Oracle 学习之RMAN（二）由此开始
Recovery Manager(RMAN)是Oracle提供的一个实用工具，使用RMAN可以对Oracle数据库进行备份、还原、恢复等。RMAN还可以自动管理Oracle的备份策略。RMAN提供了命令行与图形界面两种访问方式。我们主要学习命令行方式操作RMAN。进入RMAN非常简单，执行在OS环境下敲入rman命令即可。
# su - oracle
11gdg-> rman
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jul 8 00:30:07 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates.All rights reserved.
RMAN>
我们要使用RMAN对数据库进行备份、恢复等操作，首先需要登录到目标数据库。连接到目标数据库有以下几种方式
[*] 登录本地服务器
11gdg-> rman target /
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jul 8 00:32:36 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates.All rights reserved.
connected to target database: DEVDB (DBID=789087786)
RMAN>
target关键字用来指定目标数据库。如果本地服务器有多个实例，想登录到某个具体实例时，需要先声明环境变量export ORACLE_SID=orcl
[*] 登录远程服务器
要登录远程服务器，必须先提供一个连接字符串，即编辑本地tnsnames.ora文件添加要连接的数据库。
11gdg-> rman target sys/oracle@devdb
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jul 8 00:40:05 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates.All rights reserved.
connected to target database: DEVDB (DBID=789087786)
RMAN>
当然，以上两种方式，也可以使用rman先启动程序，在rman里使用connect连接数据库。
11gdg-> rman
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jul 8 00:42:47 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates.All rights reserved.
RMAN> connect target
connected to target database: DEVDB (DBID=789087786)
RMAN>
或者
11gdg-> rman
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jul 8 00:42:47 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates.All rights reserved.
RMAN> connect target sys/oracle@devdb
connected to target database: DEVDB (DBID=789087786)
RMAN>
退出rman 。 在rman环境下按Ctrl+d，或者输入exit命令。
11gdg-> rman
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jul 8 00:42:47 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates.All rights reserved.
RMAN> connect target sys/oracle@devdb
connected to target database: DEVDB (DBID=789087786)
RMAN> exit
Recovery Manager complete.
11gdg->
rman提供了log参数，可以将rman执行过程中打印的日志重定向到log指定的文件中去。log参数只能在命令行中使用，不能在rman运行环境中使用。
11gdg-> rman target / log=rman.log
RMAN>
11gdg-> cat rman.log
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jul 8 00:47:05 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates.All rights reserved.
connected to target database: DEVDB (DBID=789087786)
11gdg->
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