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

   今天做实验，忘记切换用户,在sys下建立触发器时发现了ORA-04089，不能建立trigger在sys的对象上
SQL> conn / as sysdba
Connected.
SQL> create table test_tr(id number,name varchar2(10));
Table created.
SQL> create or replace trigger tri_test_tr
2  before insert
3  on test_tr
4  for each row
5  begin
6  if :new.id >1000 then
7  :new.id :=-1;
8  end if;
9  end;
10  /
create or replace trigger tri_test_tr
*
ERROR at line 1:
ORA-04089: cannot create triggers on objects owned by SYS
SQL> create table anbob.test_tr1 as select * from test_tr;
Table created.
SQL> l
1  create or replace trigger tri_test_tr1
2      before insert
3      on anbob.test_tr1
4      for each row
5      begin
6      if :new.id >1000 then
7      :new.id :=-1
8  ;
9      end if;
10*    end;
SQL> run
1  create or replace trigger tri_test_tr1
2      before insert
3      on anbob.test_tr1
4      for each row
5      begin
6      if :new.id >1000 then
7      :new.id :=-1
8  ;
9      end if;
10*    end;

Trigger created.
总结:
不可以在sys的对象上创建trigger,业务上的对象一定要保存其它的用户下，oracle是出于什么原因，在网上也没找到，绝的sys就像os 里的root,它用最高的权限。我觉得应该出于安全的角度。
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.