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在dataguard搭建之后，主库报错：
Tue Jul 31 15:57:11 2018 Error 12154 received logging on to the standby PING[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$managed_standby; PROCESS STATUS THREAD#SEQUENCE# BLOCK# BLOCKS ------------------ ------------------------ ---------- ---------- ---------- ---------- ARCH CONNECTED 00 0 0 ARCH CLOSING 1 154096 666 ARCH CONNECTED 00 0 0 ARCH CLOSING 1 17 1 400 ARCH CLOSING 1 17 1 400 ARCH CLOSING 1 14 1 24896 ARCH CONNECTED 00 0 0 ARCH CONNECTED 00 0 0 ARCH CONNECTED 00 0 0 ARCH CONNECTED 00 0 0 最后我修改了/etc/hosts后问题解决了--前两行内容注释掉，最后把备库的ip和别名也写到文件里，重启os。 [oracle@oraclerac1 ~]$ more /etc/hosts #127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 #::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.10.180 oraclerac1 192.168.10.181 oraclerac2
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