修改数据库归档模式

首先查看数据库现有模式可使用以下语句
select name,log_mode from v$database

2.关闭数据库
SQL> shutdown immediate

3.启动数据mount状态：
SQL> startup mount;

4、修改数据库为归档模式：
SQL> alter database archivelog;

5、打开数据库，查询：
SQL> alter database open;

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area 1258291200 bytes
Fixed Size 1978336 bytes
Variable Size 318771232 bytes
Database Buffers 922746880 bytes
Redo Buffers 14794752 bytes
Database mounted.
SQL> alter database archivelog;

Database altered.

SQL> alter database open;

Database altered.