转自：http://blog.itpub.net/271063/viewspace-1061279/
-- 连接数据库 创建测试用户
-- Connected to Oracle Database 12c Enterprise Edition Release 12.1.0.1.0
-- Connected as [email protected]_192.168.56.120
create user scott identified by tiger default tablespace users;
grant connect,resource to scott;
grant unlimited tablespace to scott;
-- 创建测试表
create table big_table
as
select rownum id, a.*
from all_objects a
where 1=0
/
alter table big_table nologging;
-- 添加200万测试记录
declare
l_cnt number;
l_rows number := &1;
begin
insert /*+ append */
into big_table
select rownum, a.*
from all_objects a
where rownum <= &1;
l_cnt := sql%rowcount;
commit;
while (l_cnt < l_rows)
loop
insert /*+ APPEND */ into big_table
select rownum+l_cnt,
OWNER, OBJECT_NAME, SUBOBJECT_NAME, OBJECT_ID, DATA_OBJECT_ID,
OBJECT_TYPE, CREATED, LAST_DDL_TIME, TIMESTAMP, STATUS,
TEMPORARY, GENERATED, SECONDARY, NAMESPACE, EDITION_NAME,
SHARING,EDITIONABLE,ORACLE_MAINTAINED
from big_table
where rownum <= l_rows-l_cnt;
l_cnt := l_cnt + sql%rowcount;
commit;
end loop;
end;
/
alter table big_table add constraint big_table_pk primary key(id);
exec dbms_stats.gather_table_stats( user, ‘BIG_TABLE‘, estimate_percent=> 1);
-- 查看占用磁盘空间大约280兆
SQL> select 35862*8 from dual;
35862*8
----------
286896
-- 开始使用oracle自带的分页子句，去前三条记录。
SQL> set timing on
SQL>
SQL> select id,object_name from big_table
2 order by id fetch first 3 rows only ;
ID OBJECT_NAME
---------- --------------------------------------------------------------------------------
1 ORA$BASE
2 DUAL
3 DUAL
Executed in 0.531 seconds
SQL> select id,object_name from big_table
2 order by id
3 offset 3 rows fetch next 3 rows only;
ID OBJECT_NAME
---------- --------------------------------------------------------------------------------
4 MAP_OBJECT
5 SYSTEM_PRIVILEGE_MAP
6 SYSTEM_PRIVILEGE_MAP
Executed in 0.407 seconds
SQL> select id,object_name from big_table
2 order by id
3 offset 6 rows fetch next 3 rows only;
ID OBJECT_NAME
---------- --------------------------------------------------------------------------------
7 TABLE_PRIVILEGE_MAP
8 TABLE_PRIVILEGE_MAP
9 USER_PRIVILEGE_MAP
Executed in 0.406 seconds
SQL> select id,object_name from big_table order by id
2 offset 0 rows fetch next 3 rows only;
ID OBJECT_NAME
---------- --------------------------------------------------------------------------------
1 ORA$BASE
2 DUAL
3 DUAL
Executed in 0.406 seconds
SQL>
在省厅查人时，可以使用这项技术。原来离不了rownum. IBATIS是否有适应oracle12c的设置呢？