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转自:http://www.eygle.com/archives/2004/10/oracle_howtoeci.html
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. |
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. |
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 |
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 |
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。
(转)如何启动或关闭数据库的归档(ARCHIVELOG)模式
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原文地址:http://www.cnblogs.com/storymedia/p/4538650.html