步骤
1.netca ，add ，一路下去，就ok 了，默认1521 ，
如果这步他提示监听端口已经被占用，那么把 $oracle_home/network/admin下面的 listener.ora，给删了，动态监听不需要自己配置
默认
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
host 是主机名，比如说我的vps3，那么要在/etc/hosts下绑定一下
127.0.0.1 vps3
不然会出现莫名的ip ，你就永远也得不到正确的监听了。。这步很重要。
2.database startup ，pmon 会自动监听的，lscnctl status 会
Service "testdb" has 1 instance(s).
Instance "testdb", status READY, has 1 handler(s) for this service...
Service "testdbXDB" has 1 instance(s).
Instance "testdb", status READY, has 1 handler(s) for this service...
The command completed successfully