ORA-10458: standby database requires recovery

搭建DG最后一步打开时报错如下：

SQL> alter database open read only;

alter database open read only

ERROR at line 1:

ORA-01152: file 1 was not restored from a sufficiently old backup

ORA-01110: data file 1: '/data/oradata/orcl/system01.dbf'

ORA-16043: Redo apply has been canceled.

ORA-16016: archived log for thread 1 sequence# 61 unavailable

ORA-10877: error signaled in parallel recovery slave

错误原因：少归档。

解决办法：从主库传送归档到备库恢复即可，命令如下：

先 recover managed standby database cancel;

再执行：

RMAN> recover database;