1、    确定数据库当前以哪种归档模式运行。

以sys用户登录数据库，通过archive log list命令来确认当前数据库是否采用归档模式。

[oracle@localhost ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Sun Mar 24 14:41:21 2013

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production

With the Partitioning, Automatic Storage Management, OLAP, Data Mining

and Real Application Testing options

SQL> archive log list

Database log mode              No Archive Mode

Automatic archival             Disabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     14

Current log sequence           16

2、    关闭数据库

只有在mount状态，才可以更改ARCHIVELOG 模式，因此先关闭数据库。

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

3、    装载数据库

SQL> startup mount

ORACLE instance started.

Total System Global Area  707244032 bytes

Fixed Size                  1338868 bytes

Variable Size             511705612 bytes

Database Buffers          188743680 bytes

Redo Buffers                5455872 bytes

Database mounted.

4、    将数据库更改为使用ARCHIVELOG 模式。

SQL> alter database archivelog;

Database altered.

5、    打开数据库

SQL> alter database open;

Database altered.

6、    验证数据库归档模式修改结果（两种方式均可）

SQL>  select name,log_mode from v$database;

NAME      LOG_MODE

--------- ------------

ORCL      ARCHIVELOG

SQL> archive log list

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     15

Next log sequence to archive   17

Current log sequence           17