解決Oracle启动监听时错误 一、TNS-12547： TNS-12547: TNS:lost contactTNS-12560: TNS:protocol adapter errorTNS-00517: Lost
解決Oracle启动监听时错误
一、TNS-12547：
TNS-12547: TNS:lost contact
TNS-12560: TNS:protocol adapter error
TNS-00517: Lost contact
Linux Error: 104: Connection reset by peer
发现/etc/hosts中并没有127.0.0.1 localhost.
修改/etc/hosts,修改后如下
$ cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost
二、TNS-12555：
TNS-12555: TNS:permission denied
TNS-12560: TNS:protocol adapter error
TNS-00525: Insufficient privilege for operation
Linux Error: 1: Operation not permitted
解决如下：
# chmod 777 /var/tmp/.oracle
原因分析：Oracle卸载不干净，导致/var/tmp/.oracle目录权限不足，故而报错。
相关阅读：
Oracle之TNS-04415错误
Oracle 10g RAC监听报TNS-12545 TNS-12560 TNS-00515
Oracle 11gR2 RAC TNS-12542: TNS:address already in use 故障一例
TORA-12154 和 TNS-03505:无法解析名称
遭遇TNS-01150: The address of the specified listener name is incorrect
