Postgresql分区表

PostgreSQL 提供了三种分区表实现方式:

  1. range :范围分区
  2. list :列表分区
  3. hash :哈希分区

一、范围分区

根据某个字段的值,将数据存入不同的分区表中。

  1. 创建父表

    create table test_person_table
    (
        name varchar(64),
        age  int
    ) partition by range (age);
    

    根据age 字段进行范围分区

  2. 创建分区表

    create table test_person_table_r1 partition of test_person_table for values from (minvalue )to(10);
    create table test_person_table_r2 partition of test_person_table for values from (11 )to(20);
    create table test_person_table_r3 partition of test_person_table for values from (21 )to(30);
    create table test_person_table_r4 partition of test_person_table for values from (31 )to(40);
    create table test_person_table_r5 partition of test_person_table for values from (41 )to(maxvalue );
    
    • 第一个分区表,范围是从最小值到10
    • 最后一个分区表,范围是从41到最大值
    • 如果插入的数值,没有分区能够覆盖,则会报错

    父表和分区表都创建成功:

    Postgresql分区表_第1张图片

  3. 插入数据

    insert into test_person_table (name, age) values ('xiaoxiao1', 5);
    insert into test_person_table (name, age) values ('xiaoxiao2', 15);
    insert into test_person_table (name, age) values ('xiaoxiao3', 25);
    insert into test_person_table (name, age) values ('xiaoxiao4', 35);
    insert into test_person_table (name, age) values ('xiaoxiao5', 45);
    
  4. 查询数据

    • 查询父表

      Postgresql分区表_第2张图片

    • 查询分区表

      Postgresql分区表_第3张图片

二、列表分区

  1. 创建父表

    create table test_table_partition_by_list
    (
        name varchar(64),
        city varchar(64)
    )partition by list(city);
    

    按照city 字段进行分区

  2. 创建分区表

    create table test_table_partition_by_list_sichuan partition of test_table_partition_by_list for values in ('成都','绵阳');
    create table test_table_partition_by_list_guangdong partition of test_table_partition_by_list for values in ('广州', '深圳');
    create table test_table_partition_by_list_other partition of test_table_partition_by_list default ;
    

    Postgresql分区表_第4张图片

  3. 插入数据

    insert into test_table_partition_by_list (name, city) values ('xiaoxiao1', '成都');
    insert into test_table_partition_by_list (name, city) values ('xiaoxiao2', '绵阳');
    insert into test_table_partition_by_list (name, city) values ('xiaoxiao3', '广州');
    insert into test_table_partition_by_list (name, city) values ('xiaoxiao4', '深圳');
    insert into test_table_partition_by_list (name, city) values ('xiaoxiao5', '北京');
    
  4. 查询数据

    • 父表

      Postgresql分区表_第5张图片

    • 分区表

      Postgresql分区表_第6张图片

      Postgresql分区表_第7张图片

三、哈希分区

  1. 创建父表

    create table test_table_partition_by_hash(
        name varchar(64),
        city varchar(64)
    )partition by hash (city);
    

    按照cityhash值进行分区

  2. 创建分区表

    create table test_table_partition_by_hash_h1 partition of test_table_partition_by_hash for values with (modulus 3, remainder 0);
    create table test_table_partition_by_hash_h2 partition of test_table_partition_by_hash for values with (modulus 3, remainder 1);
    create table test_table_partition_by_hash_h3 partition of test_table_partition_by_hash for values with (modulus 3, remainder 2);
    

    Postgresql分区表_第8张图片

  3. 插入数据

    insert into test_table_partition_by_hash (name, city) values ('xiaoxiao1', 'chengdu');
    insert into test_table_partition_by_hash (name, city) values ('xiaoxiao2', 'chengdu');
    
    insert into test_table_partition_by_hash (name, city) values ('xiaoxiao3', 'guangzhou');
    insert into test_table_partition_by_hash (name, city) values ('xiaoxiao4', 'guangzhou');
    
    insert into test_table_partition_by_hash (name, city) values ('xiaoxiao5', 'shenzhen');
    insert into test_table_partition_by_hash (name, city) values ('xiaoxiao6', 'shanghai');
    insert into test_table_partition_by_hash (name, city) values ('xiaoxiao7', 'beijing');
    
  4. 查询数据

    查询父表

    Postgresql分区表_第9张图片

    查询子表:

    Postgresql分区表_第10张图片

你可能感兴趣的:(数据库,postgresql,数据库)