Oracle数据库可以运行在2种模式下:归档模式(archivelog)和非归档模式(noarchivelog)
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归档模式。
1.shutdown normal或shutdown immediate关闭数据库
[oracle@jumper oracle]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Sat Oct 15 15:48:36 2005
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
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2.启动数据库到mount状态
SQL> startup mount;
ORACLE instance started.
Total System Global Area 101782828 bytes
Fixed Size 451884 bytes
Variable Size 37748736 bytes
Database Buffers 62914560 bytes
Redo Buffers 667648 bytes
Database mounted.
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3.启用或停止归档模式
如果要启用归档模式，此处使用
alter database archivelog 命令。
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /opt/oracle/oradata/conner/archive
Oldest online log sequence 148
Next log sequence to archive 151
Current log sequence 151
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如果需要停止归档模式，此处使用：
alter database noarchivelog 命令。
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 101782828 bytes
Fixed Size 451884 bytes
Variable Size 37748736 bytes
Database Buffers 62914560 bytes
Redo Buffers 667648 bytes
Database mounted.
SQL> alter database noarchivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Enabled
Archive destination /opt/oracle/oradata/conner/archive
Oldest online log sequence 149
Current log sequence 152
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4.修改相应的初始化参数
Oracle10g之前，你还需要修改初始化参数使数据库处于自动归档模式。
在pfile/spfile中设置如下参数：
log_archive_start = true重启数据库此参数生效，此时数据库处于自动归档模式。
也可以在数据库启动过程中，手工执行：
archive log start
使数据库启用自动归档，但是重启后数据库仍然处于手工归档模式。
从Oracle10g开始，log_archive_start参数已经废除，请参考：.
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