Oracle11G下，如何从归档模式切换到非归档模式

1、第一步，查看当前归档模式状态

SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     25
Next log sequence to archive   27
Current log sequence           27

2、第二步，将数据库关闭后，然后再置于mount状态

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

Total System Global Area  417546240 bytes
Fixed Size                  2213936 bytes
Variable Size             268437456 bytes
Database Buffers          138412032 bytes
Redo Buffers                8482816 bytes
Database mounted.

3、第三步，将数据库修改为非归档模式状态

SQL> alter database noarchivelog;

Database altered.

4、第四步，将数据库置于open状态

SQL> alter database open;

Database altered.

5、第五步，查看归档模式状态

SQL> archive log list;
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     25
Current log sequence           27