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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 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
    



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  • 原文地址:https://www.cnblogs.com/jyzhao/p/3876634.html
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