远程连接centos7中的oracle12c

1、切换到root用户并关闭centos7的防火墙

$su - root

#systemctl stop firewalld.service

2、切换oracle用户启动监听

#su - oracle

$lsnrctl start

3.登录sqlplus

$sqlplus /nolog

4.切换sys账户并启动oracle

sql>conn / as sysdba

sql>startup

5、登出并重新并登录是使用账号密码重新登录

sql>exit;

$sqlplus 账号/密码@数据库

如果未执行步骤4 则会报 ORA-12514: TNS:listener does not currently know of service requested in connect