oracle 9i提供了dbms_redefinition包來實現數據庫的表的在線重定義功能。在實際的應用上，我們可以利用這個包來進行：

(1)堆表與分區之間進行轉換。(2)重建表以減少HWM。10g能shrink，9i如果用move tablespace and rebuild index在move的時候會鎖表，如果想實現在線降低HWM，只能用這個了。

(3)在線更改表結構，如更改列的前后順序，將column_a，column_b改成column_b，column_a

1.創建測試表

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.創建分區表

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)

;

-- 打開重定義

begin

dbms_redefinition.CAN_REDEF_TABLE('boc_rdm','REBUILD_TABLE');

end;

-- 開始重定義

begin

dbms_redefinition.START_REDEF_TABLE('boc_rdm','REBUILD_TABLE','REBUILD_PA_TABLE');

end;

-- 進行數據同步

begin

dbms_redefinition.sync_interim_table('BOC_RDM','REBUILD_TABLE','REBUILD_PA_TABLE');

end;

-- 重命名表，把非分區表轉化為分區表

begin

dbms_redefinition.finish_redef_table('BOC_RDM','REBUILD_TABLE','REBUILD_PA_TABLE');

end;

select * from REBUILD_TABLE partition(p20111031)

總結

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