Oracle with SYS login Ora-28009:connection as SYS should be as SYSDBA OR Sysoper workaround

Case one: Login with Sqlplus

Normal input username password, will be error, because SYS is a super administrator outside the database, so when we log in

To enter a password: password +as sysdba (for example: 123456 as SYSDBA)
Scenario two: Log on with PL/SQL

This is our usual login database is very normal operation, but with the SYS as a user name when logged in will be reported
Ora-28009:connection as SYS should be as SYSDBA OR sysoper such an error
The workaround is to:

Change the "Connect as" option box to SYSDBA or Sysoper to log on successfully

Http://blog.sina.com.cn/s/blog_81257318010145bl.html

Oracle with SYS login Ora-28009:connection as SYS should be as SYSDBA OR Sysoper workaround