在尝试创建名为ghazal_current_bef_upd_row的触发器时：

create trigger ghazal_current_bef_upd_row

before update on ghazal_current

for each row

when (new.Rating < old.Rating)

begin

insert into ghazal_current_audit

(GhazalName,Old_Rating,New_Rating)

values

(:old.GhazalName,:old.Rating,:new.Rating);

end;

我收到以下错误：

Error report:

ORA-04089: cannot create triggers on objects owned by SYS

04089. 00000 - "cannot create triggers on objects owned by SYS"

*Cause: An attempt was made to create a trigger on an object owned by SYS.

*Action: Do not create triggers on objects owned by SYS.

名为ghazals_current和ghazal_current_audit的表都是由SYS创建的.为什么我不能在SYS创建的表上创建触发器.