由于节点2的redo出问题，导致节点2实例不能mount。

由于节点2的redo出问题，导致节点2实例不能mount。

SQL> alter database mount;

alter database mount

*

ERROR at line 1:

ORA-01618: redo thread 2 is not enabled - cannot mount

错误说明：

[oracle@rac2 bin]$ oerr ora 01618

01618, 00000, "redo thread %s is not enabled - cannot mount"

// *Cause:  The INIT.ORA parameter "thread" requests a thread that is not

//          enabled. A thread must be enabled before it can be mounted.

// *Action: Shutdown the instance, change the INIT.ORA parameter and startup

//          mounting a different thread. If the database is open in another

//          instance then the thread may be enabled.

解决方法：

在另一个能打开的节点执行

SQL> alter database add logfile thread 2 ('+DATA1') size .....;

Database altered.

SQL> alter database add logfile thread 2 ('+DATA1') size .....;

Database altered.

SQL> alter database enable thread 2;

Database altered.

然后打开节点2

SQL> alter database mount;

Database altered.

SQL> alter database open;

Database altered.