1、检查无效的数据库对象：

SELECT owner, object_name, object_type,status 

FROM dba_objects 

WHERE status = 'INVALID'; 


2、检查不起作用的约束：

SELECT owner, constraint_name, table_name, constraint_type, status

FROM dba_constraints

WHERE status = 'DISABLED';


3、检查无效的触发器：

SELECT owner, trigger_name, table_name, status

FROM dba_triggers

WHERE status = 'DISABLED'; 


4、检查失效的索引：

select index_name,table_name,tablespace_name,status

 From dba_indexes 

Where status<>'VALID';