ORA-00750: database has been previously mounted and dismounted

文档解释

ORA-00750: database has been previously mounted and dismounted

Cause: The instance has already mounted and dismounted the database, which is only allowed once in its lifetime.

Action: Shut down the database.

ORA-00750错误提示：“数据库已经被挂载过一次并且又被卸载”，它是oracle错误代码之一。

官方解释

常见案例

正常处理方法及步骤

1. 进入sqlplus登录系统。

2. 使用“shutdown abort”命令关闭数据库，强行终止数据库，这种方式会将当前活动会话杀掉。

3. 使用“startup mount”命令将数据库挂载。

4. 验证是否挂载成功，使用“select open_mode from v$database;”命令能看到open_mode为“MOUNTED”。

5. 使用“alter database open”命令将数据库开启即可。