Oracle同义词循环链问题解决

[sql] 
1、先查有没有循环的同义词：  
    select * from dba_synonyms where   
    table_owner='test' and synonym_name  
    <>table_name;没有记录  
  
    2、再查同义词没有对象的数据库对象：  
    select * from dba_synonyms where   
    table_owner='test'   
    and sysnonym_name in(select a.synonym_name from dba_synonyms a  
    where a.table_owner='test'  
    minus  
    select object_name from user_objects  
    )  
  
    3、把查询出来的结果进行查询表  
    select * from DRILL_PRESON  
    如果该同义词没有对应的对象，就会报ora_01775的错误  
  
    4、删除这个同义词：  
    drop public synonym DRILL_PRESON