做dataguard，备库RMAN同步后alter database open read only发现起不来。rman过程并没有报错，启动备库的时候看alter.log有一堆E sql> alter database open read only;alter database open read only*error at line 1:ora-10458: standby database requires recovery ora-01152: file 1 was not restored from a sufficiently old backup ora-01110: data file 1: '/oracle/oradata/bstyle/system.309.766573511'alter.log有报错Error 12154 received logging on to the standby
发生背景：
做dataguard，备库RMAN同步后alter database open read only发现起不来。rman过程并没有报错，启动备库的时候看alter.log有一堆Error 12154 received logging on to the standby，再看主库alter.log，，也有一堆Error 12154 received logging on to the standby这说明什么呢，说明archivelog归档到备库的路径是失败的，归档不成功！但是主库sqlplus连备库，或备库连接主库都是正常的！为什么归档不行呢？
SQL> select error from v$archive_dest;ERROR-----------------------------------------------------------------ORA-12154: TNS:could not resolve the connect identifier specified I could tnsping the STANDBY from production Dataguard中archive_dest_2是用来指向备库的，负责将归档日志传到备库，检查配置参数注意dest_2中service=这里应该和tnsnames中定义备库的是一样的，如下图。
我这里就是因为设置的不一样导致归档传出过去。改成一样的后一切OK!!!相关参考:Oracle Data Guard 重要配置参数基于同一主机配置 Oracle 11g Data Guard探索Oracle之11g DataGuard Oracle Data Guard （RAC+DG) 归档删除策略及脚本Oracle Data Guard 的角色转换Oracle Data Guard的日志FAL gap问题Oracle 11g Data Guard Error 16143 Heartbeat failed to connect to standby 处理方法