做一名精致的DBA之glogin.sql

对于一个成熟的dba必须要熟悉glogin.sql这个文件，然后利用它，更好的规避一些操作风险。

1、查看glogin.sql内容

<roidb01:orcl:/u01/app/oracle/product/11.2.0/dbhome_1/sqlplus/admin>$more glogin.sql
--
-- Copyright (c) 1988, 2011, Oracle and/or its affiliates. 
-- All rights reserved. 
--
-- NAME       ##文件名
--   glogin.sql
--
-- DESCRIPTION    ##描述
--   SQL*Plus global login "site profile" file
--
--   Add any SQL*Plus commands here that are to be executed when a
--   user starts SQL*Plus, or uses the SQL*Plus CONNECT command.
--
-- USAGE   ##用法
--   This script is automatically run
--

实际上就是登陆数据库可以自动执行的一个脚本，简单可以这样理解。

2、添加内容
以下内容是我们可以添加的，我们根据我们的需要添加。

SQL> define
DEFINE _DATE           = "13-FEB-2018 21:05:01" (CHAR)
DEFINE _CONNECT_IDENTIFIER = "orcl" (CHAR)
DEFINE _USER           = "SYS" (CHAR)
DEFINE _PRIVILEGE      = "AS SYSDBA" (CHAR)
DEFINE _SQLPLUS_RELEASE = "1102000400" (CHAR)
DEFINE _EDITOR         = "ed" (CHAR)
DEFINE _O_VERSION      = "Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options" (CHAR)
DEFINE _O_RELEASE      = "1102000400" (CHAR)
SQL>                  

这里我添加几个常用的，也是我在生产环境上添加的。

set linesize 200 pagesize 50
set sqlprompt "_user'@'_connect_identifier> "
define_editor=vi

添加的文件内容

<roidb01:orcl:/u01/app/oracle/product/11.2.0/dbhome_1/sqlplus/admin>$vi glogin.sql 
--
-- Copyright (c) 1988, 2011, Oracle and/or its affiliates. 
-- All rights reserved. 
--
-- NAME
--   glogin.sql
--
-- DESCRIPTION
--   SQL*Plus global login "site profile" file
--
--   Add any SQL*Plus commands here that are to be executed when a
--   user starts SQL*Plus, or uses the SQL*Plus CONNECT command.
--
-- USAGE
--   This script is automatically run
--
set linesize 132 pagesize 50
set sqlprompt "_user'@'_connect_identifier> "
define_editor=vi

3、大家看一下结果：

<roidb01:orcl:/u01/app/oracle/product/11.2.0/dbhome_1/sqlplus/admin>$sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Feb 13 21:13:40 2018

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

SYS@orcl> 

小结：
当我们管理多套数据库的时候，可能同时登陆到几套数据库，为了防止出现操作失误的情况，建议大家配置一下glogin.sql，可以时刻提示我们在那套数据库上进行操作，对数据库的操作多谨慎都不为过。