ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

数据库启动，从nomount状态到mount状态，然后启动归档模式

startup nomount;

alter database mount;

alter database archivelog;

出现错误： ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

实例恢复需要，不能设置为归档模式。因上次未正常关闭数据库所致。

解决办法：

直接打开数据库到open状态，然后shutdown immediate,重新启动即可。

startup mount

alter database archivelog;

alter database open;

SQL> startup nomount;
ORACLE instance started.

Total System Global Area 676433920 bytes
Fixed Size 2216424 bytes
Variable Size 415239704 bytes
Database Buffers 251658240 bytes
Redo Buffers 7319552 bytes
SQL> alter database mount ;

Database altered.

SQL> alter database archivelog;

Database altered.

SQL> alter database open;

Database altered.