Oracle 闪回触发器的bug

做了一个测试。SQL> create table test1 (cola varchar2(10) );表已创建。SQL> create table test2 (colb varchar2(10));表已创建。SQL> select * from test1;未选定行SQL> select * from test2;未选定行SQL> create or replace trigger trigger1
  2    before insert on test1
  3    for each row
  4  declare
  5  begin
  6    insert into test2(colb) values('trigger1');
  7  end trigger1;
  8  /触发器已创建SQL> select object_name,object_id from user_objects where object_name in ('TRIGGER1','TEST1');OBJECT_NAME                                                                    
--------------------------------------------------------------------------------
 OBJECT_ID                                                                     
----------                                                                     
TEST1                                                                          
    101621                                                                     
                                                                               
TRIGGER1                                                                       
    101623                                                                     
                                                                                SQL> col object_name for a20
SQL> /OBJECT_NAME           OBJECT_ID                                                
-------------------- ----------                                                
TEST1                    101621                                                
TRIGGER1                 101623                                                 SQL> insert into test1(cola) values('no1');已创建 1 行。SQL> commit;提交完成。SQL> select * from test1;COLA                                                                           
--------------------                                                           
no1                                                                             SQL> select * from test2;COLB                                                                           
--------------------                                                           
trigger1                                                                        --到这里，表现一切正常。下面开始删除恢复。SQL> drop table test1;表已删除。SQL> select object_name,object_id from user_objects
  2  where object_name in ('TRIGGER1','TEST1');未选定行--如果没加purge选项，则两者都被删除到回收站，虽然user_object视图看不到，在底层表obj$中能看到。
SQL> flashback table TEST1 to before drop;闪回完成。SQL> select object_name,object_id from user_objects
  2  where object_name in ('TRIGGER1','TEST1');OBJECT_NAME           OBJECT_ID                                                
-------------------- ----------                                                
TEST1                    101621                                                 --闪回成功后，www.linuxidc.com在视图中，正常对象只能看到表TEST1，不能看到触发器。SQL> grant select on obj$ to ncoadev;授权成功。--切换到sys用户，授权访问指定对象。SQL> select name,obj# from sys.obj$ where obj# in (101621,101623);NAME                                                               OBJ#        
------------------------------------------------------------ ----------        
TEST1                                                            101621        
BIN$mlTKEo1FAGjgQ38AAAEAaA==$0                                   101623         --obj$表中，能看到 ID为101623的触发器还在，但名字被Oracle打了内部标记。此时，用pl/sql dev等工具是看不到那个触发器的。SQL> select * from test2;COLB                                                                           
--------------------                                                           
trigger1                                                                        SQL> insert into test1(cola) values('no2');已创建 1 行。SQL> commit;提交完成。SQL> select * from test2;COLB                                                                           
--------------------                                                           
trigger1                                                                       
trigger1     --又插入了一条记录，证明触发器还是生效的，但很难管理了。更麻烦的是后面：SQL> create or replace trigger trigger1
  2    before insert on test1
  3    for each row
  4  declare
  5  begin
  6    insert into test2(colb) values('trigger2');
  7  end trigger1;
  8  /触发器已创建--如果开发人员看不到触发器了，认为触发器丢失，又建立了一个新的同名触发器trigger1，仍然能建立。SQL> select * from test2;COLB                                                                           
--------------------                                                           
trigger1                                                                       
trigger1                                                                        SQL> insert into test1(cola) values('no3');已创建 1 行。SQL> commit;提交完成。SQL> select * from test2;COLB                                                                           
--------------------                                                           
trigger1                                                                       
trigger1                                                                       
trigger2                                                                       
trigger1     --此时，两个触发器都生效了，都作用在这个表上，会给系统带来什么影响呢？？    这算不算一个bug呢？