查看是否为归档模式：
SQL> archive log list;
Database log mode No Archive Mode --非归档模式
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 9
Current log sequence 11

Automatic archival Disabled //Disabled表示数据库为非归档模式

修改数据库为归档模式步骤：
1.关闭数据库
2.启动数据库到mount状态
3.修改数据库为归档模式
4.open数据库

1）关闭数据库
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 1653518336 bytes
Fixed Size 2253784 bytes
Variable Size 1006636072 bytes
Database Buffers 637534208 bytes
Redo Buffers 7094272 bytes
Database mounted.

3）修改数据库为归档模式
SQL> alter database archivelog;

Database altered.

4）open数据库
SQL> alter database open;

Database altered.

5）验证
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 9
Next log sequence to archive 11
Current log sequence 11

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oracle 修改数据库为归档模式

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