目录

启动关闭数据库归档ARCHIVELOG模式

目录

启动/关闭数据库归档(ARCHIVELOG)模式

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。

从Oracle10g开始,log_archive_start参数已经废除