PING[ARC5]: Heartbeat failed to connect to standby 'dghq'. Error is 12154.

在dataguard搭建之后，主库报错：

Tue Jul 31 15:57:11 2018Error 12154 received logging on to the standbyPING[ARC5]: Heartbeat failed to connect to standby 'dghq'. Error is 12154.

tnsping dghq是ok的。

检查lns进程不存在

SQL>  select process, status, thread#,sequence#, block#, blocks from v$managed_standby;PROCESS    STATUS       THREAD#SEQUENCE#     BLOCK# BLOCKS------------------ ------------------------ ---------- ---------- ---------- ----------ARCH   CONNECTED     00   0      0ARCH   CLOSING     1       154096    666ARCH   CONNECTED     00   0      0ARCH   CLOSING     1       17   1    400ARCH   CLOSING     1       17   1    400ARCH   CLOSING     1       14   1  24896ARCH   CONNECTED     00   0      0ARCH   CONNECTED     00   0      0ARCH   CONNECTED     00   0      0ARCH   CONNECTED     00   0      0最后我修改了/etc/hosts后问题解决了--前两行内容注释掉，最后把备库的ip和别名也写到文件里，重启os。[oracle@oraclerac1 ~]$ more /etc/hosts#127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4#::1         localhost localhost.localdomain localhost6 localhost6.localdomain6192.168.10.180 oraclerac1192.168.10.181 oraclerac2