demo14.sql

VC++是微软公司开发的一个IDE(集成开发环境),换句话说,就是使用c++的一个开发平台.有些软件就是这个编出来的

create table t
( OWNER, OBJECT_NAME, SUBOBJECT_NAME, OBJECT_ID, DATA_OBJECT_ID,
  OBJECT_TYPE, CREATED, LAST_DDL_TIME, TIMESTAMP, STATUS,
  TEMPORARY, GENERATED, SECONDARY )
partition by hash(object_id)
partitions 16
as
select * from all_objects;
create index t_idx
on t(owner,object_type,object_name)
LOCAL
/
begin
        dbms_stats.gather_table_stats
        ( user, 'T', cascade=>true);
end;
/


variable o varchar2(30)
variable t varchar2(30)
variable n varchar2(30)

exec :o := 'SCOTT'; :t := 'TABLE'; :n := 'EMP';

select *
  from t
 where owner = :o
   and object_type = :t
   and object_name = :n
/
select *
  from t
 where owner = :o
   and object_type = :t
/
select *
  from t
 where owner = :o
/


drop index t_idx;


create index t_idx
on t(owner,object_type,object_name)
global
partition by hash(owner)
partitions 16
/


variable o varchar2(30)
variable t varchar2(30)
variable n varchar2(30)

exec :o := 'SCOTT'; :t := 'TABLE'; :n := 'EMP';

select *
  from t
 where owner = :o
   and object_type = :t
   and object_name = :n
/
select *
  from t
 where owner = :o
   and object_type = :t
/
select *
  from t
 where owner = :o
/