oracle connection appears pit

A. Error code hints

　　Please enter your user name: SYS
　　password:
　　ERROR:
　　ORA-28009: Connection Should BE AS SYS AS SYSDBA or SYSOPER

II. Solution

　　Because SYS super administrator outside of the database, so when we log in to enter the password: password + as sysdba (for example: tp as sysdba)