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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 tablecreate 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 TABLET_OBJECTS TABLET_OBJECTS_TEMP TABLESQL> 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 TABLET_OBJECTS_TEMP TABLE
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