Oracle查询优化-05元数据查询

select * from all_tables ;
select * from dba_tables ;
select * from user_tables ;

select * from all_tab_columns a ;
select * from dba_tab_columns a ;
select * from user_tab_columns a ;

select a.*from all_ind_columns a ;
select a.* from dba_ind_columns a ;
select a.* from user_ind_columns a 

select a.TABLE_NAME, a.CONSTRAINT_NAME, b.COLUMN_NAME, a.CONSTRAINT_TYPE
  from all_constraints a, all_cons_columns b
 where a.TABLE_NAME = 'EMP'
   and a.OWNER = b.OWNER
   and a.TABLE_NAME = b.TABLE_NAME
   and a.CONSTRAINT_NAME = b.CONSTRAINT_NAME;


TABLE_NAME       CONSTRAINT_NAME COLUMN_NAME                                                   CONSTRAINT_TYPE
------------------------------ ------------------------------ -------------------------------------------------------------------------------- ---------------
EMP                       FK_DEPTNO          DEPTNO                                                                  R
EMP                       PK_EMP                 EMPNO                                                                   P

select 
       a.TABLE_NAME, 
       a.CONSTRAINT_NAME, 
       a.COLUMN_NAME,
       c.INDEX_NAME
  from all_cons_columns a, all_constraints b, all_ind_columns c
 where a.TABLE_NAME = 'EMP'
   and a.OWNER = 'CRM'
   and b.CONSTRAINT_TYPE = 'R'
   and a.OWNER = b.OWNER
   and a.TABLE_NAME = b.TABLE_NAME
   and a.CONSTRAINT_NAME = b.CONSTRAINT_NAME
   and a.OWNER = c.TABLE_OWNER(+)
   and a.TABLE_NAME = c.TABLE_NAME(+)
   and a.COLUMN_NAME = c.COLUMN_NAME(+)
   and c.INDEX_NAME is null;


TABLE_NAME       CONSTRAINT_NAME COLUMN_NAME                                                   INDEX_NAME
------------------------------ ------------------------------ -------------------------------------------------------------------------------- ------------------------------
EMP                       FK_DEPTNO          DEPTNO                   

select 'select count(1) from ' || table_name || ';' from user_tables ; 

   select * from dictionary  a order by a.TABLE_NAME ;

   select * from dict_columns a where a.TABLE_NAME = 'V$SQL';