exp format a80 --设置由autotrace得到的解释计划输出宽度.a80可以显示整个计划
column global_name new_value gname
set termout off
define gname=idle
column global_name new_value gname
select lower(user) || '@' || substr( global_name, 1,
decode( dot, 0, length(global_name), dot-1) ) global_name
from (select global_name, instr(global_name,'.') dot from global_name );
set sqlprompt '&gname>'
set termout on

 

define gname=idle 

column global_name new_value gname 

select lower(user) || '@' || substr( global_name, 1,

decode( dot, 0, length(global_name), dot-1) ) global_name

from (select global_name, instr(global_name,'.') dot from global_name );

column global_name new_value gname  告诉sqlplus取得一个新的global_name列的最后一个值,并且将值赋给gname,然后选出global_name,并且与登录名相连接

这样得到的sqlplus提示符如下

 

[oracle@stark ~]$ sqlplus scott/***

SQL*Plus: Release 10.2.0.4.0 - Production on Thu Jul 12 23:27:06 2012

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

scott@STARK>

 2.autotrace释义

autotrace是sqlplus的一个工具可以现实执行计划(explain plan)以及所用的资源,对于以后的工作有很大的作用,autotrace的配置方式不止一种.一下是比较流行的一种.

以sys登录数据库,执行$ORACLE_HOME/rdbms/admin下面的utlxplan

sys@STARK>@/oracle/10.2/rdbms/admin/utlxplan.sql ;

Table created.

之后授权执行以下语句

 

 

sys@STARK>grant all on PLAN_TABLE  to sys;

Grant succeeded.

如果想要所有用户都可以使用autotrace只需要将username更改为public就可以

以后只要执行sqldml语句(select,delete,update,megre,inster)就会生成报告.

他对于监视和调优这些语句很有帮助.

控制报告

set autotrace off     --不生成报告，默认

set autotrace on     --生成执行报告，包括执行路径和统计信息，同时返回执行结果

set autotrace on explain     --只显示执行路径

set autotrace on statistics     --只显示统计信息

set autotrace traceonly     --与set autotrace on的区别是不显示执行结果

 

 eg

 

sys@STARK>set autotrace off;
sys@STARK>select count(*) from tab;

  COUNT(*)
----------
      3670

sys@STARK>set autotrace on;
sys@STARK>select count(*) from tab;

  COUNT(*)
----------
      3670


Execution Plan
----------------------------------------------------------
Plan hash value: 3662916347

---------------------------------------------------------------------------------
| Id  | Operation              | Name   | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------------
|   0 | SELECT STATEMENT       |        |     1 |    77 |   119   (1)| 00:00:02 |
|   1 |  SORT AGGREGATE        |        |     1 |    77 |            |          |
|   2 |   NESTED LOOPS OUTER   |        |   997 | 76769 |   119   (1)| 00:00:02 |
|*  3 |    TABLE ACCESS FULL   | OBJ$   |   997 | 72781 |    32   (4)| 00:00:01 |
|   4 |    TABLE ACCESS CLUSTER| TAB$   |     1 |     4 |     1   (0)| 00:00:01 |
|*  5 |     INDEX UNIQUE SCAN  | I_OBJ# |     1 |       |     0   (0)| 00:00:01 |
---------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   3 - filter("O"."TYPE#"<=5 AND "O"."OWNER#"=USERENV('SCHEMAID') AND
              "O"."TYPE#">=2 AND "O"."LINKNAME" IS NULL)
   5 - access("O"."OBJ#"="T"."OBJ#"(+))


Statistics
----------------------------------------------------------
          0  recursive calls
          0  db block gets
       8382  consistent gets
          0  physical reads
          0  redo size
        516  bytes sent via SQL*Net to client
        492  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed
sys@STARK>select count(*) from tab;

  COUNT(*)
----------
      3670


Execution Plan
----------------------------------------------------------
Plan hash value: 3662916347

---------------------------------------------------------------------------------
| Id  | Operation              | Name   | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------------
|   0 | SELECT STATEMENT       |        |     1 |    77 |   119   (1)| 00:00:02 |
|   1 |  SORT AGGREGATE        |        |     1 |    77 |            |          |
|   2 |   NESTED LOOPS OUTER   |        |   997 | 76769 |   119   (1)| 00:00:02 |
|*  3 |    TABLE ACCESS FULL   | OBJ$   |   997 | 72781 |    32   (4)| 00:00:01 |
|   4 |    TABLE ACCESS CLUSTER| TAB$   |     1 |     4 |     1   (0)| 00:00:01 |
|*  5 |     INDEX UNIQUE SCAN  | I_OBJ# |     1 |       |     0   (0)| 00:00:01 |
---------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   3 - filter("O"."TYPE#"<=5 AND "O"."OWNER#"=USERENV('SCHEMAID') AND
              "O"."TYPE#">=2 AND "O"."LINKNAME" IS NULL)
   5 - access("O"."OBJ#"="T"."OBJ#"(+))

sys@STARK>select count(*) from tab;

  COUNT(*)
----------
      3670


Statistics
----------------------------------------------------------
          0  recursive calls
          0  db block gets
       8382  consistent gets
          0  physical reads
          0  redo size
        516  bytes sent via SQL*Net to client
        492  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed
sys@STARK>set autotrace traceonly
sys@STARK>select count(*) from tab;


Execution Plan
----------------------------------------------------------
Plan hash value: 3662916347

---------------------------------------------------------------------------------
| Id  | Operation              | Name   | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------------
|   0 | SELECT STATEMENT       |        |     1 |    77 |   119   (1)| 00:00:02 |
|   1 |  SORT AGGREGATE        |        |     1 |    77 |            |          |
|   2 |   NESTED LOOPS OUTER   |        |   997 | 76769 |   119   (1)| 00:00:02 |
|*  3 |    TABLE ACCESS FULL   | OBJ$   |   997 | 72781 |    32   (4)| 00:00:01 |
|   4 |    TABLE ACCESS CLUSTER| TAB$   |     1 |     4 |     1   (0)| 00:00:01 |
|*  5 |     INDEX UNIQUE SCAN  | I_OBJ# |     1 |       |     0   (0)| 00:00:01 |
---------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   3 - filter("O"."TYPE#"<=5 AND "O"."OWNER#"=USERENV('SCHEMAID') AND
              "O"."TYPE#">=2 AND "O"."LINKNAME" IS NULL)
   5 - access("O"."OBJ#"="T"."OBJ#"(+))


Statistics
----------------------------------------------------------
          0  recursive calls
          0  db block gets
       8382  consistent gets
          0  physical reads
          0  redo size
        516  bytes sent via SQL*Net to client
        492  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed

 设定退格

 

 

设定环境变量：

 

1）在bash下，把 stty erase ^H 添加到.bash_profile中

 

2）在csh下，把 stty erase ^H 添加到.cshrc中

 

下面是我今天的实现方法（在bash下）

 

[root@testdb ~]# su - oracle   进入oracle主目录，里面有 .bash_profile

[root@testdb ~]# vi .bash_profile 添加一行

 

stty erase ^H

 

:wq 保存退出

 

重新用oracle登录则可。

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