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  • Oracle大数据表的分表处理

    1.首先给大数据表创建rownum序列号

    --增加序列号字段
    alter table TEST add xlh number;
    --填充序列号
    update TEST set xlh = rownum;

    2.通过xlh字段进行分数据到不同的表中(以建表的方式进行处理)

    create table hik_1001 as select clm1 as hik_clm1,clm2 as hik_clm2,clm3 as hik_clm3 from TEST where   xlh>=1 and xlh <=5000000;
    
    create table hik_1002 as select clm1 as hik_clm1,clm2 as hik_clm2,clm3 as hik_clm3 from TEST where   xlh>=5000001 and xlh <=10000000;
    
    create table hik_1003 as select clm1 as hik_clm1,clm2 as hik_clm2,clm3 as hik_clm3 from TEST where   xlh>=10000001 and xlh <=15000000;
    
    create table hik_1004 as select clm1 as hik_clm1,clm2 as hik_clm2,clm3 as hik_clm3 from TEST where   xlh>=15000001;

    3.给创建的表分别建立主键或者索引

    create index hik_1001_index on HIK_1001  (HIK_CLM2)
    
    alter table HIK_1001  add constraint HIK_1001_PKEY primary key (HIK_CLM1)

    如果数据有重复的话,只需要建立索引就可以.

    4.然后对分表后的数据进行处理

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  • 原文地址:https://www.cnblogs.com/fxust/p/7221018.html
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