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
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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。
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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!!!0daybank
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