ORA-12318: database (link name string) is already mounted

文档解释

ORA-12318: database (link name string) is already mounted

Cause: You are attempting to mount a secondary database that has already been mounted by your instance.

Action: to mount it. To establish access, use the ALTER DATABASE OPEN command to open the database.

ORA-12318 错误表示该数据库已经被挂载。

官方解释

常见案例

正常处理方法及步骤

1.使用ALTER DATABASE DISMOUNT命令取消挂载数据库；

2.检查当前数据库是否在挂载状态，使用SQL> SELECT * FROM V$DATABASE;命令；

3.如果当前数据库不在挂载状态，可以使用ALTER DATABASE MOUNT命令挂载数据库。