以下的文章主要讲述的是正确的启动或是关闭Oracle归档模式的实际操作步骤，我们大家都知道Oracle数据库运行于2种模式，主要实施Oracle归档模式(archivelog)与非归档模式(noarchivelog)。
Oracle归档模式可以提高Oracle数据库的可恢复性，生产数据库都应该运行在此模式下，归档模式应该和相应的备份策略相结合，只有归档模式没有相应的备份策略只会带来麻烦。
本文简单介绍如何启用和关闭数据库的Oracle归档模式。
1.shutdown normal或shutdown immediate关闭数据库
1.oracle@jumper oracle]$ sqlplus "/ as sysdba"
2.SQL*Plus: Release 9.2.0.4.0 - Production on Sat Oct 15 15:48:36 2005
3.Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
4.Connected to:
5.Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
6.With the Partitioning option
7.JServer Release 9.2.0.4.0 - Production
8.SQL> shutdown immediate;
9.Database closed.
10.Database dismounted.
11.ORACLE instance shut down.
2.启动数据库到mount状态
1.SQL> startup mount;
2.ORACLE instance started.
3.Total System Global Area 101782828 bytes
4.Fixed Size 451884 bytes
5.Variable Size 37748736 bytes
6.Database Buffers 62914560 bytes
7.Redo Buffers 667648 bytes
8.Database mounted.
