oracle用户界面登陆
用户要切换到oracle
sqlplus / as sysdba //sys用户是oracle的最高管理员所以要加上as
help index //查看命令列表，sql中不区分大写小写
show user //查看当前用户
quit //退出SQL创建数据库
[oracle@Oracle ~]$ dbca //会自动跳转出，如果不弹窗口执行: export DISPLAY=:0.0
如提示：No protocol specified，则输入
xhost local:oracle non-network local connections being added to access control list
敲回车运行后出现：
non-network local connections being added to access control list
xhost: bad hostname "non-network"
xhost: bad hostname "local"
xhost: bad hostname "connections"
xhost: bad hostname "being"
xhost: bad hostname "added"
xhost: bad hostname "to"
xhost: bad hostname "access"
xhost: bad hostname "control"
xhost: bad hostname "list"
此时再 输入 dbca ,即可弹出图形界面