Oracle在线重定义DBMS_REDEFINITION 普通表—>分区表

实验环境：RHEL 6.4 + Oracle 11.2.0.3
实验：在线重定义 普通表 为 分区表，包括主键对应的索引都改造为分区索引.

1,构造普通表t_objects

conn test1/test1;
create table t_objects as select * from dba_objects;
SQL> select count(1) from t_objects;

  COUNT(1)
----------
    468738

--t_objects建立主键和索引
alter table t_objects add constraint pk_objects primary key (created, object_id);
create index i_objects on t_objects(object_id, STATUS);

--表有主键，确认表可以重定义：
SQL> EXEC DBMS_REDEFINITION.CAN_REDEF_TABLE('test1','t_objects');

PL/SQL procedure successfully completed.

--若表无主键 可以采用rowid重定义：
SQL> EXEC DBMS_REDEFINITION.CAN_REDEF_TABLE('test1','t_objects',2);

PL/SQL procedure successfully completed.

2,创建重定义需要的临时表

-- Create table
create table T_OBJECTS_TEMP
(
  OWNER          VARCHAR2(30),
  OBJECT_NAME    VARCHAR2(128),
  SUBOBJECT_NAME VARCHAR2(30),
  OBJECT_ID      NUMBER not null,
  DATA_OBJECT_ID NUMBER,
  OBJECT_TYPE    VARCHAR2(19),
  CREATED        DATE not null,
  LAST_DDL_TIME  DATE,
  TIMESTAMP      VARCHAR2(19),
  STATUS         VARCHAR2(7),
  TEMPORARY      VARCHAR2(1),
  GENERATED      VARCHAR2(1),
  SECONDARY      VARCHAR2(1),
  NAMESPACE      NUMBER,
  EDITION_NAME   VARCHAR2(30)
)partition by range(created)(
  partition P20130601 values less than (TO_DATE(' 2013-06-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    tablespace DBS_D_GRNOPHQ,
  partition P20140607 values less than (TO_DATE(' 2014-06-07 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    tablespace DBS_D_GRNOPHQ,
  partition P20140731 values less than (TO_DATE(' 2014-07-31 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    tablespace DBS_D_GRNOPHQ
);

3,开始重定义

exec DBMS_REDEFINITION.START_REDEF_TABLE('test1','t_objects','t_objects_temp');

注；若无主键不能这样重定义，需要指定以rowid重定义，示例如下：

SQL> exec DBMS_REDEFINITION.START_REDEF_TABLE('test1','t_objects','t_objects_temp',null,2);   

PL/SQL procedure successfully completed.

4,开始拷贝表的属性（本次未做，因为这样转换的，索引不是分区索引）

DECLARE
 error_count pls_integer := 0;
BEGIN
    DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS(
        uname => 'test1',
        orig_table => 't_objects',
        int_table => 't_objects_temp',
        ignore_errors => TRUE,
        num_errors => error_count);
    DBMS_OUTPUT.PUT_LINE('errors := ' || TO_CHAR(error_count));
END;
/

--经实验，在开始重定义之后在临时表上创建local索引，重定义完成后，主键对应的索引也是分区索引;

alter table t_objects_temp add constraint pk_objects_temp primary key (created, object_id) using index local;
create index i_objects_temp on t_objects_temp(object_id, STATUS) local;

5,同步数据

exec DBMS_REDEFINITION.SYNC_INTERIM_TABLE (uname => 'test1',orig_table  => 't_objects',int_table  => 't_objects_temp');

6,收集中间表的统计信息(选做)

EXEC DBMS_STATS.gather_table_stats('test1', 't_objects_temp', cascade => TRUE);

7,完成重定义

exec DBMS_REDEFINITION.FINISH_REDEF_TABLE(uname => 'test1',orig_table => 't_objects',int_table => 't_objects_temp');

EXEC DBMS_REDEFINITION.FINISH_REDEF_TABLE('TEST1','T_OBJECTS','T_OBJECTS_TEMP');

8,删除临时表

drop table t_objects_temp purge;

9,修改索引，约束名称和原表一致

alter index I_OBJECTS_TEMP rename to I_OBJECTS;
alter index PK_OBJECTS_TEMP rename to PK_OBJECTS;
alter table t_objects rename constraint pk_objects_temp to pk_objects;

10,ABORT_REDEF_TABLE使用

在FINISH_REDEF_TABLE之前，可以使用abort_redef_table停止重定义

SQL> select * from cat;

TABLE_NAME                     TABLE_TYPE
------------------------------ -----------
MLOG$_T_OBJECTS                TABLE
T_OBJECTS                      TABLE
T_OBJECTS_TEMP                 TABLE

SQL> exec DBMS_REDEFINITION.ABORT_REDEF_TABLE ('test1','t_objects','t_objects_temp');

PL/SQL procedure successfully completed.

SQL> select * from cat;

TABLE_NAME                     TABLE_TYPE
------------------------------ -----------
T_OBJECTS                      TABLE
T_OBJECTS_TEMP                 TABLE