Oracle之查询索引、索引列等信息

用user_indexes和user_ind_columns系统表查看已经存在的索引

user_indexes:     系统视图存放是索引的名称以及该索引是否是唯一索引等信息。

user_ind_column:  系统视图存放的是索引名称，对应的表和列等。

完整性约束
　　DBA_CONSTRAINTS、ALL_CONSTRAINTS和USER_CONSTRAINST  显示有关约束的一般信息。
查询数据库列级的约束信息
　　DBA_CONS_COLUMNS、ALL_CONS_COLUMNS和USER_CONS_COLUMNS 显示有关列的相关约束的一般信息。

ALL_CONS_COLUMNS 视图能够显示用户可以访问的所有表上约束的列信息，而不管所有者是谁。
DBA_CONS_COLUMNS 视图列出了整个数据库的列级约束信息。
USER_CONS_COLUMNS

数据字典表列说明：

---------------------------------------------------------------------------------
desc user_constraints

Name                                                                                   Comments                                                                    

-----------------                --------------------------------------------------------------------------- 

OWNER                                                                   Owner of the table                                                          

CONSTRAINT_NAME                                             Name associated with constraint definition                                  

CONSTRAINT_TYPE                                              Type of constraint definition                                               

TABLE_NAME                                                          Name associated with table with constraint definition                       

SEARCH_CONDITION                                             Text of search condition for table check                   
c926
                 

R_OWNER                                                                 Owner of table used in referential constraint                               

R_CONSTRAINT_NAME                                          Name of unique constraint definition for referenced table                   

DELETE_RULE                                                          The delete rule for a referential constraint                                

STATUS                                                                      Enforcement status of constraint -  ENABLED or DISABLED                     

DEFERRABLE                                                           Is the constraint deferrable - DEFERRABLE or NOT DEFERRABLE                 

DEFERRED                                                                 Is the constraint deferred by default -  DEFERRED or IMMEDIATE              

VALIDATED                                                       Was this constraint system validated? -  VALIDATED or NOT VALIDATED         

GENERATED                                         Was the constraint name system generated? -  GENERATED NAME or USER NAME    

BAD                                                                        Creating this constraint should give ORA-02436.  Rewrite it before 2000 AD. 

RELY                                                                                       If set, this flag will be used in optimizer                                 

LAST_CHANGE                                                               The date when this column was last enabled or disabled                      

INDEX_OWNER                                                                The owner of the index used by the constraint                               

INDEX_NAME                                                                    The index used by the constraint                                            

INVALID                                                                                          

VIEW_RELATED      

-------------------------------------------------------------------------------------------------------------------------------------------------
desc user_cons_columns;

Name                                                                                Comments                                                                                         

--------------- -------------- -------- ------- ------------------------------------------------------------------------------------------------ 

OWNER                                                                         Owner of the constraint definition                                                               

CONSTRAINT_NAME                                               Name associated with the constraint definition                                                   

TABLE_NAME                                                        Name associated with table with constraint definition                                            

COLUMN_NAME                    Name associated with column or attribute of object column specified in the constraint definition 

POSITION                                                                      Original position of column or attribute in definition