Home >Database >Mysql Tutorial >Oracle 普通表与分区表转换

Oracle 普通表与分区表转换

WBOY
WBOYOriginal
2016-06-07 17:15:271220browse

oracle 9i提供了dbms_redefinition包来实现数据库的表的在线重定义功能。在实际的应用上,我们可以利用这个包来进行:(1)堆表与

Oracle 9i提供了dbms_redefinition包来实现数据库的表的在线重定义功能。在实际的应用上,我们可以利用这个包来进行:
(1)堆表与分区之间进行转换。(2)重建表以减少HWM。10g能shrink,9i如果用move tablespace and rebuild index在move的时候会锁表,如果想实现在线降低HWM,只能用这个了。
(3)在线更改表结构,,如更改列的前后顺序,将column_a,column_b改成column_b,column_a
1.创建测试表
create table rebuild_table as select * from dba_objects;
insert into rebuild_table select * from rebuild_table;
insert into rebuild_table select * from rebuild_table;
insert into rebuild_table select * from rebuild_table;
commit;
delete from rebuild_table;
insert into rebuild_table select * from dba_objects;
insert into rebuild_table select * from rebuild_table;
insert into rebuild_table select * from rebuild_table;
commit;
update rebuild_table set object_id=rownum;
alter  table rebuild_table add CONSTRAINT P_YY PRIMARY KEY (OBJECT_ID);
select * from rebuild_table;
2.创建分区表
create table REBUILD_PA_TABLE
(
  STATIS_DATE    NUMBER(8),
  OWNER          VARCHAR2(30),
  OBJECT_NAME    VARCHAR2(128),
  SUBOBJECT_NAME VARCHAR2(30),
  OBJECT_ID      NUMBER not null,
  DATA_OBJECT_ID NUMBER,
  OBJECT_TYPE    VARCHAR2(18),
  CREATED        DATE,
  LAST_DDL_TIME  DATE,
  TIMESTAMP      VARCHAR2(19),
  STATUS         VARCHAR2(7),
  TEMPORARY      VARCHAR2(1),
  GENERATED      VARCHAR2(1),
  SECONDARY      VARCHAR2(1)
)
partition by  list (STATIS_DATE)
(
partition p20111031 values (20111031)
);
alter table REBUILD_PA_TABLE add partition p20111101 values(20111101);
;
alter table REBUILD_PA_TABLE
  add constraint Pa_YYY primary key (OBJECT_ID)
;
-- 打开重定义
begin
dbms_redefinition.CAN_REDEF_TABLE('boc_rdm','REBUILD_TABLE');
end;
-- 开始重定义
begin
dbms_redefinition.START_REDEF_TABLE('boc_rdm','REBUILD_TABLE','REBUILD_PA_TABLE');
end;
-- 进行数据同步
begin
dbms_redefinition.sync_interim_table('BOC_RDM','REBUILD_TABLE','REBUILD_PA_TABLE');
end;
-- 重命名表,把非分区表转化为分区表
begin
dbms_redefinition.finish_redef_table('BOC_RDM','REBUILD_TABLE','REBUILD_PA_TABLE');
end;
select * from REBUILD_TABLE partition(p20111031)

linux

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn