PL/SQL程序包点击'Test'单步调试，点击'Start debugger'时，弹出信息框"Debugging requires Debug connect session system priviledges'。
此时需要用sys/system用户赋予开发用户debugger权限：
grant debug any procedure to username
grant debug connect session to username
PL/SQL程序包点击'Test'单步调试，点击'Start debugger'时，弹出信息框"Debugging requires Debug connect session system priviledges'。
此时需要用sys/system用户赋予开发用户debugger权限：
grant debug any procedure to username
grant debug connect session to username